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PGT Home Additions & ADU: The Tampa Owner’s Guide
A PGT home addition or ADU in Tampa typically costs $45,000 to $130,000, depending on square footage, foundation work, and finish level. If you’re reading this, you likely already have a PGT product (windows, doors, or a sunroom structure) that’s starting to show its age, and you’re trying to figure out whether the failing part can be replaced or if the whole addition needs a rethink. We’ll walk you through what usually fails first, what it costs to fix properly, and when a repair makes more sense than a rebuild.
Bradford Remodeling Co Tampa is an independent contractor. We are not affiliated with PGT, but we’ve worked on enough PGT-glazed additions across Tampa to know their failure points cold. Most owners discover a problem the same way: a window that won’t seal, a door that’s binding, or water staining where the addition ties into the original roofline.
Which PGT Models This Applies To
PGT is a Florida company, and their impact-rated and vinyl window lines show up constantly in Tampa additions and ADUs. The most common series we see are the PGT WinGuard, PGT 5500 Series, and PGT SpectraGuard lines. Each has different frame depths, glass packages, and nailing fin profiles, and you can’t swap parts between them without checking the label first. Look in the corner of the window sash or on the head jamb, there’s a white sticker with the series code, size, and manufacturing date. If that sticker is gone, measure the frame depth: WinGuard sits around 3-1/4 inches, the 5500 runs thinner, and SpectraGuard varies by product line.
On the door side, PGT’s sliding glass doors and French doors carry their own hardware specs. The roller assemblies, strike plates, and weatherstripping are series-specific. A WinGuard door roller is not the same as a 5500 roller, and forcing one into the wrong track is how you end up with a door that grinds every time you open it.
One compatibility gotcha we run into in Tampa: PGT changed its glass spacer and sealant systems around several product generations, and older WinGuard units from the mid-2000s don’t accept the newer insulated glass units (IGUs) directly. You end up replacing the whole sash instead of just the glass. We check the manufacture date before we quote glass replacement.
For the addition structure itself, if it was built as a PGT sunroom or conservatory package, the frame extrusions and roof caps are proprietary. Aftermarket components exist, but we’ve seen too many forced fits create leaks at the mullion joints. For anything structural, we spec OEM or a documented equivalent from our supplier list, not a generic off the shelf.
Styles & brands we work with
Signs Your PGT Home Addition or ADU Is Failing
- Condensation between glass panes – The IGU seal has failed. Florida humidity accelerates this, and once the desiccant inside the spacer is saturated, the fog doesn’t go away. The glass has to come out.
- Water staining at the ceiling where the addition ties into the main house – The transition flashing or the sealant joint has opened. Tampa’s summer storms find that gap within one season.
- Sliding door binds or comes off the track – Roller assemblies wear out, and PGT rollers on older doors are pressed-in, not screwed, which means the bottom rail sometimes needs rework, not just a roller swap.
- Crank-out window operator strips or spins without moving the sash – The gear teeth inside the operator are gone. This is a common failure on PGT casement and awning windows after 10 to 15 years in Tampa’s heat and salt air.
- Drywall cracks at the corners of the addition’s windows and doors – The header or king stud has shifted, or the addition wasn’t tied into the existing foundation properly. This is a structural tell, not a caulk fix.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a PGT home addition or ADU project in Tampa, the installed range is $45,000 to $130,000. The spread exists because a 400-square-foot ADU with a bathroom and kitchenette runs toward the top of that range, while a simple bedroom addition tied to an existing wall with matching PGT windows sits lower. Foundation type drives a lot of it: slab-on-grade in Tampa’s sandy soil is straightforward, but pier-and-beam work or added structural steel pushes the number up.
Here’s how the line items typically break down on our written estimates:
- Design and structural drawings: $3,500 – $8,000, depending on whether it’s a simple addition or a full ADU with plumbing and electrical engineering
- Foundation and slab work: $6,000 – $18,000
- Framing, sheathing, and roof tie-in: $12,000 – $30,000
- PGT windows and doors (installed): $8,000 – $25,000, matching the existing series where possible
- Rough-in plumbing and electrical: $7,000 – $20,000 for an ADU; less for a simple addition
- Drywall, trim, paint, and flooring: $8,000 – $22,000
- Permits and inspections: $2,500 – $7,000, pulled under our name and closed out with city sign-off
Every estimate from Bradford Remodeling Co Tampa is a written price before work starts. Not a range, not a ballpark, not a “we’ll see how it goes.” The number we give you is the number on the invoice, unless you change the scope. And once the job closes, the 365-Day Done Right Promise applies: if anything in our work fails inside a full year, we come back and correct it at no charge. That’s in writing.
DIY or Call Us?
If you’re dealing with a failed PGT window operator or a sticking sliding door, you can safely inspect the label, check for obvious damage, and take photos before calling us. You cannot safely repair a failed IGU seal, replace a sash, or address water intrusion at the roofline tie-in. Those are not weekend jobs, and getting them wrong in Tampa’s hurricane season means water damage inside walls where you won’t see it until the drywall sags.
For anything structural, the answer is simple: call us. We’re at (941) 655-9297. Curtis Lane and the crew will come out, look at the actual site conditions, and give you a straight number. We reprice before the job starts, not after.
FAQs
PGT’s aluminum and vinyl framing products are built for Florida’s coastal climate and typically last 20 to 30 years in Tampa before the frames show meaningful wear, though the seals and moving parts have shorter lives. Plan on replacing window operators and door rollers every 8 to 12 years, and expect IGU seal failures in the 15 to 20 year range. The addition’s structure itself, if built correctly, lasts the life of the house. Call (941) 655-9297 if you’re seeing signs of premature failure.
Yes, in most cases on the window and door side: operators, rollers, weatherstripping, and glass packages are replaceable parts. The structure of your addition or ADU is a different story, and that’s where repair versus replacement becomes a judgment call based on what’s actually failed. Give us the symptoms and we’ll tell you what you’re looking at. Estimates are free.
A simple addition runs 8 to 14 weeks from permit to final inspection in Tampa. A full ADU with a kitchen and bathroom runs 16 to 26 weeks. The permit office timeline in Tampa affects the schedule more than any other single factor, and we pull permits under our name so there’s no finger-pointing if an inspection gets rescheduled.
We stock common PGT replacement parts on our trucks: door rollers, window operators, weatherstripping, and locks. Series-specific sashes, IGUs, and replacement frame components are ordered from our suppliers, usually with a 1 to 2 week lead time in Tampa. We work with documented material lists so you know exactly what’s going into your project, whether it’s PGT glass, KraftMaid cabinetry in the ADU kitchen, Cambria or Silestone counters, or anything else with a manufacturer spec behind it.
Straight number, clear scope, no surprises at close-out. Call (941) 655-9297 to schedule a free estimate for your PGT home addition or ADU in Tampa.
Written by Curtis Lane, Owner, Bradford Remodeling Co Tampa at Bradford Remodeling Co Tampa, serving Tampa and nearby areas.
