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Therma-Tru Home Additions & ADU: The Tampa Owner’s Guide
If you’re planning a home addition or ADU in Tampa and want Therma-Tru exterior doors specified into the build, a professionally installed entry or patio door package typically runs $45,000 – $130,000 for the full addition project, with the door package itself a line item inside that scope. We specify, order, and hang Therma-Tru doors as part of larger additions and detached ADU builds across Tampa, from Seminole Heights to Westchase. Most homeowners discover they need a door decision made early, often when the rough opening is framed and the wrong size door has already been ordered by someone else.
We write the door package into the fixed-price scope before a single tool comes off the truck, so nobody is guessing mid-project. That’s how Graham Stein runs every Elmstead Remodeling Tampa job.
Which Therma-Tru Models This Applies To
Therma-Tru builds their door systems around a handful of series lines, and the one you pick changes the rough opening requirements by up to 2 inches. The Fiber-Classic and Smooth-Star lines are the most common for Tampa additions because the fiberglass skins hold flat in our humidity. The Pulse and Classic-Craft lines go deeper into wood-grain looks but carry a longer lead time from order to delivery, often 4 to 6 weeks once we confirm the slab size.
The compatibility detail that catches people: a Therma-Tru door slab cannot be swapped into a non-Therma-Tru frame without checking the hinge prep spacing. Therma-Tru preps hinges at specific reveal depths, and mixing aftermarket slabs into a Therma-Tru frame voids the factory weatherseal fit. We always check the label on the hinge edge of the slab and match the frame series before ordering. OEM parts, weatherstripping, and adjustable sills come direct from Therma-Tru suppliers we’ve worked with for years. For a Tampa ADU with a covered entry, the Smooth-Star line is our usual recommendation: the composite stiles resist swelling during June through September rain cycles, and the factory finish holds up to direct sun better than a site-painted replacement.
Elmstead Remodeling Tampa is an independent contractor, not affiliated with Therma-Tru. We specify their doors because the warranty travels with the finished project and homeowners can verify the product spec by name.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- The door drags across the sill in the afternoon but swings free in the morning. Tampa’s heat and humidity expand the slab against the frame. Usually the hinges have settled, or the sill cap was never shimmed for our soil movement. We fix the hinge pack and re-level the sill, which is faster than a new door.
- Daylight shows through the top corner on the lock side. This is a frame racking issue, common on block-wall additions where the rough opening was oversized and shimmed unevenly. The weatherseal is now compressed beyond its travel. We re-square the frame and replace the seal with the correct Therma-Tru profile.
- Condensation fogs the decorative glass every morning. The insulated glass unit has lost its seal. In a Tampa ADU with eastern exposure, this happens faster than people expect. We order a matching replacement IGU through Therma-Tru’s glass program rather than replacing the whole slab.
- The multipoint lock catches but the door still rattles when a kid slams it. The adjustable strike plates have drifted out of alignment, or the lock body was installed without the reinforcement plate. We realign the hardware and add the strike reinforcement, then the door actually locks tight.
- Water stains appear on the interior floor after a hard rain. In Tampa, this is usually the sill pan flashing, not the door itself. If the pan is missing or installed without end dams, water travels under the threshold and into the subfloor. This is the repair that matters most to catch early, because by the time you see the stain, the sheathing is already wet.
See the difference
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After
Before
After
Before
AfterReplacement Cost & What’s Included
For a full addition or ADU build with Therma-Tru doors specified in Tampa, the project range is $45,000 – $130,000. The door package typically lands between $2,500 and $7,500 of that total, depending on series, glass options, and whether we’re hanging one door or a front-plus-rear pair. A standalone door replacement inside an existing addition runs lower, but this page is for the addition and ADU scope.
What moves the number: the size of the addition, whether it’s site-built or a prefab ADU shell, the foundation type (slab versus pier), and the finish level. What we include in writing: the Therma-Tru door package, framing correction if the rough opening is out of square, weatherseal and sill cap, hardware, and a photo of the clean-up before the crew leaves. The written price is fixed before any work starts, so the number you approve is the number you pay.
DIY or Call Us?
You can check the model label on the hinge edge, measure the slab width in three places, and look at whether the sill drains are clear. Those are all useful and safe. What you should not do is pull the door slab yourself on a hurricane-rated frame, because the screws holding the hinges into an impact-rated jamb are long and easy to strip if the door isn’t supported correctly. A dropped fiberglass slab cracks at the corner, and that turns a $200 hinge adjustment into a $2,800 door replacement.
If the issue is beyond a visual check, call (850) 779-4017 and we’ll walk through what we’re seeing before we ever schedule a visit. The estimate is free, and we’ll tell you over the phone whether it sounds like a repair or a replacement.
FAQs
Expect 20 to 30 years from the fiberglass slab itself, with weatherseal and sill cap replacement every 5 to 7 years in Tampa’s heat and rain. The decorative glass may need resealing sooner depending on sun exposure. Call (850) 779-4017 if you’re unsure whether your door is mid-life or end-of-life, and we’ll give you an honest read.
In most cases, yes. We repair hinge packs, re-square frames, replace weatherseal, reset sills, and swap failed glass units without pulling the slab. Replacement is only the right call when the slab itself is cracked, delaminated, or the frame has rotted at the bottom. We’ll show you the difference before we quote anything.
A straightforward single-door swap takes one day on site, plus 3 to 6 weeks if a custom slab has to be ordered from Therma-Tru. If we’re working inside a larger addition, the door goes in at the framing-finish stage and doesn’t add days to the schedule.
We keep common weatherseal profiles, hinge shims, sill caps, and strike reinforcement plates on the truck for the Smooth-Star and Fiber-Classic lines. Slab-specific parts, decorative glass, and full door packages are ordered per job so there’s no guessing on model compatibility. Call (850) 779-4017 and we’ll check the truck before we roll out.
Written by Graham Stein, Owner, Elmstead Remodeling Tampa at Elmstead Remodeling Tampa, serving Tampa and nearby areas.
