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Therma-Tru Home Additions & ADU: The Fresno Owner’s Guide
We install and build Therma-Tru-doored additions and ADUs across Fresno, with most projects landing between $45,000 and $130,000 depending on square footage, foundation work, and finish level. If you’re reading this because a Therma-Tru door on an existing addition is binding, leaking, or failing to latch, the culprit is usually the rough opening shifting over time in our clay-heavy Fresno soil, not the door itself. We see it often enough that we’ve built our framing and door-setting sequence around preventing it from day one, and we stock the shims, sill pans, and flashing details to correct it when it shows up in an older build.
Which Therma-Tru Models This Applies To
Therma-Tru builds entry door systems in three broad families: fiberglass (Smooth-Star, Classic-Craft, and the newer Pulse line), steel (the Traditions and Benchmark series), and the multi-point locking systems fitted to their fiberglass and steel units. The door slab and frame are the visible parts, but the real compatibility question when you’re adding onto a home is the sill pan and the rough opening: Therma-Tru frames expect a specific level, square opening with a pan that drains, and in Fresno that pan matters more than in drier climates because winter rains hit hard and fast. We match the existing door’s swing, hinge placement, and jamb depth, then verify the sill profile before ordering a replacement or new unit. OEM parts are available through Therma-Tru dealers, but quality aftermarket weatherstripping, adjustable sills, and corner seal pads perform just as well when the door system itself is sound. Bradford Remodeling Co Fresno is an independent contractor and not affiliated with Therma-Tru; we recommend their doors because the fiberglass skins hold up in Central Valley heat without warping the way wood veneers do.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Door drags or binds at the latch side. This is almost always a rough opening that has settled or a frame that was shimmed incorrectly at install. The fix requires re-shimming and re-securing the jamb, not planing the door slab, which destroys the weather seal.
- Air or daylight visible around the weatherstripping. The compression seal only works when the door and frame align. If the door has shifted even a quarter inch out of square, the corners leak and your cooling bill in a Fresno summer climbs fast.
- Sill leaks during rain. A failed sill pan or an adjustable sill that wasn’t leveled lets water run under the threshold and into the subfloor. By the time you see a stain on the interior flooring, the substrate is already damp.
- Multi-point lock won’t engage without lifting or pulling the door. This means the frame is racked. Forcing the lock damages the gearbox and the strike plates, and that’s a $400 to $900 rebuild on top of fixing the frame.
- Frame rot at the bottom corners. Even fiberglass doors sit in a wood or composite jamb that wicks moisture if the pan was skipped. In Fresno’s winter wet-dry cycle, rot sets in within three to five years on a missed pan.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a straight door-and-frame replacement on an existing addition or ADU in Fresno, you’re looking at $3,500 to $8,500 installed when the opening is sound and we can reuse the surrounding trim. A full addition or ADU build that includes Therma-Tru doors as part of the envelope runs $45,000 to $130,000, with the door package itself typically $1,200 to $4,500 depending on glass, finish, and the multi-point lock option you choose. What drives the number on a door replacement is the condition of the rough opening: if we’re re-framing and correcting a settled wall, labor jumps accordingly. Every estimate we write lists the parts, the labor, and the disposal in separate line items. You get a written price before work starts, and the completed work carries our 365-Day Done Right Promise in writing: if it fails within a year, we return and correct it at no charge.
DIY or Call Us?
You can check a few things yourself: look for gaps in the weatherstripping with the door closed, check that the sill drains aren’t clogged with dirt, and confirm the hinges are tight. That’s about where safe DIY ends. Re-shimming a Therma-Tru frame requires removing interior and exterior trim, cutting the fasteners, re-leveling the jamb in three planes, and re-installing the sill pan correctly. Get any of those steps wrong and you’ve got an air leak, a water leak, or a door that slams itself. If the problem is in the rough opening, a hammer and some shims won’t fix the underlying settlement. Call us at (559) 785-2712 and we’ll tell you honestly whether it’s a reset or a re-frame. The estimate says what we build, and we build what the estimate says.
FAQs
The fiberglass slab itself will go 20 to 30 years in the Central Valley sun without fading or warping, but the weatherstripping, corner seals, and the adjustable sill typically need attention every 5 to 8 years. The frame and the rough opening are the real variables: if the foundation settles or the original pan was skipped, you’ll see issues in the first few years. Call (559) 785-2712 and we can assess whether you need a full replacement or just a re-seal.
Yes, in many cases. If the slab is intact and the problem is alignment, weatherstripping, or a sticking multi-point lock, we can often re-shim the frame, replace the seals, and adjust the lock for a fraction of the cost of a new door. The deciding factor is whether water has reached the frame or subfloor. Once rot starts, a patch becomes a placeholder for a bigger fix. Estimates for repairs are free, and the written price covers the full scope.
A straightforward door-and-frame replacement on a sound rough opening is a one-day job. If we’re correcting framing, fixing a rotted sill, or addressing settlement on an older Fresno addition, expect two to three days including trim and paint. We’ll give you the schedule in the written estimate before we start.
We keep common Therma-Tru-compatible weatherstripping, corner seal pads, adjustable sills, and shim stock in our vehicles for same-visit corrections on doors we’ve previously set or assessed. Complete door units are ordered to spec, which usually takes five to ten business days. We’ll tell you what’s on hand and what needs ordering before you commit to anything.
Written by Curtis Lane, Owner, Bradford Remodeling Co Fresno at Bradford Remodeling Co Fresno, serving Fresno and nearby areas.
