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Therma-Tru Home Additions & ADU: The Orlando Owner’s Guide
Home additions and ADU construction in Orlando typically run $45,000 to $130,000, with accessorized ADU builds reaching $90,000 to $220,000 depending on size, foundation work, and finish level. Sawyer Remodel Orlando handles Therma-Tru entry door integration on every addition we build, because the door is the first thing you touch every day and the first thing that fails if it’s installed wrong. Most owners discover their Therma-Tru door is underperforming during the first big rain after the addition is completed, or when the summer humidity settles in and the slab edge starts letting air through. We stock Therma-Tru-compatible weatherstripping, thresholds, astragals, and sill pans on the truck for exactly this reason.
The honest picture: a home addition is a structural project, not a parts swap. But the Therma-Tru components within it follow the same rules as any door installation. We’ll walk you through what actually fails, what it costs, and how to avoid paying for the same fix twice.
Key Takeaways
- Home additions in Orlando run $45,000 – $130,000; ADU construction runs $90,000 – $220,000.
- Therma-Tru door integration is an exact-fit process, not a universal install. Slab height, rough opening, and sill pan detail matter.
- Florida humidity and afternoon thunderstorms find a bad sill installation within one season.
- We’re an independent Orlando contractor. We install and service Therma-Tru products but are not affiliated with Therma-Tru.
- Written price before work starts, photo updates during the build, and a 365-Day Done Right Promise on the finished job.
Styles & brands we work with
Which Therma-Tru Models This Applies To
Therma-Tru’s lineup for additions and ADUs in Florida splits into two practical camps: fiberglass smooth-surface doors (the Classic-Craft and Pulse series) and their steel models (the Benchmark series). The fiberglass lines hold up better in Orlando humidity because the skins don’t absorb moisture, but the slab edge and threshold are still exposed and still fail if the sill pan wasn’t flashed correctly.
The compatibility gotcha most owners hit is measurement. Therma-Tru fiberglass doors are factory-machined for specific hinge and bore locations, and the slab thickness is set at 1-3/4 inches. If your addition’s rough opening was framed to a standard 36-by-80 but the floor was poured slightly out of level, the door will bind at the latch stile within months. We measure slab thickness, reveal, and sill deflection before quoting, because “close enough” is how you get a door that whistles in a July thunderstorm.
OEM Therma-Tru weatherstripping and adjustable thresholds are our default recommendation for any in-warranty door. For out-of-warranty doors, quality aftermarket equivalents from brands like Endura and MD Building Products perform identically at a better price. The one place we never substitute aftermarket: the sill pan. That’s a Therma-Tru-specific profile, and a generic pan creates exactly the rot point you’re trying to avoid.
Signs Your Therma-Tru Home Addition or ADU Door Is Failing
- Daylight visible at the bottom corners of the door. The threshold has dropped or the sill wasn’t shimmed before the door was set. Central Florida slab movement over a season is enough to open a gap that lets bugs and humidity straight through.
- The door binds mid-swing or won’t latch without a shove. The jamb has moved, which means the rough opening framing or the slab itself has settled. Forcing the door makes the latch hole wallow out, and now you’re replacing the slab edge too.
- Water stains on the interior flooring near the door after heavy rain. That’s a sill pan failure or missing backer rod under the threshold. In Orlando’s afternoon downpour pattern, this shows up fast and the fix is pulling the door, not caulking around it.
- The sweep drags or leaves a visible gap against the threshold. Therma-Tru sweeps wear faster in sandy Central Florida soil. The replacement is an hour of work, but if the threshold itself is bowed, the sweep won’t fix it.
- Hinge screws spinning in place instead of biting. The screw holes in the jamb have stripped, which happens on additions where the framer used short screws into the trimmer stud. Longer screws or a complete hinge replacement is the fix, not toothpicks and glue.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
For the Therma-Tru components within a home addition or ADU project, here’s what Orlando owners should budget:
- Threshold replacement (adjustable, Therma-Tru profile): $150 – $400 installed.
- Weatherstripping replacement (full perimeter, OEM): $100 – $250 installed.
- Sill pan re-flash and re-install (door pulled and reset): $500 – $1,200 depending on rot discovery at the sheathing.
- Full door replacement within existing opening (Therma-Tru Benchmark or Classic-Craft): $1,800 – $5,000 with labor and finish trim.
- Full home addition build (framing, electrical, HVAC, finish, Therma-Tru door integration): $45,000 – $130,000.
- ADU construction (foundation to finish, kitchenette and bath included): $90,000 – $220,000.
Every quote from Sawyer Remodel Orlando is a written, line-item price before any work starts. You’ll see the part, the labor, and the finish detail broken out. If we open a wall and find rot the original builder hid, you hear about it with photos and a written change order before we proceed. No surprises at the invoice.
DIY or Call Us?
What you can safely do yourself: inspect for daylight gaps at the threshold, check the door’s reveal (the gap between slab and jamb should be even, about 1/8 inch all around), and keep the bottom sweep free of sand and debris. Sand is brutal on Orlando door sweeps, particularly in neighborhoods near Lake Nona and the Conway chain of lakes.
Where DIY goes wrong: pulling a Therma-Tru door off its hinges to replace a threshold or pan without a second set of hands, without the right shims on site, and without accounting for the door’s weight. These slabs run 60 to 80 pounds, and once the sill pan is exposed, the window to fix mistakes is measured in the next rainstorm. If you’re dealing with a new addition or ADU, the framing, flashing, and waterproofing are interconnected. A bad reset voids the manufacturer’s detail and creates a rot point inside your new build. That’s the wrong place to save a couple hundred dollars. Call us at (850) 809-0306 and we’ll price the fix straight.
FAQs
A properly installed Therma-Tru fiberglass door in Central Florida lasts 20 to 30 years on the slab itself, with weatherstripping and threshold replacement every 5 to 8 years. Steel Therma-Tru doors run 15 to 25 years here, with the failure point almost always the bottom rail if the sill pan was done wrong.
Sometimes yes. If the threshold cap is cracked but the base is sound and level, we can replace just the cap. If the base has settled or the sill pan underneath is compromised, an honest repair means pulling the door and re-flashing, which costs more but eliminates the rot point. Call (850) 809-0306 for an exact quote.
A straightforward threshold and sweep swap takes about one hour on site. A full door replacement within an existing opening runs a half day, including trim and caulking. A door that needs sill pan re-flashing runs a full day, and if we’re doing it as part of a new addition or ADU build, the door work slots into the overall project schedule, which runs 8 to 16 weeks depending on scope.
Yes. Our Orlando trucks carry Therma-Tru-profile adjustable thresholds, OEM weatherstripping, sweeps, hinge screws, and sill pan flashing. Door slabs are ordered per spec, which takes 2 to 5 business days for Therma-Tru’s common fiberglass lines. If it’s an emergency, we’ll secure the opening and tell you exactly what the fix requires before you spend a dollar.
Written by Luca Romano, Owner & Lead Contractor, Sawyer Remodel Orlando at Sawyer Remodel Orlando, serving Orlando and nearby areas.
