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Therma-Tru Home Additions & ADU: The Fort Worth Owner’s Guide
If you’re planning a home addition or ADU in Fort Worth and want Therma-Tru entry and patio doors specified into the build, a full addition typically runs $45,000 to $130,000, while a detached ADU in Tarrant County generally lands between $90,000 and $220,000 depending on utilities, foundation work, and finish level. We’re Elmstead Remodeling Fort Worth, a Cedarwell company, and we write that price down before any work starts: labor, materials, Therma-Tru door units, permit coordination, and the clean-up. What homeowners usually discover mid-plan is that the door and window decisions matter more than they expected: the wrong rough opening size or hinge spec can delay a job in a city where summer heat and spring storms don’t wait on anyone.
Which Therma-Tru Models This Applies To
Therma-Tru doesn’t sell “home addition kits,” so what we’re really matching is the door and sidelight configuration your addition calls for. The compatibility question comes down to three things: the rough opening width and height your framer actually built (not what the plan says), whether the door swings in or out per Fort Worth residential code, and the series (Fiber-Classic, Smooth-Star, Pulse, or Classic-Craft) you want on the exterior face. Here’s the gotcha most people don’t see coming: Therma-Tru entry doors use proprietary sill pans and weatherstripping profiles, so a generic slab from a big-box store won’t seat correctly into a Therma-Tru frame. We measure the rough opening ourselves before ordering, and we spec the hinge prep (standard 4-1/2″ x 4-1/2″ on most residential units) rather than trusting a handwritten door schedule. Elmstead Remodeling Fort Worth is an independent contractor; we aren’t affiliated with Therma-Tru, but we build additions and ADU entries to accept their product lines without field modification. When an OEM unit is months out, we’ll discuss quality aftermarket options only where the hinge and sill geometry match exactly, and we’ll show you the written comparison before you sign anything.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Binding at the latch or top corner. In Fort Worth clay soil, additions settle unevenly during the first two Texas summers. The frame racks slightly, and a Therma-Tru door that swung clean at installation now catches. The fix is often re-shimming the rough opening, not replacing the slab.
- Exterior light visible around the weatherstripping. Therma-Tru’s compression weatherstripping degrades faster here than in cooler climates; UV and 100-degree afternoons bake the vinyl over several years. Air and insects get in. Replacing the weatherstripping and re-aligning the threshold usually tightens it.
- Water staining inside the addition near the sill. This is almost always a sill pan or flashing issue, not a door-slab issue. Therma-Tru frames need proper pan flashing under the threshold; skip that step and Fort Worth’s spring downpours find the gap.
- Door slab feels “soft” or has a cracked skin. Fiber-classic and Smooth-Star slabs last decades, but a hard impact or a pet scratch that wicked moisture can delaminate the skin near the bottom. That’s a slab replacement situation, and the trim and hardware usually carry over.
- Hinge screws keep stripping. This is less about Therma-Tru and more about the jamb material behind the hinge. If a previous installer used short screws, the door starts sagging within a year. Longer screws into the rough framing usually correct it permanently.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
For a Therma-Tru entry or patio door as part of a Fort Worth addition or ADU, the installed door portion typically ranges from $2,000 to $5,500 depending on the series, sidelight count, and whether you want factory-finished color or paint-grade. The broader addition cost, $45,000 to $130,000 in Fort Worth, includes foundation, framing, electrical, HVAC tie-in, insulation, drywall, paint, trim, and the Therma-Tru units themselves. Our written price lists the door unit, hardware, rough-opening adjustment, flashing, exterior trim, and haul-away as separate line items, so there’s no guessing on the largest spend. The 365-Day Done Right Promise covers the whole project: if the door, the trim, the threshold, or the flashing isn’t right after the job is complete, we make it right. That’s stamped on every project we build in Fort Worth.
DIY or Call Us?
There are things you can safely check on your own: whether the door binds, whether the weatherstripping looks compressed or cracked, whether the threshold is level side to side. What you should not attempt is pulling a Therma-Tru frame or re-hanging a slab without knowing how the sill pan below is flashed. A mis-flashed door in a Fort Worth addition doesn’t just leak; it channels water behind the exterior sheathing where you won’t see it until the framing rots or the floor buckles. When an existing addition door is failing, we usually find the problem in thirty minutes on a site visit, and we’ll tell you honestly whether the slab, the frame, or the flashing is the culprit. If you’re planning a new addition or ADU and want the door spec settled before framing starts, call (682) 708-9180 for a written scope and price.
FAQs
Figure twenty to thirty years on the slab itself, but the weatherstripping and threshold cap usually need attention every five to seven years in the Fort Worth climate. Sun exposure on west-facing entries shortens that cycle slightly.
Most of the time, yes. Binding, drafts, sagging, and minor skin cracks are repairable by re-shimming, replacing weatherstripping and hinges, or patching the slab. Full replacement is usually only the answer when the slab has delaminated or the frame has rot.
A standard single-slab swap with no frame damage takes our crew half a day. A full frame-out, re-flash, and trim package runs two full days. For a new addition or ADU build, we schedule the exterior door install right after rough framing inspection, before drywall crews close up the walls.
We order every Therma-Tru unit to the opening size and hinge prep your project requires; we don’t keep slabs sitting in a warehouse because the wrong size is worthless. What we do stock is the hardware, weatherstripping, sill caps, and flashing we need for the repair side of the call. Fort Worth lead times on custom Therma-Tru orders run two to six weeks, which is why we set the door spec early in the planning phase rather than waiting until framing is done.
Written by Graham Stein, Owner, Elmstead Remodeling Fort Worth at Elmstead Remodeling Fort Worth, serving Fort Worth and nearby areas.
