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Therma-Tru Home Additions & ADU: The Long Beach Owner’s Guide
We install and build Therma-Tru-compatible home additions and ADUs across Long Beach, with most full additions landing between $45,000 and $130,000 depending on size, foundation work, and finish level. If you’re planning an addition or ADU around existing Therma-Tru doors and windows, we match the new opening specs to what’s already on your house so the transition doesn’t look like an afterthought. Most Long Beach owners call us after realizing their existing Therma-Tru units either won’t fit the new roofline, need to be relocated, or the rough opening was framed wrong by a previous crew and now the door binds every time the humidity shifts.
Here’s the reality we see in Long Beach neighborhoods like Belmont Heights, Bixby Knolls, and Naples: Therma-Tru makes a good door, but the units are only as good as the rough opening behind them. When you’re adding square footage or building an ADU, the door and window package has to be spec’d early, not swapped in later. The moment you change wall depth from 2×4 to 2×6 for insulation or shear wall requirements, your Therma-Tru jamb depth changes with it. Miss that detail and you get a door that won’t seal, a threshold that leaks, or a frame that looks like it was forced into place.
Key Takeaways
- Therma-Tru home additions and ADUs in Long Beach typically run $45,000 – $130,000 installed, including door and window integration.
- Wall depth, rough opening size, and hinge placement have to match your Therma-Tru spec before framing starts.
- We handle the full build: framing, rough openings, install, trim, and finish. One crew, one written price.
- Luca Romano has worked Long Beach job sites for nearly two decades, from Belmont Shore bungalows to ADUs near the Queen Mary.
Which Therma-Tru Models This Applies To
Therma-Tru builds entry doors, patio door systems, and sidelite configurations that show up in a lot of Long Beach homes from the 1990s through today. The compatibility detail that matters for additions and ADUs is this: Therma-Tru doors are manufactured to specific rough opening widths, typically 2 feet 6 inches up to 3 feet 6 inches for entry units, and the jamb depth has to match your wall framing. A 4-9/16 inch jamb fits a standard 2×4 wall with drywall. A 6-9/16 inch jamb fits a 2×6 wall. Long Beach ADUs with upgraded insulation or shear wall requirements often move to 2×6 framing, and that changes the door package.
We work with both OEM Therma-Tru units and quality aftermarket equivalents that match the same rough opening and jamb spec. For a homeowner, the OEM-versus-aftermarket call usually comes down to lead time and budget. OEM Therma-Tru orders can sit for weeks. A matching fiberglass or steel unit from a comparable manufacturer can land in days and perform the same at the threshold. We’ll price both and let you decide with the numbers in front of you. Check the hinge edge of your existing Therma-Tru door for a label: the series line and size are printed there, and that’s what we match against.
Styles & brands we work with
Signs Your Therma-Tru Home Additions & ADU Is Failing
- Door binds at the top corner or rubs the threshold. The rough opening was framed out of square or the foundation moved. Long Beach clay soil expands and contracts, and additions on older lots settle within the first year. The door frame follows the house.
- Gaps appear between the door frame and the wall sheathing. Someone framed the opening too wide and tried to shim the difference. Over time the shims compress, the screws back out, and daylight shows through. This is the most common failure we correct on semi-recent additions.
- Threshold leaks during winter rains. Long Beach doesn’t get much rain, but when it comes, it finds every improperly flashed door. Therma-Tru thresholds need a continuous pan flashing underneath, and a lot of additions skip that step. Water wicks into the subfloor and rots it before you see the damage.
- Door is difficult to latch or won’t stay latched. The frame racked because the header was undersized. A Therma-Tru door is heavy. Put it under a weak header and the whole assembly twists, pulling the strike plate out of alignment.
- Visible cracks around the rough opening on the exterior. Stucco and siding crack at the corners when the opening flexes. If you see a diagonal crack running from a door corner up toward the roofline, the framing behind it is moving.
See the difference
Before
After
Before
After
Before
AfterReplacement Cost & What’s Included
A Therma-Tru-compatible home addition or ADU in Long Beach runs $45,000 to $130,000 installed, depending on the scope. A smaller bump-out with one door and two windows sits at the low end. A full ADU with a kitchen, bath, separate entry, and all the door and window packages embedded lands at the high end. Here’s the line-item breakdown we use for the parts side of the equation:
- Therma-Tru-compatible entry door, installed: $800 – $2,500, depending on size, glass package, and finish
- Rough opening framing (new or correction): $400 – $1,800 per opening, including header and sill work
- Full addition or ADU build with door and window integration: $45,000 – $130,000
- Garage conversion with Therma-Tru entry integration: $30,000 – $80,000
Every quote includes a written price before work starts, the rough opening spec’d to the door, flashing and sealing done correctly, and our 365-Day Done Right Promise on the workmanship. If the door binds a year in, we’re back. No argument, no invoice. That’s the point of the guarantee.
DIY or Call Us?
You can check a few things yourself: look at the hinge edge label to identify your Therma-Tru model, measure the rough opening width and the jamb depth, and check whether the door rubs in the frame. Those facts help you talk to us intelligently and they speed up the quote.
What you shouldn’t do is re-frame a rough opening or attempt to relocate a Therma-Tru door on an addition without understanding headers, shear requirements, and Long Beach building code. A wrong header size doesn’t just sag the door, it can compromise the wall. If the opening is out of square by more than a quarter inch, you need a saw, a level, a rebuild, and the patience to do it right. That’s the part where you call us at (562) 512-6480. Luca Romano has rebuilt rough openings all over Long Beach, and the work tells you everything. The rest is just talking.
FAQs
A properly installed Therma-Tru unit with a correct rough opening and proper flashing should last 20 to 30 years in Long Beach’s coastal climate. The frame behind it is usually what fails first, not the door itself. Salt air is more forgiving to fiberglass than to wood or unsealed steel. If your rough opening was framed right, the door holds. If it wasn’t, you’ll see the signs in the first two years. Call (562) 512-6480 and we’ll tell you which situation you’re in before you spend a dollar.
Sometimes. If the binding is minor and the framing is sound, we can adjust the hinges, re-shim the frame, and re-flash the threshold without tearing out the opening. If the header is undersized or the framing is out of square, the repair means pulling the door, rebuilding the opening, and re-setting everything. We’ll show you photos of what we found before we quote a repair versus a rebuild, and you approve the number before we start.
A single door swap on an existing, square opening takes a day: remove, set, seal, trim, and haul off. If the rough opening needs to be corrected, budget two days. If the door is part of a larger addition or ADU build, the door and window package is scheduled into the overall project timeline, and you’ll have a written schedule before we begin. We don’t ghost between visits. Live arrival time, photo updates, and a digital invoice you pay from a link. That’s how every Sawyer Remodel Long Beach job runs.
We stock common rough opening sizes and threshold components on the truck, along with matching aftermarket equivalents that install the same day. For specific Therma-Tru series lines, glass configurations, or custom finishes, we order through our supplier network and install as soon as the unit lands. You’ll know the lead time and the exact price before you commit. We also stock and install materials from KraftMaid, Cambria, and Silestone for the interior side of your addition or ADU, so the door and the finishes arrive from one source.
Written by Luca Romano, Owner, Sawyer Remodel Long Beach at Sawyer Remodel Long Beach, serving Long Beach and nearby areas.
