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Therma-Tru Construction in Cupertino, CA | Workshop Contractors
We’re an independent Cupertino General Contractor and Therma-Tru service provider working across Cupertino’s Eichler and ranch-era housing stock. What makes our Therma-Tru work different here is that we understand how 60-year-old radiant-heat slabs, out-of-square rough openings, and Cupertino’s slow permit cycle affect how a prehung door actually sits, latches, and seals in your opening. We re-flash, reframe, and re-hang Therma-Tru entry and patio systems to match the real conditions of your Cupertino home, not the catalog illustration. Call (844) 384-3361 for a free estimate.
Why Cupertino Residents Choose Us for Therma-Tru Service
We’ve pulled, hung, and re-flashed enough Therma-Tru fiberglass and steel entry systems in Cupertino to know how these slabs, jambs, and sidelites behave in actual openings on Monta Vista ranches and Garden Gate Eichlers. That’s the difference between a door that looks right and one that closes square and seals against winter rain. We carry OEM Therma-Tru slabs, jambs, sweeps, and weatherseal for the common model lines, and we’ll source quality aftermarket hardware and glass inserts where they perform equal to factory spec. Noel Figueroa, our owner, learned framing on job sites where the old tradesmen checked every corner with a square, and he still runs our Cupertino crews that way. We’re an independent contractor: no manufacturer authorization, no partnership claim, no warranty endorsement from Therma-Tru. Just straight answers about what your opening needs. For the full scope of what we do, see our Therma-Tru sales & service overview.
Styles & brands we work with
Common Therma-Tru Construction Problems We Solve in Cupertino
- Out-of-square rough openings on aging framing. Original aluminum wiring and fifty years of seasonal movement leave header and jamb legs out of square, so a new Therma-Tru prehung slab drags or won’t latch without reframing the rough opening. We shim and reframe before we hang, not after.
- UV-blasted fiberglass finishes on south and west entries. Cupertino’s warm, dry summers hit south- and west-facing Therma-Tru Smooth-Star and Fiber-Classic doors hard. Paint and stain chalk and crack, and overlay skins blister where the factory finish was never re-sealed. We strip, re-seal, and re-finish before the damage reaches the substrate.
- Sill leaks at 1950s-60s slab and stoop transitions. Original thresholds and flashing at slab transitions leak in wet winters, inviting rot in wood jambs and frame components behind a door that otherwise looks fine. We re-set thresholds and re-flash before the rot spreads.
- Whistling doors on radiant-heat slabs. Eichler-type floors move with the seasons, pushing entry thresholds and sweeps out of contact so Therma-Tru doors leak air. We re-fit sills and weatherseal so the door actually holds a seal.
- Double-door and sidelite systems out of alignment. Prehung sidelite and double-door entry systems on Cupertino ranch homes shift over time, so astragals and weatherstrip gaps open up. We re-align, re-shim, and replace worn seals so the system closes as one unit.
Therma-Tru Service in Cupertino: What Local Conditions Mean for Your Equipment
Cupertino pulls permits through its own city building department, and plan checks are notoriously slow. On tear-down/rebuild and second-story projects, the exterior door schedule and the Therma-Tru rough-opening sizes that have to match the approved plans often get locked before framing even starts. Change a door swing or opening size after approval and the whole job stalls in the queue. That’s why our Cupertino clients bring us in early: we help you lock the door spec against the real opening dimensions on site, so your Therma-Tru prehung or slab matches the plans and passes inspection without a re-check. On a Monta Vista ranch remodel where the owner wanted a new Therma-Tru Smooth-Star entry with sidelites, our crew found the original opening framed into a wall that had shifted on the old radiant-heat slab, so the prehung unit would not square up—similar challenges to what we see with our Home Remodeling in Cupertino. We reframed and shimmed the jamb legs, re-set the threshold and flashing over the slab transition, and sealed the new door so it latched clean and didn’t leak through the coming winter rains. That’s the work that actually protects your investment in Cupertino’s climate: mild, wet winters followed by warm, dry summers that punish anything not sealed and square.
Therma-Tru Models & Products We Service in Cupertino
We service Therma-Tru Smooth-Star fiberglass entry doors, Fiber-Classic and Classic-Craft fiberglass entries, Pulse and Foundry series patio/sliding and hinged doors, and prehung sidelite and double-door entry systems. Our parts approach is simple: we favor OEM Therma-Tru slabs, jambs, sweeps, and weatherseal when the frame is sound, because fit and finish depend on it. We’ll specify quality aftermarket hardware and glass inserts where they perform equal to or better than factory, and we’ll tell you honestly when rehanging a new prehung unit beats patching a failing old one. For Cupertino turnaround, we keep the common sweeps, thresholds, and weatherseal kits in local stock so minor re-seals don’t wait on a distributor shipment. Every Cupertino service area job gets a written line-item estimate before we touch the opening.
See the difference
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AfterTherma-Tru Service Pricing in Cupertino
Door work on Cupertino homes varies by opening condition, not just the slab you choose. A clean prehung swap on a square ranch opening costs less than reframing an Eichler’s shifted jamb legs and re-setting the threshold over a radiant-heat slab. Here’s what common project scopes run in this market:
| Service | Typical Range |
|---|---|
| Window Replacement | $4500 – $15000 |
| Impact Window Installation | $8000 – $25000 |
| Roof Repair | $400 – $1800 |
| Roof Replacement | $8000 – $20000 |
Your free estimate includes measuring the existing opening, checking jamb square and threshold condition, and a written line-item scope with no change orders mid-job. Call (844) 384-3361 for an exact quote on your Cupertino home.
Serving Cupertino, CA — Our Local Coverage Area
We’re based in the Cupertino area and know this community well, and we also provide Therma-Tru repair in Los Altos. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – Therma-Tru Construction in Cupertino
A same-size, like-for-like door replacement in an existing opening generally doesn’t require a Cupertino building permit, but if your project changes the rough opening size, adds sidelites, or is part of a larger permitted remodel, the door schedule gets folded into that permit. When in doubt, we’ll confirm with the city before work starts. Call (844) 384-3361 and we’ll tell you what applies to your project.
Eichler homes sit on radiant-heat slabs that move with seasonal temperature swings, which pushes thresholds and sweeps out of contact and can shift jamb legs out of square. The fix is re-fitting the sill, shim, and weatherseal to the actual movement in your floor, not just replacing the sweep. Call (844) 384-3361 for a free inspection.
Yes. We match slab profiles and finish by the Therma-Tru line your sidelites came from, and we’ll specify the right hardware and glass inserts to keep the whole entry looking like it was purchased together. For Cupertino homes with original ranch trim, we’ll also check whether your existing jamb and casing can carry the new unit or need re-fitting.
Cupertino’s warm, dry summers deliver hard UV on south- and west-facing entries. Therma-Tru’s factory finish holds up for years, but once the topcoat is breached by weather or a scratch that was never re-sealed, the overlay skins can blister and the stain can chalk. Re-sealing before that happens is cheaper than stripping and re-finishing. Call (844) 384-3361 for a finish assessment.
If the slab is delaminating or the jambs are rotting at the sill, replacement makes more sense than patching. If the slab is sound and the issue is weatherseal, a threshold, or hardware alignment, repair is often the better spend. We’ll show you both numbers and tell you which one we’d pick for our own house. Call (844) 384-3361 for a free line-item estimate.
Service Areas Near Cupertino
Our Cupertino crews also cover homes in the surrounding South Bay and Peninsula communities. We regularly run Therma-Tru service into Therma-Tru service in Sunnyvale, Therma-Tru service in Loyola, and the nearby neighborhoods off De Anza and Stevens Creek Boulevard. If you’re a few blocks past the Cupertino line, call us.
Book Your Therma-Tru Service in Cupertino Today
If your Therma-Tru entry or patio door is dragging, whistling, leaking, or just showing its age on a Cupertino ranch, call (844) 384-3361—we also offer Therma-Tru service in Saratoga. We’ll schedule a free estimate, check your openings, and give you written numbers before any work starts.
Written by Noel Figueroa, Owner at Workshop Contractors, serving Cupertino since the day we hung our first Therma-Tru on an Eichler slab.