The research in brief

CGI Windows & Doors is a qualified but transitional option for impact rated windows. Three of seven platforms named it during the ranking stage, at an average listed rank of 3.3 and a best rank of 2. The strongest reason to consider it is documented Miami-Dade NOA and Florida Product Approval coverage on Sentinel aluminum impact products, including large- and small-missile configurations ^[43]. The main limitation is availability: independent sources report the Sentinel and Estate lines were discontinued on October 31, 2025, leaving only the Sparta line in limited production ^[12]. Buyers must confirm current production status, exact approval numbers, and dealer terms before committing.

Research Snapshot

Field	Finding
Platform mentions in ranking stage	3 of 7 platforms (DeepSeek, Kimi, Perplexity)
Share of included platform responses	42.9%
Average listed rank	3.3
Best listed rank	2
Relevant service or product	CGI Sentinel impact-rated aluminum window systems (Series 110 single-hung, Series 120 horizontal roller, Series 130 fixed, Series 238 casement/project-out) and related impact-rated doors, installed through authorized dealers
Overall use-case fit	Strong (1 platform); Good (4 platforms); Weak (1 platform); Uncertain (1 platform) - 7 platforms analyzed
Research date	2026-10-02

Why CGI Windows & Doors Qualified for This Study

Questions explored

Is CGI Windows & Doors a good choice for impact rated windows in a coastal high-wind zone?
Does CGI Windows & Doors still qualify for a 2026 impact window study if its Sentinel line was discontinued?

CGI qualified because it was named by three of seven platforms during ranking discovery and because its Sentinel line carries verifiable government approval records for impact rated windows. The Florida Building Commission lists Sentinel Series 120 aluminum horizontal roller windows as large- and small-missile impact resistant and approved for use inside and outside the High Velocity Hurricane Zone, under approval FL12734-R11 with a contract running through September 22, 2030 ^[43]. Miami-Dade NOA records separately cover Sentinel 110 single-hung and Sentinel 120 sliding configurations with HVHZ approval and small-missile impact ratings ^[45]. CGI's own certification page lists approved window and door configurations including single-hung, horizontal rolling, fixed, casement, project-out, and door products ^[2].

Qualification does not mean the brand is currently purchasable. Independent sources report that CGI Sentinel and Estate lines were discontinued as of October 31, 2025, with Sparta retained and rebranded under PGT ^[12]. That conflict is central to this review and is treated as unresolved rather than settled.

The service or product in focus

Questions explored

Which CGI Windows & Doors product line should a coastal buyer specify for impact rated windows?
Does the CGI Sentinel Series 120 meet Miami-Dade HVHZ large-missile impact requirements?

The relevant purchase is the CGI Sentinel aluminum impact thermally improved window line, sold and installed through authorized dealers rather than direct from the manufacturer ^[3]. Named configurations include Series 110 single-hung, Series 120 horizontal roller, Series 130 fixed, and Series 238 casement/project-out, plus related impact-rated doors ^[2].

Approval evidence is configuration-specific. Florida Product Approval FL12734-R11 covers Sentinel Series 120 horizontal roller windows as large- and small-missile impact resistant, approved inside and outside the HVHZ ^[43]. Miami-Dade NOA 25-0812.07 covers the Sentinel 110 aluminum single-hung window as large- and small-missile impact and HVHZ compliant ^[45]. NOA 25-0812.08 and 23-0911.06 cover Sentinel 120 sliding windows with HVHZ approval and small-missile impact resistance ^[33]. A secondary listing indicates a Series 130 fixed window large-missile approval exists ^[40].

Sentinel windows are described as using laminated impact-resistant glass 7/16 inch to 1 inch thick with a clear non-yellowing interlayer meeting Missile Class D requirements ^[25]. One company brochure states Sentinel windows pass the Large Missile Test, withstanding two impacts from a 9-pound 2x4 missile at 50 feet per second ^[6]. A separate independent review describes testing against 9-pound 2x4 impacts at 34 mph followed by 9,000 pressure cycles ^[21]. Those two figures do not match and should be reconciled with the current approval document for the exact unit.

What the AI Platforms Agreed About

Questions explored

What do AI platforms agree on about CGI Windows & Doors impact rated windows?
Is CGI Windows & Doors worth considering if the buyer needs Miami-Dade NOA documentation?

Platforms broadly agreed on three points. First, CGI holds documented impact and code approvals for coastal high-wind use. OpenAI, Perplexity, Grok, Google, and DeepSeek all cited Miami-Dade NOA or Florida Product Approval records for Sentinel configurations ^[43]. Second, CGI sells through independent dealers, so installation quality and labor warranty sit with the dealer rather than the manufacturer ^[3]. Third, public installed pricing is not published by CGI, and cost must be quoted by a dealer ^[3].

Agreement on approvals is not agreement that the product is currently available. OpenAI, DeepSeek, Perplexity, and Google described CGI as a good fit without resolving discontinuation, while Anthropic, Grok, and Kimi treated discontinuation as decisive ^[12]. Platform agreement here reflects shared source material, not verified product quality.

Where the AI Platforms Disagreed or Were Uncertain

Questions explored

Is CGI Windows & Doors still manufacturing impact rated windows in 2026?
Which CGI Windows & Doors warranty terms actually apply to a new impact window purchase?

The largest disagreement is current production status. Anthropic states Sentinel and Estate are discontinued as of October 31, 2025, with only Sparta vinyl in limited production ^[12]. Grok states the brand was discontinued October 31, 2025 by MITER Brands, with Sparta rebranded as PGT Sparta ^[27]. Kimi reports the same discontinuation with PGT service handling legacy warranty claims through a July 1, 2026 transition ^[26]. OpenAI, DeepSeek, Perplexity, and Google did not report discontinuation and described CGI as a current good fit ^[1]. This is a direct factual conflict, not a difference of opinion, and it must be resolved with CGI or an authorized dealer before purchase.

Other unresolved items: parent-company identity is described as both MITER Brands and PGT Innovations, with MITER confirmed as parent since a 2022 acquisition and PGT as a sister brand (Claude, Gemini). Whether Sparta remains in limited production or is fully discontinued is disputed ^[26]. Warranty terms conflict across sources: one describes a 20-year frame finish warranty and limited lifetime frame coverage ^[6], another describes 10-year frame and laminated-glass coverage with a limited lifetime insulating-glass warranty ^[22], and a third describes 10-year frame parts with 5-year laminated glass on Sparta ^[19]. Specific NFRC U-factor, SHGC, and ENERGY STAR data were not verified in the reviewed sources (ChatGPT, Claude, Perplexity).

Features for this home improvement need

Questions explored

Does CGI Windows & Doors offer large-missile impact rated windows for HVHZ coastal homes?
What frame materials does CGI Windows & Doors offer for impact rated windows?

Impact certification and code compliance is the strongest verified capability. Sentinel products carry Miami-Dade NOA and Florida Product Approval coverage for HVHZ applications, with both large- and small-missile configurations documented for at least some series ^[43]. Approval documents specify that installation, anchorage, anchor type, size, and spacing must follow the applicable approval, so field compliance depends on the installer ^[43].

Frame materials and product range: reviewed Sentinel approval records identify aluminum construction, with thermally improved aluminum described for salt-air exposure and wind ratings cited up to 175 mph ^[13]. CGI historically offered three lines - Sentinel (architectural aluminum), Sparta (value aluminum and vinyl), and Estate (premium aluminum) - with single-hung, sliding, casement, and fixed configurations ^[13]. A comparable current vinyl Sentinel offering was not verified (ChatGPT).

Insurance documentation: approval records provide the paperwork a coastal homeowner may need for permitting or insurer review, but no source guarantees premium reductions, and insurer acceptance varies by carrier and policy ^[1]. One source estimates 10–45% insurance cuts post-installation, but that figure has no independent validation and is not CGI-specific (Claude).

Energy performance: CGI products are described as NFRC-rated, but specific U-factor, SHGC, visible transmittance, air-leakage, and ENERGY STAR values were not confirmed for individual configurations in the reviewed sources ^[30].

Pricing, contracts, and ongoing costs

Questions explored

How much do CGI Windows & Doors impact rated windows cost installed per window?
What fees and contract terms should a buyer confirm before signing with a CGI Windows & Doors dealer?

CGI does not publish consumer pricing; the purchase is a dealer-quoted installed project ^[3]. Reported installed ranges vary by source and should be treated as rough market context, not quotes. One source lists $1,000–$2,400 installed for single-hung models and $1,400–$3,400 for sliding models ^[22]. Another lists $1,300–$2,500 for full installed replacement ^[36]. Kimi reports $1,100–$2,000 per standard window in non-HVHZ counties, with HVHZ installs running 15–25% higher, and describes CGI Sentinel as 15–25% above PGT WinGuard equivalents ^[9]. Grok cites historical estimates around $100 per square foot installed for Sentinel ^[21]. Google reports typical impact installations averaging $700–$2,875 per window including labor and materials, with labor of $150–$600 per window (Gemini).

Additional costs commonly excluded from product price include installation labor, permits and inspections, removal and disposal, delivery, trim, flashing, sealants, possible structural or masonry work, and upgrades for finish, glass, size, mullions, or screens ^[1]. Dealer-specific measurement, permit, and engineering fees are unclear (ChatGPT).

Contract terms are dealer-controlled. CGI's website terms do not establish the homeowner's dealer contract, cancellation window, deposit rules, change-order terms, or delay remedies ^[3]. Warranty remedies are generally limited to repair or replacement of covered product or parts, with labor and delivery excluded or limited ^[5]. One source states warranty registration is required within 90 days of installation or the warranty is void ^[38]. Warranty exclusions include water intrusion from wind-driven rain during high-wind events, improper installation, and damage from multiple hurricanes ^[14]. Caulking is described as homeowner maintenance, and aftermarket films, tints, paint, or harmful solvents void coverage ^[14].

Best Suited For

Questions explored

Who is CGI Windows & Doors best suited for among coastal impact window buyers?
Is CGI Windows & Doors a good fit for a Florida HVHZ home needing documented impact approvals?

CGI is best suited to Florida and other jurisdictions that accept Florida Product Approval or Miami-Dade NOA documentation, particularly HVHZ zones where strict approval paperwork is required ^[1]. It fits buyers who want aluminum impact windows in multiple operating styles and who value publicly identifiable approval documents and a residential product warranty ^[1]. Kimi adds coastal homes within roughly 1,000 feet of salt water, where aluminum frames resist corrosion better than vinyl, and architecturally demanding projects needing thin sight lines or custom shapes ^[9]. It also fits buyers with existing CGI installations seeking warranty claims or wind-mitigation verification, since existing windows remain code-compliant and approval status is tied to tested performance rather than production status ^[27].

Probably Not Best Suited For

Questions explored

Who should not choose CGI Windows & Doors for impact rated windows?
Is CGI Windows & Doors a poor fit for buyers who need fast delivery or published pricing?

Buyers needing new impact windows in 2026 should not assume CGI is available. Anthropic states new purchases are not possible because Sentinel and Estate are discontinued ^[12], and Grok rates the fit weak for new coastal purchases for the same reason ^[27]. Buyers who require published installed pricing, direct-to-consumer purchase terms, or a single national installation standard are also poor fits, because CGI sells through independent dealers with dealer-set contracts ^[3]. Buyers prioritizing vinyl frames, extensive independently verified review evidence, or clearly published whole-window energy comparisons should look elsewhere (ChatGPT, Claude). Buyers needing fast delivery are a poor fit: Kimi reports historical Sentinel lead times of 12–20 weeks, longer than PGT ^[9], and Anthropic cites 2-month waits in older reviews ^[24]. Buyers wanting transferable warranties for resale should note that Kimi describes CGI residential warranties as non-transferable on most lines ^[9].

When Another Option May Be Better

Questions explored

What is a better alternative to CGI Windows & Doors for a buyer who needs currently manufactured impact windows?
When should a coastal buyer choose PGT WinGuard instead of CGI Windows & Doors?

Another option may be better when new product is required. PGT WinGuard is described as the nearest equivalent to the discontinued CGI Sentinel, with similar aluminum and vinyl impact options, active production, and comparable NOAs ^[12]. Kimi notes PGT WinGuard has broader stock availability, shorter lead times of 8–20 weeks, and a transferable warranty with a single transfer and administrative fee ^[23]. For budget priority, Kimi cites Custom Window Systems at $850–$1,500 installed and in-stock PGT at 30–60% off retail ^[9]. For energy efficiency, vinyl alternatives such as PGT WinGuard or Eco Window Systems are described as performing better on raw U-factor than aluminum ^[9]. For broader material tiers and customization, ES Windows, Custom Window Systems, and Xtreme Windows are named as alternatives (Claude). Outside Florida, a manufacturer with broader multi-state certification coverage and a national dealer network may be a better fit ^[1]. Buyers who need a single national labor warranty and standardized installation program should also look elsewhere ^[1].

Questions to ask before choosing a provider

Questions explored

What should a buyer confirm with CGI Windows & Doors before signing an impact window contract?
Which documents should a CGI Windows & Doors dealer provide for insurance and permitting?

Confirm the exact Sentinel series, model number, glass build-up, size, design pressure, and missile classification quoted for each opening (ChatGPT). Confirm the current Florida Product Approval number and/or Miami-Dade NOA that applies to each unit and that it is valid for the buyer's jurisdiction and wind zone ^[1]. Confirm whether the product being quoted is CGI Sparta (PGT Sparta) or old CGI Sentinel inventory, and whether any remaining stock carries a valid approval through the install date plus an inspection buffer ^[26]. Confirm the current warranty terms - original CGI documents or new PGT Sparta terms - and whether the warranty is transferable ^[26]. Confirm who is responsible for installation defects, water intrusion, seal failure, glass breakage, and labor during the warranty period (ChatGPT). Confirm the current U-factor, SHGC, visible transmittance, air-leakage, and ENERGY STAR details for the exact configuration (ChatGPT, Claude). Confirm the total installed price including removal, disposal, permits, structural work, trim, flashing, screens, taxes, delivery, and change-order charges (ChatGPT, Perplexity). Confirm the written lead time and remedies for manufacturing or installation delays ^[1]. Confirm the dealer is authorized and insured and can provide recent local coastal references ^[26]. Confirm the exact documents the dealer will supply to the insurer and whether the insurer has confirmed they qualify for any credit ^[11]. Confirm deposit, cancellation, financing, change-order, and dispute-resolution terms in the dealer contract (ChatGPT, Perplexity).

The consensus assessment

CGI Windows & Doors is a good, evidence-supported candidate for impact rated windows on paper, but its 2026 purchase viability is unresolved. Three of seven platforms named it in ranking, at an average rank of 3.3 and a best rank of 2. Fit ratings split: Google rated it strong, OpenAI, DeepSeek, Kimi, and Perplexity rated it good, Anthropic rated it uncertain, and Grok rated it weak. The split tracks one factual conflict - whether Sentinel and Estate were discontinued on October 31, 2025 - rather than disagreement about approval quality. Documented Miami-Dade NOA and Florida Product Approval coverage for Sentinel aluminum impact products is the strongest reason to consider CGI. The strongest reason for caution is that independent sources report the recommended Sentinel line is no longer produced for new installations, leaving only Sparta in disputed limited production. Any purchase should be contingent on written confirmation of current production status, exact approval matching for each opening, compliant installation, transparent dealer pricing, written lead-time commitments, and insurer-accepted documentation.

How This Review Was Produced

This review evaluates CGI Windows & Doors only for impact rated windows in Coastal and High-Wind Zones. It uses seven platform fit-research responses collected for the 2026 study, plus the ranking statistics from the discovery stage. Platform mentions count only platforms that named CGI during ranking discovery; all seven platforms evaluated fit. Citations are platform-reported evidence and were not independently verified by the writer stage. Company-owned sources are distinguished from independent and unclear-ownership sources in the Sources section. No personal testing, customer experience, or independent verification was performed.

Research limitations

Platform-reported research dates differ from the authoritative run date of 2026-10-02; DeepSeek reported 2026-06-01, and platform-reported dates are provenance metadata that do not independently prove freshness. The supplied URLs were collected from platform responses and were not independently validated by the writer stage. One or more fetched domains were not corroborated by brand-name or site-identity metadata and were not used as official identity signals. Company-name variants were collapsed onto one canonical brand before minimum-mentions qualification. The deterministic identity audit flagged that CGI's parent-company identity is described inconsistently across sources. Conflicting product names, pricing, and capabilities were not resolved by guessing; they are described as conflicts with verification steps. Missing research was not treated as disagreement. No-search model claims require explicit verification before being described as current facts. Public approval records establish technical approval, not installed performance at any specific home. Insurance acceptance and premium effects vary by insurer, policy, location, building characteristics, and documentation, and no guaranteed savings were verified.

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Sources

CGI Windows & Doors Review for Coastal and High-Wind Zones