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CGI Home Additions & ADU: The Tampa Owner’s Guide
A CGI home addition or ADU in Tampa typically runs $45,000 to $130,000 for a full design-and-build, and $90,000 to $220,000 for a detached ADU with its own utility connections. Most homeowners first reach out because an existing CGI-built structure is showing wear at the tie-in points, or because they want to add square footage that matches their current CGI exterior without re-siding the whole house. We walk through what holds up, what fails first in Florida humidity, and what a realistic repair or expansion path looks like before anyone writes a deposit check.
Here’s the pattern we see in Tampa’s older neighborhoods. A homeowner has a CGI product they trust, maybe a panel system on the main house, and a bump-out or mother-in-law suite that has started pulling away at the transition flashing. Water gets behind the seam, the Florida afternoon storms do their work over two or three summers, and suddenly what looked like a cosmetic gap is a framing question. If you’re here because a specific CGI part or connection point has failed, you’re in the right place. We match materials to existing CGI components, write the price down before work starts, and tell you plainly what has to be replaced versus what just needs reseating.
Which CGI Models This Applies To
CGI’s home addition and ADU envelope work in Tampa usually involves one of three situations: a new addition tied into an existing CGI cladding system, a detached ADU built with CGI panels or impact-rated window systems, or a repair to an older CGI component that is no longer watertight. The compatibility question is not just about CGI’s current catalog. Homes built in the 1990s through the mid-2010s across Westchase, Carrollwood, and Seminole Heights often carry earlier-generation CGI panel profiles that are no longer sold under the same name.
Before ordering anything, we photograph the fastener pattern, measure the panel profile depth, and locate the manufacturer label if it still exists on an inside jamb or behind a piece of trim. CGI changed spacing and gasket tolerances across product generations, and a panel that looks identical from ten feet away can be off by a quarter-inch in the locking channel. For the OEM-versus-aftermarket decision: we default to OEM CGI components when the structure still needs to hold a CGI wind-load warranty. For a purely cosmetic repair on an older home where the original warranty has long expired, a quality aftermarket gasket or trim profile often performs better than the original material, especially against salt air and afternoon UV.
Styles & brands we work with
Signs Your CGI Home Additions & ADU Is Failing
- Gap at the transition seam. The joint where a CGI addition meets the original wall opens or closes with the seasons. This is almost always a flashing failure underneath, not a defect in the CGI panel itself. Left alone, Tampa’s summer rains channel water straight into the wall.
- Soft spot around window openings. The CGI window system is intact, but the bucking around the rough opening has absorbed moisture. In wood-frame additions from the 1990s, this is the first place we open the wall. It rarely announces itself until the drywall inside shows a shadow.
- Caulk and gasket material peeling or crumbling. Florida UV eats flexible sealants faster than almost anywhere in the country. If the gasket around CGI panels has turned chalky or the trim caulk lifts away in strips, the water barrier is gone even though the panel looks fine.
- Doors that no longer close cleanly. On ADUs with CGI side-lites and heavy impact doors, a door that suddenly drags or gaps at the top often means the subfloor or a sill plate has moved. In Tampa’s sandy soil, slab-grade ADUs settle unevenly, and the door is the first thing to tell you.
- Musty smell in the northwest corner of the room. We see this in Tampa additions more than anywhere else. The prevailing summer storms drive rain from the west-northwest, and a small exterior penetration on that elevation wets insulation for months before it shows on paint.
See the difference
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AfterReplacement Cost & What’s Included
A full CGI home addition in Tampa ranges from $45,000 to $130,000 depending on size, foundation type, and whether you’re matching existing CGI profiles or re-siding the tie-in wall. A detached ADU runs $90,000 to $220,000 once you factor utility connections, a kitchenette, and the separate meter panel Tampa code requires for a true ADU with a second address.
What should you expect in a written line-item quote? The number includes the panel or trim system materials, all flashing and gasket replacement at transition points, rough-carpentry repairs if the framing behind the CGI has been compromised, and finish work so the new section reads as part of the original house rather than a patch. Every quote we write in Tampa names the materials by manufacturer, includes the waste factor so there are no day-of surprises, and carries the 365-Day Done Right Promise. If the seam still leaks after a year of Florida rain, we come back and make it right.
DIY or Call Us?
There are two things an owner can safely do before calling us. First, photograph the failed area from three angles, including a straight-on shot that shows the panel profile. Second, run a dollar bill around the suspect window or door gasket. If it slides freely anywhere, the seal is gone and you have a clear answer for what’s failing. That’s the safe limit of DIY here.
What we would not do is attempt to remove or reseat a CGI panel yourself. Panels under wind load are under tension at the fasteners, and on an older Tampa home, the substrate underneath may be softer than expected. The same is true for expanded addition tie-ins: pulling trim to investigate usually reveals a structural issue, not a simple caulk fix. If you’re seeing any of the signs above, call (850) 779-4017 and we’ll schedule a walkthrough. We write it down before we start so nobody is guessing mid-project.
FAQs
How long does a CGI home addition or ADU envelope last in Florida?
With proper flashing maintenance, a CGI panel system should last 30 to 40 years even in Tampa’s humidity and afternoon UV, but the gaskets, sealants, and transition flashing typically need replacement every 10 to 15 years. Most failures we see are not the CGI product itself; they are the tie-ins and flashing around it. Call (850) 779-4017 for a free estimate on the specific repair you’re facing.
Can my failed CGI part be repaired instead of replaced?
That depends on what has failed. Gaskets, sealants, and trim are almost always repairable at a fraction of full replacement cost. A panel that has delaminated or a window buck that has rotted through usually requires replacement of that component and the framing behind it. We will tell you which one you have, with photos, before any cutting starts. Call (850) 779-4017 to schedule a free walkthrough.
How long does a CGI part replacement or tie-in repair take?
A straightforward gasket and flashing replacement on a single transition seam takes one to two days. A full ADU envelope repair, or a panel replacement that exposes rotted framing, can run one to two weeks depending on what we find behind the wall. Written timeline, written price, both handed to you before work begins. Call (850) 779-4017 for a free estimate.
Do you stock CGI parts on the truck?
We stock common gasket profiles, trim profiles, and sealant systems used on Tampa’s most common CGI panel generations, along with KraftMaid, Cambria, and Silestone finish materials for the interior scope of an addition or ADU. Panel-specific components are measured, confirmed against your era of CGI product, and ordered before the crew arrives. Call (850) 779-4017 and we’ll check what applies to your house.
Written by Graham Stein, Owner, Elmstead Remodeling Tampa at Elmstead Remodeling Tampa, serving Tampa and nearby areas.
