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Therma-Tru Home Additions & ADU: The Dallas Owner’s Guide
If you’re planning a home addition or ADU in Dallas, your Therma-Tru doors and entry systems should be part of the conversation from day one. A properly specified exterior door on a new addition runs roughly $45,000 to $130,000 for the full project scope here in Dallas, with the Therma-Tru door portion typically a small but critical piece of that budget. Most Dallas homeowners don’t think about their entry door spec until the addition is already framed, and that’s exactly when a wrong header size or rough opening throws the schedule off by a week or more.
Here’s what we’ve seen across Dallas neighborhoods from Lakewood to Preston Hollow: the addition gets framed, the rough opening gets cut to a “standard” size, and then the homeowner picks a Therma-Tru door they love that doesn’t match the rough opening already in place. Now you’re either reframing, paying for a custom door, or settling for something you didn’t want. We’d rather plan the door spec when the plans are still on paper.
Key Takeaways:
- Home additions in Dallas run $45,000 – $130,000; ADU construction runs $90,000 – $220,000
- Therma-Tru door rough openings must be confirmed against the actual door slab spec before framing, not after
- Bradford Remodeling Co Dallas is an independent contractor; we install and spec Therma-Tru products but are not affiliated with Therma-Tru
- Every addition we build carries the 365-Day Done Right Promise with the written guarantee in your hand at close
Which Therma-Tru Models This Applies To
Therma-Tru builds their entry and patio door lines across several series levels: Classic-Craft, Fiber-Classic, Smooth-Star, and Pulse. Each series uses a different slab construction method and has different rough opening requirements. The Classic-Craft line, which is their premium fiberglass entry door, runs thicker slabs and often needs a beefier frame than a Smooth-Star at the same nominal width. That difference matters more in Dallas additions than in a simple door replacement, because you’re cutting the rough opening fresh, not working around an existing one.
Every Therma-Tru unit ships with a product label on the hinge edge of the slab that lists the series, the door size, and the manufacturing date. If you’re working with an existing Therma-Tru door on a Dallas home and planning an addition that ties into it, snap a photo of that label before you call anyone. It tells us exactly what we’re matching, and it saves you from paying for a door that arrives a quarter-inch off. For OEM versus aftermarket on Therma-Tru components like weatherstripping, sweeps, and thresholds: the OEM parts cost more but carry the Therma-Tru warranty, while quality aftermarket equivalents from suppliers we use are typically within a few dollars and functionally identical. Our position is this: for anything structural, use Therma-Tru. For consumable weatherstripping, a quality aftermarket part installed correctly is a reasonable choice on a Dallas budget.
One compatibility gotcha we flag regularly: Therma-Tru smooth fiberglass slabs and wood-grain slabs use different paint prep processes. If your addition calls for a painted door that matches existing trim, we spec Smooth-Star or Fiber-Classic and prep the slab properly so the paint doesn’t peel inside two Dallas summers. Get the prep wrong and the warranty is voided.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Door binds at the top corner on the latch side. This typically means the rough opening on the addition was framed slightly out of square, or the framing settled after construction. The door slab isn’t warped; the opening is. That’s a frame correction, not a door replacement.
- Visible daylight around the weatherstripping or a draft you can feel in winter. In Dallas, our thermal swings are hard on door seals. A gap that appears every January and disappears in April means the weatherstripping has compressed or the threshold has dropped.
- Water staining at the interior threshold after heavy rain. On additions, we see this most often when the exterior grade wasn’t sloped correctly or the sill pan under the Therma-Tru threshold wasn’t installed to their spec. The door is fine; the flashing beneath it is not.
- Lock engagement getting progressively stiffer. If you’re lifting the handle or jiggling the deadbolt to get it to throw, the door alignment has drifted. That’s usually hinges or frame, occasionally slab sag on a heavy Classic-Craft unit.
- Cracking or separation at the door-to-addition junction, either inside or out. New construction settles. A hairline crack at the casing is not a door problem. A crack wider than a dime that’s growing season over season is settlement that needs to be looked at before it turns into a structural issue.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
If the Therma-Tru door on your Dallas addition or ADU needs replacement rather than adjustment, here’s what that costs in this market. A full entry door swap including a Therma-Tru Fiber-Classic or Smooth-Star slab, new hinges, new weatherstripping, threshold, and installation runs $1,200 to $3,500 depending on size and whether we’re replacing the frame. A Classic-Craft premium unit with sidelites and a transom runs $4,000 to $8,000 installed. If the framing around the door is the problem, you add framing repair on top, which is time and material, typically $400 to $1,500 depending on what we find when we open the wall.
Every door we install in Dallas comes with a written price before we start, not an estimate that drifts. The written quote lists the door, the parts, the labor, and the disposal. What drives the range: door series, door width, whether the frame is being reused or replaced, and whether we’re addressing water damage or settlement alongside the door itself. The work is covered by the 365-Day Done Right Promise: if that door fails inside a year from install, we return and fix it at no charge. No fine print around that.
DIY or Call Us?
You can safely check a few things on any Therma-Tru door on a Dallas addition. Open and close it slowly and watch the gap between the slab and frame on all four sides; if it’s inconsistent, the opening isn’t square. Run your hand around the weatherstripping on a cold morning and feel for drafts. Look at the threshold screws; if they’re loose, tighten them and see if that changes anything. None of that requires tools beyond a screwdriver.
Where DIY goes wrong on additions is when the frame itself is settling, or when water is intruding behind the threshold. A door that needs shimming or a frame that needs correction is not a weekend project; get it wrong and you’ve turned a $400 fix into a $3,500 door plus repair. High-tension adjustments aren’t the concern with Therma-Tru entry doors the way they are with overhead garage doors, but water intrusion is: once moisture gets behind exterior cladding on a Texas addition, it works fast on framing and sheathing. If you see water stains or a growing crack, call us at (903) 326-8963. We’ll give you a straight number and a real scope.
FAQs
A correctly installed Therma-Tru fiberglass door should last 20 to 30 years in the Dallas climate, but the weatherstripping, threshold, and exterior finish typically need attention every 5 to 8 years. The slab itself rarely fails. What fails first in our market is the seal system and the finish, both of which are replaceable without replacing the door. Call (903) 326-8963 and we’ll tell you honestly whether you need a new door or a $200 weatherseal refresh.
Yes, in most cases. If the slab is sound but the door binds, drifts, or drafts, we can rehang, shim, replace seals, and adjust the threshold as individual repairs. The door gets replaced when the slab itself is cracked, delaminated, or the frame has water damage that can’t be corrected. We’ll tell you which category your door falls into before you spend a dollar.
A straightforward slab swap in an existing frame takes one day. A full frame replacement with the old frame pulled, new flashing, new interior casing, and finish work takes two to three days, plus paint curing time if the door is unfinished. We schedule Dallas addition door work around your availability and give you a written timeline with the quote.
We spec and order Therma-Tru doors directly for each project; we don’t stock slabs because the sizes and configurations vary too widely across Dallas additions to warehouse them efficiently. What we do maintain in stock on our service trucks is the hardware and consumable set: weatherstripping, sweeps, threshold caps, hinge packs, and lock sets that cover the most common Therma-Tru sizes and series. That means most repair work doesn’t wait on an order.
If your Dallas home addition or ADU needs a Therma-Tru door spec’d, repaired, or replaced, and you’ve been through contractors who no-show or reprice at the door, we invite you to call Bradford Remodeling Co Dallas at (903) 326-8963. We answer with a live person, 24 hours a day, seven days a week. We’ll put a written price in your hand before any work starts, and we’ll back it with the 365-Day Done Right Promise. Straight number, real scope, no surprises on delivery day.
Written by Curtis Lane, Owner, Bradford Remodeling Co Dallas at Bradford Remodeling Co Dallas, serving Dallas and nearby areas.
