Best Flooring Contractors for Uneven and Sloping Subfloors (2026)

The research in brief

Floor Coverings International is the consensus leader for uneven subfloor flooring in this 2026 index, named by 4 of 7 platforms (57.1%) at an average listed position of 5.25. It is a one-stop franchise option for moderate unevenness, not a verified structural specialist. Handis (rank 2) is the strongest alternative for Seattle/Puget Sound buyers who need measured flatness, joist sistering, and sheathing replacement in one scope. 1 Wood Floors (rank 3) is the strongest alternative for Michigan buyers who want laser-mapped flatness and structural carpentry. The JEVN Group (rank 4) suits Raleigh/Triangle projects. Covalt Leveling (rank 7) and Five Star Floors Leveling (rank 8) are concrete-slab specialists, not wood-framing contractors. Seven platforms were studied: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. The principal limitation: one standardized prompt was sent once per platform, company-owned citations outnumber independent ones, and several official sites failed retrieval, so capability claims remain unverified.

Research Snapshot

• Topic: Best flooring contractors for uneven and sloping subfloors (uneven subfloor flooring).
• Target buyer: An owner of an older property whose floors are visibly out of level and need levelling compound or re-sheeting before any finish.
• Platforms included (7): ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, Gemini.
• Research date: 2026-10-03 (authoritative run date).
• Unique entities named: 40.
• Qualifying entities: 8.
• Eligibility rule: Named by at least two platforms during ranking discovery.
• Ranking unit: Flooring retailer, manufacturer, or installation contractor.
• Geography: United States.

Platform mentions count only ranking-discovery mentions. All included platforms evaluated fit, but a platform that assessed an entity without naming it during ranking discovery does not add to its mention count.

The Consensus Ranking

Questions explored

• What are the best flooring installation companies for uneven subfloor flooring in 2026?
• Which uneven-subfloor contractors were named by the most AI platforms?

Which provider fits your needs?

Questions explored

• Which flooring contractor should a buyer choose for uneven subfloor flooring if they need structural joist repair rather than surface leveling?
• Which uneven-subfloor contractor is best for a concrete slab, and which is best for a wood-framed floor?
• Is a national franchise or a regional specialist better for a visibly sloping older-property floor?

1. Floor Coverings International

Questions explored

• Is Floor Coverings International worth it for uneven subfloor flooring, and what are its main drawbacks?
• Does Floor Coverings International perform joist repair and re-sheeting, or only surface leveling?

Verdict. Floor Coverings International is the consensus leader by mention count, not by verified technical specialization. It is a shop-at-home franchise network that lists subfloor inspection and repair, underlayment, moisture barriers, removal of old flooring, trim work, and cleanup among installation components ^[40]. Every platform that assessed it rated the fit "mixed" except Kimi, which rated it "uncertain." It is a reasonable one-stop option when the local franchise can document leveling competence in writing, and a poor choice for severe slope, settlement, joist deflection, or widespread sheathing failure.

Why it ranked here. It was named by 4 of 7 platforms (ChatGPT, Claude, DeepSeek, Perplexity) at an average listed position of 5.25, with a best position of 1. Its mention lead comes from brand recognition and geographic breadth rather than from a verified national leveling specification.

Best suited for. Homeowners who want one local provider to inspect the subfloor, remove existing flooring, perform ordinary preparation or repair, and install a broad range of finish flooring. It also suits projects where the local franchise can provide a written leveling plan, measured tolerances, and a named qualified subcontractor or underlayment installer, and moderate unevenness addressable with localized repairs or approved self-leveling underlayment rather than structural correction.

Main strengths for the use case. Published installation scope includes subfloor inspection and repair, underlayment, moisture barriers, removal, trim, and cleanup ^[40]. Broad finish-material range across carpet, hardwood, laminate, vinyl, and tile supports matching a finish to a newly leveled substrate. A company prep guide states the subfloor should be within 3/16 inch over a 10-foot radius for safe new flooring, and describes grinding high spots and using self-leveling underlayment for concrete dips or waves ^[30]. Multiple location pages state crews test moisture and include leveling or preparation before installation ^[33]. Google-reported evidence describes self-leveling underlayment use, buffing and sanding of dry compound, and a stated 3/16-inch-over-10-feet target ^[72]. ConsumerAffairs reports at least a one-year installation and workmanship warranty at all locations, with extended warranties at selected locations ^[146].

Main limitations. No reviewed FCI material verifies a network-wide self-leveling-compound service, specified product, installer qualification, or maximum pour depth ^[40]. The reviewed guide does not specify straightedge methods, allowable flatness tolerances, elevation mapping, or moisture-test standards ^[40]. Joist sistering, structural correction, and full re-sheeting are not established as standard network services ^[39]. Each business is independently owned and operated, so crews, subcontractors, technical methods, pricing, and warranty response vary by location ^[31]. Review evidence is mixed: ConsumerAffairs reports a small sample with a 4.1 rating, Trustpilot shows a small and substantially more negative sample, and local pages include both highly positive and highly negative accounts ^[169]. At least three detailed complaints specifically describe poor self-leveling compound application and subfloor leveling failures, including tiles not level after installation with gaps at baseboards ^[145]. One customer report claims the company has been through multiple bankruptcies; this could not be independently verified ^[169].

Pricing or cost summary. No national price for uneven-subfloor remediation was verified. FCI advertises a down-to-the-penny quote after an in-home consultation and presents material and installation costs together ^[40]. One Las Vegas location reported typical job costs of $500–$15,000 depending on scope ^[146].

2. Handis

Questions explored

• Is Handis worth it for uneven subfloor flooring in Seattle, and what are its main drawbacks?
• Which uneven-subfloor contractor should a Puget Sound buyer choose if they need joist sistering and sheathing replacement in one scope?

Verdict. Handis is the highest-ranked entity by average listed position (1.33) and the strongest documented match to the exact buyer need, but only inside Seattle and most of the Puget Sound region. Its advertised scope directly includes self-leveling compound, shims, joist sistering, plywood and OSB replacement, straightedge checks, moisture checks, and finish-floor installation ^[48]. Five of seven platforms rated the fit good or strong; DeepSeek and Kimi rated it uncertain because the official site failed retrieval during their research passes.

Why it ranked here. Named by 3 of 7 platforms (ChatGPT, Perplexity, Kimi) at an average listed position of 1.33, with a best position of 1. Its rank reflects the specificity of its published prep scope rather than brand reach.

Best suited for. Seattle-area owners needing one contractor to diagnose and correct dips, soft spots, squeaks, or localized sagging before installing flooring. Also projects combining structural subfloor repair with self-leveler, underlayment, and a finish-floor installation, and owners who want prep, finish installation, itemized pricing, and a one-year workmanship warranty documented in one estimate.

Main strengths for the use case. States it measures floors with a straightedge and checks patched areas against finish-floor flatness targets including 3/16 inch in 10 feet for hardwood, 1/4 inch in 10 feet for LVP, and 1/8 inch in 10 feet for large-format tile ^[48]. Structural scope covers rotten plywood or OSB replacement, joist sistering, sister-and-replace work, and cut-and-patch repairs ^[51]. Preparation range includes self-leveler, shims, matched primer, underlayment, vapor barriers, plywood and OSB patches, and moisture testing, with the underlayment and manufacturer specification named on the estimate ^[48]. Anthropic-reported evidence names Ardex K 15, Mapei Ultraplan, and Henry 555 self-leveling underlayment products with substrate priming per specifications ^[48]. Documented case examples include a straightedge walk revealing a 5/8-inch dip, followed by a self-leveler pour and two sistered joists at the worst spot ^[48], and a water-damaged OSB section cut out, replaced with 3/4-inch plywood, and sealed with primer ^[48]. The company states it self-performs leveling compound, shimming, joist sistering, and sheathing replacement as core finish-carpentry scope ^[48]. A one-year project warranty covers prep workmanship such as leveler pours, sheathing replacement, joist sistering, vapor barrier, and underlayment installation, with finish-material defects assigned to the product manufacturer ^[48].

Main limitations. Service appears geographically concentrated in Seattle and the Puget Sound region, including Bellevue, Redmond, Kirkland, Issaquah, Renton, Tukwila, Burien, Federal Way, and Auburn ^[48]. Published information does not establish engineering capability for foundation settlement or whole-house structural correction ^[48]. Material brands, product technical data, pour limits, and installation methods are not consistently identified across pages ^[48]. No independently verified review profile or robust third-party customer-outcome evidence was established; the 5.0 rating with 3,200 reviews appears on Handis' own pages rather than a third-party platform ^[46]. Lead times and contractual cancellation or change-order terms are not publicly clear ^[48]. The company does not perform asbestos abatement; pre-1985 9x9 or 12x12 vinyl tile is routed to a licensed abatement contractor ^[53]. Active in-wall plumbing leaks must be addressed by a licensed plumber first ^[56].

Pricing or cost summary. Published starting prices include $800 for a small subfloor leveling job and $900 for a small subfloor repair or replacement job ^[48].

3. 1 Wood Floors

Questions explored

• Is 1 Wood Floors worth it for uneven subfloor flooring in Michigan, and what are its main drawbacks?
• Which uneven-subfloor contractor should a Metro Detroit buyer choose if they need laser-measured flatness plus structural joist repair?

Verdict. 1 Wood Floors is the most technically detailed entity in the index for wood-subfloor correction, and it is geographically limited to Michigan. Its published process covers laser and 10-foot straightedge verification, self-leveling underlayment, joist planing or sistering, mechanical grinding, hard shimming, moisture evaluation, and plywood preparation ^[4]. Google and Grok rated the fit strong; ChatGPT and Perplexity rated it good; Claude, DeepSeek, and Kimi rated it uncertain, largely because pricing, warranty, and lead time are not public.

Why it ranked here. Named by 3 of 7 platforms (Gemini, Grok, Kimi) at an average listed position of 2.00, with a best position of 1. Its rank reflects published technical specificity rather than national availability.

Best suited for. Older homes in Metro Detroit or other stated Michigan service areas with visibly uneven but potentially repairable wood subfloors. Also projects needing both structural carpentry and flooring installation rather than a flooring-only crew, and large or technically difficult corrections where self-leveling underlayment, joist work, moisture assessment, and documented flatness matter.

Main strengths for the use case. States it uses polymer-modified compounds from Schönox, Ardex, MAPEI, Bostik, and Uzin with substrate-specific primers, with standard pours from 1/8 inch to 1 inch and completed corrections up to 1.5 inches using specialized techniques ^[4]. States it uses lasers and 10-foot straightedges to verify flatness and targets 1/8 inch over 6 feet or 3/16 inch over 10 feet, presented as NWFA tolerances, and distinguishes flatness from levelness ^[4]. Published process includes removing subfloor sections to plane or sister uneven joists, plus layered plywood and wood shims for low spots ^[4]. States it evaluates joist spacing, subfloor thickness, deflection, and the added dead load from self-leveling material, and may collaborate with licensed structural engineers on complex projects ^[4]. The company identifies four NWFA certifications on its team and a Michigan residential-builder license; Houzz independently lists NWFA sand-and-finish and Ardex-related credentials, floor leveling, and flooring installation ^[156]. Google-reported evidence describes a strict 1/8-inch flatness mandate using laser-guided flatness mapping and 10-foot straight edges ^[83].

Main limitations. Service appears regional rather than nationwide, centered on Metro Detroit with extended coverage to the Ann Arbor corridor and Northern Michigan ^[4]. Most technical capabilities and performance outcomes are company claims rather than independently verified testing or inspection records ^[4]. No public service-specific pricing or standard lead time was found ^[4]. No clearly published contractor workmanship or subfloor warranty was identified on the reviewed pages ^[4]. A visibly sloping floor may reflect foundation or structural settlement that self-leveling alone cannot properly address ^[4]. Self-leveling over wood adds weight and may not be appropriate until framing capacity and substrate condition are confirmed ^[4]. Kimi reported the official website as non-functional during its research pass and found no verifiable business registration, contractor license, or BBB listing ^[1].

Pricing or cost summary. Pricing is quote-based and requires a subfloor evaluation; no verified price for Advanced SLU, joist repair, re-sheeting, moisture mitigation, furniture or appliance handling, or finish installation was published ^[4]. Houzz lists a broad typical job-cost range of $1,000–$100,000 for the business, which is not specific to uneven-subfloor work ^[156].

4. The JEVN Group

Questions explored

• Is The JEVN Group worth it for uneven subfloor flooring in Raleigh, and what are its main drawbacks?
• Which uneven-subfloor contractor should a Triangle-area buyer choose if they want a written itemized scope before authorizing subfloor work?

Verdict. The JEVN Group is a plausible fit for Raleigh/Triangle homeowners needing integrated subfloor preparation and flooring installation, and it is not a broadly verified U.S. option. It directly claims self-leveling, panel replacement, joist repair, laser measurement, and a 3/16-inch-over-10-feet target ^[77]. Perplexity rated the fit good; ChatGPT, Gemini, and Grok rated it mixed; Claude, DeepSeek, and Kimi rated it uncertain.

Why it ranked here. Named by 2 of 7 platforms (ChatGPT, Perplexity) at an average listed position of 2.00, with a best position of 1. Its rank reflects a well-specified service page rather than broad platform coverage.

Best suited for. Raleigh, Cary, Apex, Durham, and nearby North Carolina projects combining subfloor correction with LVP, engineered hardwood, or tile installation. Also projects involving soft spots, squeaks, localized dips, damaged OSB or plywood, and moderate flatness correction, and buyers who want a written, itemized scope before authorizing additional subfloor work.

Main strengths for the use case. States it laser-maps surfaces, fills low spots with self-leveling compound, grinds high spots, and targets 3/16 inch over 10 feet for tile and engineered hardwood applications ^[77]. Service description includes damaged OSB or plywood panel replacement, joist inspection, joist sistering, subfloor fastening, and plywood overlay ^[77]. Claims laser verification, moisture testing for wood substrates, concrete moisture assessment, fastening of loose sections, and preparation before flooring installation ^[77]. States that subfloor repairs, panel replacement, and leveling are quoted as separate line items in a written scope with itemized estimates ^[77]. Advertises a one-year workmanship warranty ^[77]. Google-reported evidence describes a milestone payment model where customers are not required to pay 50% upfront, with payments aligned to measurable project progress ^[73].

Main limitations. No public project prices were found, making comparison difficult before an on-site estimate ^[77]. No verified evidence of engineering assessment or major foundation or structural correction for severe whole-house slopes ^[77]. Public review evidence is small and not clearly specific to uneven-subfloor flooring; BBB independently shows two customer reviews, both for bathroom remodeling ^[140]. Warranty scope and exclusions are not sufficiently detailed publicly ^[77]. Service appears geographically limited to the North Carolina Triangle rather than the full United States ^[77]. Kimi reported service to Northeast Florida including Jacksonville, Ponte Vedra, St. Augustine, Nocatee, Fleming Island, and Orange Park ^[73], which conflicts with the Triangle-area service descriptions reported by other platforms. The company's terms page states that website content is not engineering, architectural, or code-compliance advice and that no binding contract exists until a separate written agreement is signed ^[81].

Pricing or cost summary. No public project prices were found. The company describes free consultations and written, itemized estimates with separate line items for subfloor work ^[77]. Financing is advertised as available for qualified applicants, but terms and fees are not published ^[77]. Potential additional charges for concealed damage discovered after demolition are described as separately documented and quoted ^[77]. No public cancellation, deposit, payment-schedule, or contract-termination terms were verified ^[77]. Pricing confidence is low.

Where platforms disagreed. Service geography conflicts directly: ChatGPT, Claude, Grok, Perplexity, and Gemini describe Raleigh/Triangle or North Carolina coverage ^[77], while Kimi describes Northeast Florida coverage ^[73]. Deepseek reported no address or service-area list on the cited page and could not verify geographic eligibility ^[77].

5. Carpet & Flooring Outlet

Questions explored

• Is Carpet & Flooring Outlet worth it for uneven subfloor flooring, and what are its main drawbacks?
• What should a buyer check before hiring Carpet & Flooring Outlet for a visibly sloping older-property floor?

Verdict. Carpet & Flooring Outlet is an uncertain fit and should not be selected for this use case based solely on a proposed service label. The supplied official website could not be retrieved during research, and available public evidence does not verify self-leveling compound work, joist or sheeting repair, tolerance measurement, or a workmanship warranty ^[184]. Six of seven platforms rated the fit uncertain; DeepSeek rated it mixed.

Why it ranked here. Named by 2 of 7 platforms (DeepSeek, Kimi) at an average listed position of 4.00, with a best position of 2. Its rank reflects a proposed service description rather than verified capability.

Best suited for. A buyer seeking a local flooring retailer or installer for standard finish-floor installation, subject to confirming that it will perform or subcontract the required subfloor correction. Also projects where an independent flooring or structural professional has already diagnosed the unevenness and specified the repair scope, and buyers who can verify through direct contact that the specific entity offers subfloor leveling services.

Main strengths for the use case. The proposed service category - flooring installation combined with subfloor leveling - is directionally relevant to the buyer's need ^[184]. A local flooring outlet may be useful when the project primarily involves finish-floor selection and installation after an independently specified subfloor repair ^[184]. Google-reported evidence describes a Virginia-based Southpark Carpet & Flooring Outlet that provides explicit subfloor repair services including laser-measuring flatness, applying leveling compounds, localized moisture testing, and re-sheeting damaged areas ^[71], but that evidence cannot be attributed to the evaluated entity.

Main limitations. Identity and website evidence remain unverified because the supplied official site could not be retrieved ^[184]. No verified evidence of self-leveling compound installation, concrete grinding, shimming, joist repair, re-sheeting, or structural assessment ^[184]. No verified floor-flatness or level-tolerance documentation ^[184]. No verified prices, lead times, material schedule, or workmanship and wear warranty ^[184]. Public evidence risks confusion with other similarly named flooring businesses, including Contractors Flooring Outlet in Elgin, Carpet Outlet in Palatine, Ashley Carpet & Flooring Outlet in McHenry, Illinois, and Williams Carpet & Flooring Outlet in Wilmington, North Carolina ^[138]. A BBB profile for a similarly named Contractors Flooring Outlet in Elgin reports the business is not accredited and is not rated because BBB lacks sufficient information ^[138]. The domain carpetandflooringoutlet.com is inactive and does not resolve to a single nationwide contractor ^[71].

Pricing or cost summary. No verified quote, price list, financing terms, or published rates for subfloor correction and flooring installation were located ^[184]. Potential costs for inspection, demolition and disposal, moisture remediation, grinding, patching, self-leveling compound, shimming, joist repair, plywood or OSB replacement, trim removal and replacement, furniture moving, and transitions should be assumed possible but were not verified for this company ^[184]. No verified deposit, cancellation, change-order, scheduling, acceptance, or dispute terms were located ^[184]. Pricing confidence is low.

Where platforms disagreed. Google reported the name corresponds to multiple unrelated regional businesses and that the specified domain is inactive ^[71], while DeepSeek and Kimi treated the entity as a Chicagoland-area flooring retailer-installer ^[184]. Perplexity found one result suggesting a similarly named UK retailer, which does not confirm the U.S. buyer target ^[181].

6. Denver Carpet & Flooring

Questions explored

• Is Denver Carpet & Flooring worth it for uneven subfloor flooring in Denver, and what are its main drawbacks?
• Which uneven-subfloor contractor should a Denver buyer choose if they need moderate leveling documented in writing alongside a one-stop purchase?

Verdict. Denver Carpet & Flooring is a mixed-to-good fit depending on platform. It publicly advertises floor leveling, subfloor preparation or repair, multiple finish materials, in-home consultation, and installation, but the available evidence does not verify the specific technical scope required for materially sloping floors: self-leveling-compound installation methods, joist correction, re-sheeting, tolerance measurement, or structural diagnosis ^[88]. Anthropic, Gemini, Grok, and Perplexity rated the fit good or strong; ChatGPT rated it mixed; DeepSeek and Kimi rated it uncertain.

Why it ranked here. Named by 2 of 7 platforms (Claude, Gemini) at an average listed position of 4.00, with a best position of 2. Its rank reflects a well-reviewed general flooring retailer with an advertised leveling service rather than a verified structural specialist.

Best suited for. Older-property flooring projects where leveling is limited or moderate and the company will document the preparation scope in writing. Also a one-stop flooring purchase and installation project involving carpet, luxury vinyl, hardwood, laminate, or tile, and buyers who value in-home consultation and broad finish-material selection.

Main strengths for the use case. The company lists Floor Leveling, Floor Installation, Floor Removal, and Pricing & Financing among its services ^[88]. Anthropic-reported evidence states the company explicitly offers high-quality self-leveling compound installation for uneven floors, stated to work for hardwood, laminate, vinyl, and tile flooring installations ^[90]. Google-reported evidence describes dedicated subfloor assessment and preparation to inspect for dips, cracks, or uneven surfaces, with leveling on both concrete and wood or plywood subfloors ^[90]. Perplexity-reported evidence states the company's disclaimer page says floor preparation may include cleaning, leveling, priming, and installation of self-leveling underlayment to achieve a smooth, level surface ^[91]. Houzz lists floor leveling and flooring installation services with an average 5.0 rating from 11 reviews ^[157]. Trustindex reports an aggregated 4.8 rating from 714 reviews ^[168]. Google-reported evidence cites a 4.9/5 rating based on over 500 reviews ^[151]. Grok-reported evidence cites a lifetime installation warranty and a 30-day satisfaction guarantee ^[88].

Main limitations. Self-leveling compound installation is not specifically verified in the reviewed public material; the proposed ranking-stage service should be treated as a service description requiring confirmation ^[88]. Public sources mention subfloor preparation, leveling, or repair as cost factors but do not verify that the company performs joist repair, sistering, structural reframing, or re-sheeting in-house ^[88]. No public evidence was found specifying laser-level or straightedge measurement procedures, allowable finished-floor tolerances, moisture testing, or a written subfloor assessment report ^[88]. No verified public lead-time, inspection-to-quote, material-order, or installation-scheduling commitment was identified ^[88]. The reviewed public sources do not verify a specific wear warranty, finish warranty, workmanship warranty, or warranty treatment for cracking, telegraphing, or movement after leveling ^[88]. Houzz states that installations are available only with flooring material purchased through the company ^[157]. Kimi reported no mention of FF/FL numbers, straightedge testing, or specific flatness tolerances for finish flooring compatibility ^[88].

Pricing or cost summary. Company-published guidance indicates that subfloor repairs may add approximately $1–$3 per square foot, but this is not a binding quote and may exclude structural work, extensive removal, disposal, permits, moisture remediation, or finish-material costs ^[93]. The company advertises 0% interest financing, but the displayed financing example is a 120-month loan at 12.99% APR for a minimum $5,000 purchase, subject to credit approval ^[88].

7. Covalt Leveling

Questions explored

• Is Covalt Leveling worth it for uneven subfloor flooring in Southern California, and what are its main drawbacks?
• Which uneven-subfloor contractor should a Los Angeles, Orange County, or San Diego buyer choose if they need concrete slab leveling and crack repair?

Verdict. Covalt Leveling is a concrete-slab specialist, not a flooring installer, and it is a good fit only for concrete subfloors in Los Angeles, Orange County, and San Diego County. It advertises concrete leveling, subfloor repair, concrete floor repair, resurfacing, crack repair, moisture guard, and interior slab repair for uneven or sloped concrete surfaces before new flooring is installed ^[7]. Anthropic, Gemini, Grok, and Perplexity rated the fit good or strong; ChatGPT rated it mixed; DeepSeek and Kimi rated it uncertain.

Why it ranked here. Named by 2 of 7 platforms (Claude, Perplexity) at an average listed position of 5.00, with a best position of 4. Its rank reflects concrete-specialist depth rather than broad applicability to wood-framed older homes.

Best suited for. Concrete slab preparation before tile, resilient flooring, epoxy, or other finish flooring in Los Angeles, Orange County, or San Diego County. Also projects involving significant slab cracking, roughness, slope, or moisture-related preparation issues, and buyers who want a specialist concrete-preparation contractor separate from the finish-floor installer.

Main strengths for the use case. Identifies self-leveling underlayment and floor preparation as part of its work; an independent construction trade report documented Covalt using a polymer-fortified, Portland-cement-based self-leveling underlayment on a large municipal subfloor project ^[148]. Anthropic-reported evidence states the company applies polymer-fortified, Portland cement-based self-leveling underlayment capable of being poured from feather edge to any thickness in a single pour, and offers both standard and lightweight half-weight underlayments for remodeling projects where dead loads are a consideration ^[59]. Employs a structural epoxy crack repair system for foundation, slab, and subfloor cracks ^[59]. A historical independent report says Covalt worked with facility managers and engineers during planning to identify problem areas before repair and leveling ^[148]. Yelp rating 4.8/5 with 141 reviews and Yahoo Local 4.8/5 with 136 reviews ^[111]. Holds California State Contractor License 657801 (C61, D51/D06) ^[63]. Google-reported evidence states the company uses Sika products for structural concrete repairs and self-leveling underlayment applications ^[125].

Main limitations. No public source reviewed verifies joist correction, sistering, plywood or OSB re-sheeting, or other wood-framed subfloor reconstruction; the company describes itself as a concrete floor repair specialist ^[7]. The current website does not publish measurable flatness or level tolerances, laser-survey procedures, moisture-test standards, or written acceptance criteria ^[7]. Exact current brands, thickness limits, substrate primers, reinforcement details, and product data sheets are not published ^[7]. No public price list, unit rate, minimum charge, or standard estimate formula was found ^[7]. The reviewed public materials do not state a written warranty period for leveling, crack repair, moisture treatment, or the finished floor ^[7]. Covalt states that it is not a flooring company and positions its service as concrete repair and preparation for a separate flooring installation ^[7]. One Birdeye review from 2013 alleges an application error by company president Martin Covalt involving insufficient acetone in Westcoat EC12 sealant, with no documented company response or resolution ^[120]. Company founding year and years in business vary across sources between 30, 35, and 40-plus years ^[7].

Pricing or cost summary. Pricing is quote-based and not publicly disclosed; no verified current price, per-square-foot rate, minimum charge, or bundled flooring-installation price was found ^[7]. The public website provides a request-an-estimate process but no dollar amount ^[7].

8. Five Star Floors Leveling

Questions explored

• Is Five Star Floors Leveling worth it for uneven subfloor flooring in the East Bay, and what are its main drawbacks?
• Which uneven-subfloor contractor should an Alameda or Contra Costa County buyer choose if they need cement-based self-leveling before LVP or laminate?

Verdict. Five Star Floors Leveling is a cement-based self-leveling specialist for the East Bay, and it is not a structural contractor. It advertises a cement-based self-leveling system for slanted, sagging, cracked, and sloped subfloors, with pump application, feathering, and one application to varying thicknesses ^[26]. Anthropic, Gemini, Grok, ChatGPT, and Perplexity rated the fit good; DeepSeek and Kimi rated it uncertain.

Why it ranked here. Named by 2 of 7 platforms (Claude, Perplexity) at an average listed position of 6.00, with a best position of 3. Its rank reflects a narrow cement-leveling specialty with limited independent review evidence.

Best suited for. East Bay, California projects involving sloped, cracked, sagging, or uneven concrete subfloors. Also cement-based self-leveling and surface preparation before LVP, laminate, hardwood, or carpet, and projects where the existing subfloor may be retained rather than fully removed.

Main strengths for the use case. Advertises a cement-based self-leveling system for slanted, sagging, cracked, and sloped subfloors, with pump application, feathering, and one application to varying thicknesses ^[26]. States it can smooth or level some floors without removing the existing subfloor and describes preparation for hardwood, laminate, carpet, and LVP installations ^[18]. Advertises a walkable surface after 24 hours and fast-drying technology ^[18]. Google-reported evidence states the company uses an advanced cement-based self-leveling system applied at thin levels to fill concrete cracks, smooth rough areas, and level out slopes without necessitating complete subfloor removal, and that its repair approach is typically 50% to 70% cheaper than total subfloor replacement ^[25]. Google-reported evidence also cites a localized customer rating of 4.8/5 on Google platforms in primary California locations ^[11]. The company claims more than 30 years of flooring-industry experience and says it has completed residential, commercial, bank, military, and government projects ^[12].

Main limitations. Service-area limitation to the East Bay is material for a United States-wide buyer; the official pages consistently identify Alameda and Contra Costa County and East Bay cities as the service area ^[12]. Structural joist correction and comprehensive plywood re-sheeting are not clearly established ^[26]. Specific compound manufacturer, technical data, substrate preparation protocol, and tolerances are unpublished ^[26]. Lead times, detailed pricing, change-order rules, and warranty terms are not transparent on the reviewed pages ^[26]. Positive review evidence is limited and some similarly named third-party listings may represent different businesses ^[130]. Anthropic reported no dedicated customer reviews on third-party platforms for Five Star Floors Leveling of Dublin, California, with multiple unrelated companies sharing similar names nationally ^[128]. Kimi reported the company website as inaccessible during research ^[11]. Google reported historic listings showing a "Five Star Floor Leveling" associated with an address and email in Broken Arrow, Oklahoma, while the current operational website and phone number focus on Dublin and the East Bay area of California ^[11].

Pricing or cost summary. No project-specific price schedule was found for the leveling or subfloor-repair service ^[26]. The company advertises estimates and claims repair may cost 50%–70% less than replacement, but this is an unverified company estimate rather than a guaranteed price ^[26]. A separate LVP page lists LVP materials beginning at $2.49 per square foot plus tax, with installation quoted separately; this is not a published price for leveling work ^[26].

What this study reveals

Questions explored

• What does the cross-platform AI study reveal about how uneven-subfloor flooring contractors are recommended?
• Why do AI platforms recommend national flooring franchises for uneven subfloors when regional specialists publish more technical detail?

Three patterns dominate this index. First, brand reach beats technical specificity in mention counts. Floor Coverings International was named by 4 of 7 platforms despite every fit assessment rating it mixed or uncertain, while Handis and 1 Wood Floors - both with far more detailed published prep scopes - were each named by 3 platforms. The ranking rule rewards platforms that name an entity during discovery, and national franchise names surface more often than regional specialists.

Second, the market splits cleanly into three service models. Full-service flooring retailers and franchises (Floor Coverings International, Denver Carpet & Flooring, Carpet & Flooring Outlet) bundle assessment, material selection, and installation but rarely publish tolerance standards or structural scope. Structural flooring contractors (Handis, 1 Wood Floors, The JEVN Group) publish measurement methods, joist work, and sheathing replacement but serve narrow geographies. Concrete-preparation specialists (Covalt Leveling, Five Star Floors Leveling) publish self-leveling and crack-repair depth but explicitly do not install finish flooring.

Third, the evidence base is thin on the exact buyer need. Across all eight entities, the most commonly published tolerance is 3/16 inch over 10 feet, cited by Floor Coverings International, Handis, 1 Wood Floors, and The JEVN Group. But only Handis, 1 Wood Floors, and The JEVN Group publish joist or sheathing scope, and only Handis and 1 Wood Floors publish named self-leveling product brands. Company-owned citations materially outnumber independent citations across the study, so most capability claims remain company-reported rather than independently verified.

Where the AI Platforms Agreed

Questions explored

• Where did the AI platforms agree about the best uneven-subfloor flooring contractors?
• Which uneven-subfloor capabilities did multiple platforms confirm across the ranked entities?

Platforms converged on several points. They agreed that Floor Coverings International is a mixed-fit, one-stop option rather than a verified structural specialist; ChatGPT, Claude, DeepSeek, Gemini, Grok, and Perplexity all rated it mixed, and Kimi rated it uncertain ^[40]. They agreed that Handis publishes the most specific prep scope of any entity, including straightedge measurement, self-leveler, joist sistering, and sheathing replacement ^[48]. They agreed that 1 Wood Floors publishes laser and straightedge flatness verification with NWFA tolerances and structural joist work ^[4]. They agreed that Covalt Leveling and Five Star Floors Leveling are concrete-focused specialists rather than wood-framing contractors ^[7]. They also agreed that severe slope, settlement, or foundation movement requires a structural engineer, foundation contractor, or general contractor rather than any of the eight entities as a primary contractor ^[40].

Where the AI Platforms Disagreed

Questions explored

• Where did the AI platforms disagree about uneven-subfloor flooring contractors, and what should buyers verify as a result?
• Which uneven-subfloor entities had conflicting platform ratings, and why?

Disagreements cluster in four areas. First, fit ratings diverge sharply for several entities. Handis received good or strong ratings from five platforms and uncertain ratings from DeepSeek and Kimi, both of which reported the official site as inaccessible ^[42]. 1 Wood Floors received strong ratings from Gemini and Grok, good ratings from ChatGPT and Perplexity, and uncertain ratings from Claude, DeepSeek, and Kimi ^[82]. Covalt Leveling received good or strong ratings from four platforms and uncertain ratings from DeepSeek and Kimi ^[149].

Second, warranty terms conflict. Floor Coverings International warranty length varies between one year, two years, and five years depending on the source ^[28]. Denver Carpet & Flooring warranty claims range from a lifetime installation warranty and 30-day satisfaction guarantee to no verified warranty terms at all ^[88]. Covalt Leveling claims an "industry leading warranty" and "30 years guaranteed" without documented terms ^[9].

Third, service geography conflicts. Handis is described as Washington-only by Claude and as California and Washington by Grok ^[42]. The JEVN Group is described as Raleigh/Triangle by five platforms and as Northeast Florida by Kimi ^[77]. Five Star Floors Leveling is described as East Bay-only by most platforms, with historic Oklahoma listings surfacing in google-reported evidence ^[11].

How to compare your options

Questions explored

• How should a buyer choose among the ranked uneven-subfloor flooring contractors?
• What should a buyer check before choosing a flooring contractor for a visibly out-of-level older-property floor?

Start with the cause, not the contractor. If the slope may reflect foundation settlement, failing beams, inadequate bearing, or widespread joist movement, obtain a structural engineer or foundation contractor assessment before soliciting flooring quotes; multiple entity bundles state this explicitly ^[40].

Then match the contractor type to the subfloor material. Concrete slabs in Southern California point to Covalt Leveling ^[7]; concrete slabs in the East Bay point to Five Star Floors Leveling ^[26]. Wood-framed floors in Seattle point to Handis ^[48]; wood-framed floors in Michigan point to 1 Wood Floors ^[4]; wood-framed floors in the Raleigh/Triangle area point to The JEVN Group ^[77]. For a one-stop purchase-and-install project with moderate unevenness, Floor Coverings International and Denver Carpet & Flooring are the broadest options ^[40].

Then require written verification before signing. Ask for measured flatness before and after, the exact leveling product and primer, maximum pour depth, moisture-test results, joist and sheathing scope, itemized pricing, lead time, and a written workmanship warranty that covers leveling work specifically. Every entity bundle in this index lists at least one of these items as unverified or unpublished.

Finally, treat platform recommendations as market intelligence, not proof of quality. The platforms named these entities during a single standardized prompt run, and company-owned citations outnumber independent ones across the study.

For a broader view of the category, see the flooring installation directory.

Methodology

This index used one standardized prompt sent once to each of seven included platforms: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. The authoritative run research date is 2026-10-03. Platform-reported research dates are provenance metadata and do not independently prove freshness; DeepSeek reported 2026-06-11 for Floor Coverings International, 2026-10-03 for Handis, 2026-01-15 for 1 Wood Floors, 2026-06-01 for The JEVN Group, 2026-01-15 for Carpet & Flooring Outlet, 2026-01-15 for Denver Carpet & Flooring, 2026-01-15 for Covalt Leveling, and 2026-01-15 for Five Star Floors Leveling. Anthropic reported 2025-01-10 for Denver Carpet & Flooring.

Ranking used platform mentions first, then average listed position, then best listed position. The final ranking table is the sole authority for rank, platform mentions, platform share, average rank, and best rank. Platform mentions count only ranking-discovery mentions; all included platforms evaluated fit, but a platform that assessed an entity without naming it during ranking discovery does not add to its mention count.

Eligibility required an entity to be named by at least two platforms. Forty unique entities were named; eight qualified. The ranking unit is a flooring retailer, manufacturer, or installation contractor. Company-name variants were collapsed onto one canonical brand before minimum-mentions qualification. Official-site retrieval failed for one or more mentions of Handis, Carpet & Flooring Outlet, and Five Star Floors Leveling; no failed fetch was used as a verified domain key. Identity for Handis and Carpet & Flooring Outlet used exact-name fallback, and the matching reported domain was retained for downstream research but remains unverified.

Citations are platform-reported evidence, not independently verified facts. The supplied URLs were collected from platform responses and were not independently validated by the writer stage. Company-owned citations materially outnumber independent citations across the study, so company claims should not be described as independently verified. No-search model claims require explicit verification before being described as current facts.

Research limitations

AI answers can vary by date, wording, location, account state, model, interface, browsing configuration, and the sources retrieved. A single standardized prompt sent once per platform captures one snapshot and cannot represent the full range of answers a buyer might see.

Platform-reported research dates differ from the authoritative run date, and those dates are provenance metadata rather than proof of freshness. Deepseek reported dates ranging from 2026-01-15 to 2026-10-03 across entities, and Claude reported 2025-01-10 for Denver Carpet & Flooring.

Official-site retrieval failed for Handis, Carpet & Flooring Outlet, and Five Star Floors Leveling during at least one platform's research pass, and identity for Handis and Carpet & Flooring Outlet relied on exact-name fallback with unverified domain association. Carpet & Flooring Outlet's supplied domain is inactive and the name corresponds to multiple unrelated regional businesses.

Company-owned citations materially outnumber independent citations for every ranked entity. The evidence gate counts 44 citations for Floor Coverings International (24 owned, 20 independent), 22 for Handis (20 owned, 2 independent), 25 for 1 Wood Floors (16 owned, 9 independent), 13 for The JEVN Group (9 owned, 4 independent), 19 for Carpet & Flooring Outlet (7 owned, 11 independent, 1 unclear), 20 for Denver Carpet & Flooring (10 owned, 10 independent), 24 for Covalt Leveling (8 owned, 15 independent, 1 unclear), and 31 for Five Star Floors Leveling (19 owned, 11 independent, 1 unclear).

Platform recommendations are market intelligence, not independent customer reviews or proof of quality. Review evidence cited in this index is platform-reported and includes small, mixed, and location-specific samples. Conflicting product names, pricing, capabilities, and service geographies were described rather than resolved.

The consensus assessment

Floor Coverings International leads this index by platform mentions (4 of 7, 57.1%) but is a mixed-fit, one-stop option rather than a verified structural specialist. Handis is the strongest documented match to the exact buyer need - measured flatness, self-leveler, joist sistering, and sheathing replacement in one scope - but only inside Seattle and the Puget Sound region. 1 Wood Floors is the strongest technical option for Michigan wood-subfloor correction, with laser and straightedge verification and NWFA credentials, but no public pricing or warranty. The JEVN Group suits Raleigh/Triangle projects with a written itemized scope. Carpet & Flooring Outlet is unverified and should not be selected on a service label alone. Denver Carpet & Flooring is credible for moderate leveling alongside a one-stop purchase. Covalt Leveling and Five Star Floors Leveling are concrete-slab specialists, not wood-framing contractors. For severe slope, settlement, or suspected foundation movement, none of the eight should be the primary contractor; obtain a structural engineer or foundation assessment first.

Frequently Asked Questions

Which company is best for uneven subfloor flooring in 2026? Floor Coverings International ranked first by platform mentions (4 of 7, 57.1%), but every fit assessment rated it mixed or uncertain. Handis ranked second with the highest average listed position (1.33) and the most specific published prep scope, but serves only Seattle and the Puget Sound region.

Does Floor Coverings International perform joist repair and re-sheeting? No reviewed FCI material establishes joist sistering, structural correction, or full re-sheeting as standard network services. Structural slope correction should be treated as location-specific and separately scoped.

Is Handis available outside Seattle? Handis' flooring pages identify Seattle and most of the Puget Sound region, including Bellevue, Redmond, Kirkland, Issaquah, Renton, Tukwila, Burien, Federal Way, and Auburn. Grok-reported evidence also cites California service, but Claude reported the flooring division operates only in Washington state.

Which entity publishes the most detailed flatness tolerances? Handis publishes 3/16 inch in 10 feet for hardwood, 1/4 inch in 10 feet for LVP, and 1/8 inch in 10 feet for large-format tile. 1 Wood Floors publishes 1/8 inch over 6 feet or 3/16 inch over 10 feet. The JEVN Group publishes 3/16 inch over 10 feet for tile and engineered hardwood.

Can Covalt Leveling or Five Star Floors Leveling repair wood joists? Neither is verified for joist correction or wood re-sheeting. Covalt describes itself as a concrete floor repair specialist, and Five Star Floors Leveling focuses on cement-based surface leveling.

How many platforms were studied? Seven: ChatGPT, Claude, DeepSeek, Grok, Perplexity, Kimi, and Gemini. One standardized prompt was sent once to each.

Why do some entities have uncertain fit ratings? Deepseek and Kimi rated Handis, 1 Wood Floors, Carpet & Flooring Outlet, Covalt Leveling, and Five Star Floors Leveling uncertain because official sites failed retrieval or no independent reviews, pricing, warranties, or licensing records could be verified.

Sources used in this study

Company-Owned Sources

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3. Hardwood Floor Installation: https://1woodfloors.com/installation
4. Subfloor Repair & Leveling | Self-Leveling Underlayment: https://1woodfloors.com/subfloor-leveling
5. Official pricing and terms source: https://1woodfloors.com/terms-of-service
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15. Cement Self-Leveling System - Five Star Floors: https://fivestarfloorsleveling.com/cement-self-leveling-system/
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125. Covalt Floor Leveling Overview and Licensing: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH1g30FsJZ8gIdcIWEPwtwPSjXBMjONoUaZ4R1CAO0UxkJAuxB1vQmfdYbtdAugh6JBHc8_jWAfSgNACNZEWCYce-qv4RnHvElpVMNQam5sJ-3KID59jjO_RDXVybU=
126. Subfloor and House Leveling Recommendations: https://vertexaisearch.cloud.google.com/grounding-api-redirect/AUZIYQH1LvAJhFEyXphdFFvuvFUv2LyrotZ4Yl-BxlAJ6qQvAp-KeIED771YLueNjWyLqYDDWV0DZI8bQVGrP_-qPgPyWgSFqGJfC_DDiuexWr3LnSUHpfCgZ-r1hNmkpAP19V6uZGn7HajUeuxrkf-GX8v-tRaNKEBPXII6jQYEY2zviJBpcKoBWnsaAns=
127. Martin Covalt Floor Leveling - Flooring - San Juan Capistrano, CA: https://verview.com/biz/9392027-martin-covalt-floor-leveling-san-juan-capistrano-california
128. Customer Review Search Results: https://www.angi.com
129. How Much Does Flooring Installation Cost in Denver, CO?: https://www.angi.com/articles/how-much-should-my-new-floor-cost/co/denver
130. Five Star Floors Inc. Reviews - Gilroy, CA: https://www.angi.com/companylist/us/ca/gilroy/five-star-floors-reviews-8535571.htm
131. COVALT FLOOR LEVELING Reviews - San Juan Capistrano, CA | Angi: https://www.angi.com/companylist/us/ca/san-juan-capistrano/covalt-floor-leveling-reviews-3758916.htm
132. Denver Carpet and Flooring Reviews - Denver, CO | Angi: https://www.angi.com/companylist/us/co/denver/denver-carpet-and-flooring-reviews-1.htm
133. Floor Coverings International of Las Vegas Reviews - Angi: https://www.angi.com/companylist/us/nv/las-vegas/floor-coverings-international-of-las-vegas-reviews-8483433.htm
134. Floor Coverings International Reviews - Angi: https://www.angi.com/companylist/us/ny/brooklyn/floor-coverings-international-reviews-14855004.htm
135. Level EZ™ - Arcat Technical Data Sheet: https://www.arcat.com/datasheets/maxxon/TDS_Maxxon_Comm_Level_EZ.pdf
136. Getting a New Hardwood Floor Level - AsktheBuilder: https://www.askthebuilder.com/getting-a-new-hardwood-floor-level/
137. Carpet Installation near Chicago, IL | Better Business Bureau: https://www.bbb.org/us/il/chicago/category/carpet-installation
138. Contractors Flooring Outlet BBB Business Profile: https://www.bbb.org/us/il/elgin/profile/new-carpet/contractors-flooring-outlet-0654-88544216
139. The JEVN Group LLC | BBB Business Profile: https://www.bbb.org/us/nc/fuquay-varina/profile/construction/the-jevn-group-llc-0593-90367512
140. The JEVN Group LLC | BBB Reviews: https://www.bbb.org/us/nc/fuquay-varina/profile/construction/the-jevn-group-llc-0593-90367512/customer-reviews
141. Best Flooring Companies in Colorado: https://www.bestpickreports.com/flooring/colorado
142. The JEVN Group - BuildZoom Contractor Profile: https://www.buildzoom.com/contractor/the-jevn-group
143. Carpet Outlet - Palatine - 13 Reviews: https://www.checkbook.org/il/palatine/carpet-stores-and-installers/carpet-outlet/x5e47
144. Floor Coverings International Homeowners Reviews - Complaints Board: https://www.complaintsboard.com/floor-coverings-international-b132793
145. Floor Coverings International Review - Complaints Board: https://www.complaintsboard.com/floor-coverings-international-do-not-hire-c474525
146. Floor Coverings International Reviews: Written By Customers: https://www.consumeraffairs.com/homeowners/floor-coverings-international.html
147. Covalt Floor Leveling - 4.22★ Concrete Contractor in San Juan Capistrano, CA: https://www.experience.com/reviews/covalt-22192842
148. Repairing and Leveling a 20-Year-Old Concrete Subfloor: https://www.forconstructionpros.com/concrete/concrete-repair/article/10878629/repairing-and-leveling-a-20yearold-concrete-subfloor
149. Repairing and Leveling a 20-Year-Old Concrete Subfloor: https://www.forconstructionpros.com/concrete/equipment-products/repair-rehabilitation-products/article/10878629/repairing-and-leveling-a-20yearold-concrete-subfloor
150. Floor Coverings International Franchise Opportunity: https://www.franchiseopportunities.com/franchise/floor-coverings-international
151. Google Maps Place Information for Denver Carpet & Flooring: https://www.google.com/maps
152. Denver Carpet & Flooring reviews on Google Maps: https://www.google.com/maps/search/Denver+Carpet+%26+Flooring
153. Web search results for Carpet & Flooring Outlet subfloor services: https://www.google.com/search?q=Carpet+%26+Flooring+Outlet+subfloor+leveling+OR+uneven+floors
154. Denver Carpet & Flooring Google Reviews: https://www.google.com/search?q=Denver+Carpet+%26+Flooring+reviews
155. Subfloor Leveler: Choose the Right Type: https://www.hfiflooring.com/articles/subfloor-leveler
156. 1WOODFLOORS.COM - Project Photos & Reviews - Livonia, MI US: https://www.houzz.com/professionals/flooring-contractors/1woodfloors-com-pfvwus-pf~1007522357
157. Denver Carpet & Flooring - Project Photos & Reviews: https://www.houzz.com/professionals/flooring-contractors/denver-carpet-and-flooring-pfvwus-pf~277989987
158. Floor Coverings International of Aurora Denver, CO - Houzz Professionals: https://www.houzz.com/professionals/flooring-contractors/floor-coverings-international-of-aurora-denver-co-pfvwus-pf~1741895480
159. Five Star Floors, 193 Leavesley Rd, Ste 160, Gilroy, CA 95020, US: https://www.mapquest.com/us/california/five-star-floors-403005337
160. AHF Products Hardwood Flooring Installation Instructions: https://www.nfm.com/on/demandware.static/-/Library-Sites-NFMSharedLibrary/default/dw4f937bbe/product-pdfs/006/85/6851556-installation-instructions.pdf
161. How to Pour Self Leveling Concrete Yourself: https://www.theartofdoingstuff.com/how-to-pour-self-levelling-cement/
162. Floor Coverings International Review - This Old House: https://www.thisoldhouse.com/flooring/floor-coverings-international-review
163. Self-Leveling Underlayment / Subfloor Preparation Guidance: https://www.thisoldhouse.com/flooring/how-to-level-a-floor
164. Floor Coverings International Review 2022 - This Old House: https://www.thisoldhouse.com/flooring/reviews/floor-coverings-international
165. Floor Coverings International | San Marcos, TX - Thumbtack: https://www.thumbtack.com/tx/san-marcos/hardwood-floor-installation/floor-coverings-international/service/521484675133390852
166. Vulkem Self-Leveling Floor Underlayment: https://www.tremcosealants.com/products/vulkem-self-leveling-floor-underlayment
167. Carpet Outlet Reviews: https://www.trustindex.io/reviews/carpetoutletusa.com
168. Denver Carpet & Flooring Reviews 2026: https://www.trustindex.io/reviews/denvercarpetandflooring.com
169. Floor Coverings International Reviews: https://www.trustpilot.com/review/floorcoveringsinternational.com
170. How to Flatten a Subfloor: https://www.woodfloorbusiness.com/installation/subfloor-prep/article/15124524/how-to-flatten-a-subfloor
171. Preparing a Subfloor for Wood Flooring: https://www.woodfloorbusiness.com/installation/subfloor-prep/article/15124547/preparing-a-subfloor-for-wood-flooring
172. A Guide to Subfloors Used Under Wood Flooring: https://www.woodfloorbusiness.com/installation/subfloor-prep/article/15124714/a-guide-to-subfloors-used-under-wood-flooring
173. Martin Covalt Floor Leveling - YP.com: https://www.yellowpages.com/nationwide/mip/martin-covalt-floor-leveling-2113504
174. 1 WOOD FLOORS - Updated July 2026: https://www.yelp.com/biz/1-wood-floors-livonia-3
175. COVALT FLOOR LEVELING - Updated September 2025: https://www.yelp.com/biz/covalt-floor-leveling-san-juan-capistrano
176. COVALT FLOOR LEVELING - Updated August 2026: https://www.yelp.com/biz/covalt-floor-leveling-san-juan-capistrano?start=80
177. Denver Carpet & Flooring Yelp Reviews: https://www.yelp.com/biz/denver-carpet-and-flooring-denver
178. 5 Star Floors - Pearland, TX: https://www.yelp.com/biz/five-star-floors-llc-pearland
179. Floor Coverings International Reviews - Yelp: https://www.yelp.com/brands/floor-coverings-international
180. Kim from Floor Coverings International Explains Subfloor Leveling on Houston Foundation: https://www.youtube.com/watch?v=FCI-Houston-Demo
181. Search results for Carpet Flooring Outlet subfloor leveling / pricing / Chicago flooring installation: https://www.ziprecruiter.com/Jobs/Carpet-Flooring/--in-Illinois
182. Five Star Floors Overview - ZoomInfo: https://www.zoominfo.com/c/five-star-floors/542330500

Other Sources

183. Customer Reviews: https://5starfloors.us/customer_reviews
184. Carpet & Flooring Outlet official website: https://carpetandflooringoutlet.com/
185. Covalt Floor Leveling | Construction: https://www.linkedin.com/company/covalt-floor-leveling