CGI Home Additions & ADU: The Fort Myers Owner’s Guide
If your CGI home addition or ADU has a failing window, door, or structural component, the typical installed replacement in Fort Myers runs between $45,000 and $130,000 depending on scope, and we can usually get a crew there the same week you call. Most owners discover something’s off when they notice a door that won’t latch square, a window that’s fogged between the panes, or a hairline crack running up a corner that wasn’t there last hurricane season. CGI built a reputation in Southwest Florida for impact-rated products that stand up to what the Gulf throws at them, but even the best materials wear down, settle, or take a hit from debris.
CGI parts aren’t universal, and that’s where a lot of Fort Myers homeowners get stuck. We’re an independent contractor, not a CGI affiliate, but we’ve been matching and replacing their components across Lee County for over a decade. Derek Hollenbeck and our team know which series share hardware and which don’t, and we’ll tell you straight if an aftermarket equivalent makes sense or if you’re better off staying OEM for the warranty alignment.
Which CGI Models This Applies To
CGI’s residential lineup spans a few distinct series, and parts compatibility depends heavily on which one you have. The most common in Fort Myers homes are the Estate Collection, Targa, and Sentinel lines, each with different frame depths, glass packages, and hardware sets. The quickest way to identify what you need is to check the label etched into the corner of the glass or the sticker inside the frame track. It’ll show the model number, glass type, and manufacturing date.
Here’s what matters for compatibility: Estate and Targa series use a similar sash balance and lock mechanism, but Sentinel series moved to a heavier-duty roller assembly that doesn’t interchange with the older lines. If your addition was built after 2015, there’s a good chance it’s Sentinel. For pre-2010 CGI products still in service, OEM parts are sometimes discontinued, and we’ll source a verified equivalent that matches the original wind-load rating. That rating isn’t something to guess at in a coastal market like Fort Myers. We cross-reference the design pressure stamp on the original unit before ordering anything.
Signs Your CGI Home Additions & ADU Is Failing
- Fog or moisture between glass panes. The insulated glass unit’s seal has failed. In Fort Myers humidity, this gets worse fast - once the desiccant inside the spacer is saturated, you can’t dry it out. The glass has to be replaced, not the whole frame, if the sash is otherwise sound.
- Door or window that drags or won’t latch. This usually points to a roller or hinge assembly wearing unevenly. CGI’s heavier impact-rated sashes put real stress on hardware, and once a roller bearing starts to seize, the panel tilts and the lock strikes miss alignment.
- Visible cracking around window or door corners in drywall or stucco. This can be a settlement issue, but with a CGI addition, we also check the tie-downs and anchor straps. Some early-2000s CGI installs used connectors that are now below current code for high-wind zones - if the addition is pulling away, it’s a structural fix, not just trim work.
- Water staining on interior sill or baseboard after heavy rain. The CGI product itself may still seal, but the rough opening flashing or the perimeter caulk joint has degraded. We see this a lot on south-facing and east-facing exposures in Fort Myers, where the afternoon sun and morning storms hit hardest.
- Increased road noise or draft. Impact-rated glass should knock down sound noticeably. If you’re suddenly hearing McGregor Boulevard traffic through a window that used to be quiet, the weatherstripping has compressed or the sash isn’t seating tight against the frame, and air is bypassing the seal.
Replacement Cost & What’s Included
A full CGI home addition component replacement in Fort Myers typically lands between $45,000 and $130,000 installed, and the spread comes down to a few things: how many openings are involved, whether it’s a window-and-door refresh or a structural repair, and what series of CGI product you’re matching. A single Sentinel sliding glass door replacement with matching frame might run $3,500 to $6,500, while re-skinning an entire ADU’s window package with current-code impact units pushes toward the higher end.
Every quote we write includes the part, the labor, all disposal, and any rough-opening repair we uncover once the old unit is out. That last part matters - we don’t tack on a change order mid-job if we find rotted sheathing. The number you see on the estimate is the number you pay. Our work is covered by the 730-Day Done Right Promise, so if something isn’t right two full years later, we make it right. You can call (844) 638-7249 for a free estimate, and we’ll walk the project with you in person.
DIY or Call Us?
There’s one thing you can safely do yourself, and that’s identify the model and take photos of the problem area. Popping off an interior trim piece to check for water damage or reading a label on the glass, those are low-risk. What gives us pause is watching a homeowner try to wrestle a 150-pound CGI impact-rated sash out of its track. Those units are heavy by design - the laminated glass and reinforced frames are what earn the Miami-Dade approval, and they’ll hurt you if they come down wrong. Same caution applies to any repair that involves loosening anchor bolts or header brackets on an exterior wall; those are tied into the addition’s wind-load path, and getting the torque sequence wrong can compromise the whole assembly. If the problem is deeper than a loose screw or a popped trim nail, call us at (844) 638-7249. We’ll send a crew that knows the product, and you won’t be the one on a ladder with a pry bar in July heat.
FAQs
How long should a CGI window or door last in Fort Myers?
In this climate, a properly installed CGI impact-rated window or door holds up for 20 to 30 years before the insulated glass unit seals begin to fail. Coastal salt air accelerates corrosion on hardware, so rollers and locks on beachside additions in places like Fort Myers Beach or Sanibel may need attention closer to the 15-year mark.
Can you repair a fogged CGI window instead of replacing the whole sash?
Yes, if the frame is intact, we can replace just the insulated glass unit. The old glass is deglazed from the sash, a new IG unit matched to the original glass type and tint is set, and the sash gets re-installed. This is usually one-third to half the cost of a full sash replacement. Call (844) 638-7249 and we’ll confirm whether your specific model allows a glass-only swap.
How long does a CGI part replacement take once you start?
For a single window or door sash swap, our crew is usually on site for two to four hours and the opening is never left unsecured overnight. A multi-opening replacement across an addition or ADU typically runs two to five working days, and we coordinate so you’re not living in a construction zone longer than necessary.
Do you stock CGI parts on the truck or have to order them?
We keep common CGI hardware in our Fort Myers shop: roller assemblies, lock sets, weatherstripping, and balance springs for the Estate and Sentinel series. Full sash units and custom-sized insulated glass are ordered per job, typically with a one-to-two-week lead time. If it’s urgent, we’ll tell you what’s on hand versus what needs to be ordered, and we’ll rig a temporary seal if needed to keep your addition weathertight in the meantime.
Written by Derek Hollenbeck, Owner & General Contractor, Groundwork Construction Co. of Fort Myers, serving Fort Myers and nearby areas.