Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Therma-Tru Construction in Los Altos, CA | San Bruno Construction
We provide independent Therma-Tru door installation, repair, and replacement across Los Altos homes, including the 94022, 94023, and 94024 ZIPs. The one thing that sets our Therma-Tru work here apart is that we understand how Los Altos’s tight floor-area-ratio and lot-coverage rules push additions into narrow, shaded corridors where doors stay damp longer and need better flashing and sill detailing than they would on an open suburban lot. San Bruno Construction is not authorized, sponsored, or endorsed by Therma-Tru. We’re a full-scope General Contractor in Los Altos that orders directly from Therma-Tru distributors and follows their installation specs. Call (866) 472-1908 for a free estimate.
Why Los Altos Residents Choose Us for Therma-Tru Service
We’ve installed and serviced Therma-Tru fiberglass and steel entry doors, Classic-Craft American Style doors, and Slim-Line patio systems across hundreds of Los Altos remodels, second-story additions, and scrape-and-rebuild teardowns. Noel Carvalho grew up off El Camino Real in San Bruno and trained in construction technology at Skyline College, where he learned to read plans and think through load paths before a single tool comes out of the truck. That discipline carries into every Therma-Tru rough opening we set in Los Altos, from the ranch homes near the village core to Therma-Tru repair in Stanford and the hillside-adjacent lots at the foot of the Santa Cruz Mountains. We coordinate all the trades, order OEM Therma-Tru sills, sweeps, hinges, and lock blocks for doors still under original finish warranty, and source quality aftermarket weatherstrip and sill pans when older OEM trim is discontinued. One contractor, every phase, from countertops to rooflines to ADUs.
Styles & brands we work with
Common Therma-Tru Construction Problems We Solve in Los Altos
- Hairline cracks at the lock bore and hinge stiles. Smooth-Star and Fiber-Classic fiberglass skins on 1950s – 1970s ranch homes in Los Altos develop these cracks after years of daily cycles, especially when the door faces direct afternoon sun and then gets hit with winter atmospheric-river moisture. The thermal expansion and contraction works on the fiberglass until it eventually fractures at the stress points.
- Finish breakdown and grain-lift along the bottom rail. Classic-Craft American Style doors with stained finishes show this pattern when rain splash hits the threshold during the concentrated wet-season storms common at the foot of the Santa Cruz Mountains. Once water sits on the bottom rail, the stain lifts and the fiberglass grain pattern starts to show through.
- Binding or leaking patio door sills. Slim-Line and multi-slide patio doors in older Los Altos additions frequently bind or leak because the original rough opening was framed for a low-slope ranch threshold, and later site grading or a new hardscape raised the exterior finish grade above the sill pan. We see this constantly on rear expansions that push close to property lines.
- Rust on steel entry doors. Steel doors on ranch remodels rust at the bottom edge and hinge pockets when the original concrete porch slab lacks a proper drip and the door faces prevailing winter wind-driven rain. The rust starts invisibly inside the hinge pocket and works its way out.
- Drafty or sagging entry doors on second-story additions. When Los Altos homeowners add a second story, the new door landing often sits above an unconditioned stairwell, and the door swings through a different pressure zone than the original first-floor entry. If the rough opening wasn’t re-squared and the weatherstrip wasn’t upgraded to match the new exposure, the door leaks air and feels loose within a season or two.
Therma-Tru Service in Los Altos: What Local Conditions Mean for Your Equipment
Here’s something you won’t read on a generic Therma-Tru page: Los Altos’s floor-area-ratio and lot-coverage limits are tight and strictly enforced, which means most second-story additions and rear expansions land right up against existing side and rear property lines. That creates narrow, shaded exterior corridors around many Therma-Tru entry and patio doors, especially on the 1950s – 1970s ranch lots in the 94022 and 94024 ZIPs. A door in an open suburban yard gets morning sun and dries out after a storm. A door in a six-foot setback corridor between two houses stays shaded, stays damp, and cycles through wet-dry stress on the sill, the bottom rail, and the hinge stiles. We set sills higher, flash thresholds more aggressively, and use stainless hinge screws on these Los Altos jobs because we know the microclimate demands it. The same door installed in neighboring Mountain View or Loyola would behave differently, but Los Altos’s built-out, addition-heavy housing stock makes moisture management the deciding factor.
Therma-Tru Models & Products We Service in Los Altos
We work on the full Therma-Tru lineup that shows up in Los Altos homes: Smooth-Star fiberglass entry doors, Classic-Craft American Style collection doors, Fiber-Classic door series, and Slim-Line / Revolve patio door systems. Our approach to parts is straightforward. For any door still under its original finish warranty, we order OEM Therma-Tru replacement sills, sweep kits, hinges, and lock blocks. For older doors where OEM trim is discontinued, we source quality aftermarket weatherstrip and sill pans matched to the door profile. Our honest stance: a cracked skin or delaminated edge on a fiberglass door is usually a replace-the-slab call, while hardware and seal failures on an otherwise sound door are straightforward repairs. We keep common Therma-Tru sill pans and sweep kits on our trucks for faster Los Altos turnaround. You can see our Therma-Tru services across the Peninsula.
See the difference
Before
After
Before
After
Before
AfterTherma-Tru Service Pricing in Los Altos
| Service | Typical Range |
|---|---|
| Window Replacement (per opening, typical Therma-Tru entry or patio door swap scope) | $4,500 – $15,000 |
| Impact Window Installation (per opening, impact-rated door/window assemblies) | $8,000 – $25,000 |
| Roof Repair (flashing and threshold leak repair at door openings) | $400 – $1,800 |
What drives the cost in Los Altos is the condition of the rough opening after decades of wet-season exposure, whether the original framing needs re-squaring, and whether site grading or new hardscape has changed the exterior finish grade. A straight slab swap on a sound opening costs less than a full re-flash and sill-pan replacement on a door that’s been leaking into the subfloor. A free estimate includes a close look at the door, the threshold, and the surrounding flashing. Call (866) 472-1908 for an exact quote on your Therma-Tru door.
Serving Los Altos, CA — Our Local Coverage Area
We’re based in the Los Altos area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – Therma-Tru Construction in Los Altos
A crack at the lock bore is almost always a replace-the-slab call. The fiberglass skin carries structural load at the lock block, and patching a crack there fails again within months because the door still flexes with every cycle. We’ll pull the slab, verify the rough opening is still square, and set a new Therma-Tru door with an OEM sill and sweep. Call (866) 472-1908 for a free estimate.
Therma-Tru repair in Los Altos Hills faces similar challenges: floor-area-ratio and lot-coverage limits push additions and rear expansions close to side and rear property lines, which creates narrow, shaded corridors that stay damp longer. The original rough openings on ranch-era slabs were also framed for low-slope thresholds, and later grading or hardscape work often raised finish grade above the sill pan. We re-frame the opening, set a proper sill pan, and re-flash so water sheds away from the slab. Call (866) 472-1908 for a quote.
Yes. The Smooth-Star fiberglass entry door is the line we recommend most often for Los Altos ranches and Eichler-era homes because its sill profile and slab proportions sit naturally under the lower ranch rooflines, and it takes a factory finish that holds up through wet winters. For homes with stained classic trim, the Classic-Craft American Style collection matches better. We’ll match the door to the existing trim profile and roofline rather than forcing a style that fights the architecture.
Yes, within reason. If the existing door is still under its original finish warranty, we order a matching Therma-Tru slab with the same stain pack. If the finish has aged or faded, we’ll custom-stain the new slab to match the current color as closely as possible, then seal both doors so they age together. Exact matches on older doors that have been through multiple Los Altos wet seasons take some finesse, but we’ve done it on dozens of remodels. Call (866) 472-1908 to schedule a stain-match visit.
We re-flash the entire threshold assembly: sill pan, back dam, side flashing, and a drip edge where the door meets the porch or hardscape. On hillside-adjacent lots at the foot of the Santa Cruz Mountains, we also check grading so surface water doesn’t run back toward the door during the concentrated atmospheric-river storms. If the porch slab lacks a drip, we cut one in or add a retrofit drip cap. Call (866) 472-1908 for a free flashing assessment.
Service Areas Near Los Altos
We run Therma-Tru crews into Los Altos from our San Bruno base, and we cover the surrounding Peninsula communities as well. That includes Los Altos service area work across all three ZIPs, plus Therma-Tru service in Mountain View, Therma-Tru service in Loyola, and the nearby towns of San Bruno, South San Francisco, Millbrae, Burlingame, and Brisbane. Wherever you’re located on the Peninsula, we bring the same Therma-Tru installation discipline and moisture-management detail to every rough opening we set.
Book Your Therma-Tru Service in Los Altos Today
If your Therma-Tru door is cracking, leaking, or binding in Los Altos, call (866) 472-1908 for a free estimate. We’ll look at the door, the threshold, and the flashing, then give you a straight answer on repair versus replacement. Good construction doesn’t announce itself – it just works, year after year.
Written by Noel Carvalho, Owner at San Bruno Construction, serving Los Altos and the Peninsula since 1998.