Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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AfterFast, Reliable Window Replacement Across Los Altos
Window replacement in Los Altos typically costs $900 – $2,800 per window installed, with most full-frame jobs landing between $1,400 and $2,200. The price difference comes down to whether you’re doing an insert swap or tearing out to the studs, which matters a lot in this town because so many homes date to the 1950s and 60s. Sean Mackey and the crew at Juniper Windows & Doors know exactly what those older Los Altos frames hide, and we quote the scope honestly before the first screw turns. Call (682) 281-2168 for a written line-item price on your project.
Key takeaways:
- Full-frame replacement in Los Altos: $1,400 – $2,800 per window, depending on jamb depth and header work
- Insert replacement in Los Altos: $900 – $1,800 per window when the existing frame is sound
- Los Altos pulls permits on most replacements, and street-facing elevations often route through design review
- Every Juniper job gets a written price before work starts, backed by the 365-Day Done Right Promise
Why Juniper Windows & Doors Is Los Altos’s Preferred Window Replacement Company
We’ve worked on enough Los Altos ranchers and mid-century builds to know that the easy-looking jobs rarely are. A 1962 original frame near Almond School isn’t the same as a 1990s tract home off Foothill Expressway, and the difference shows up the moment you remove the old sash. That’s why our Window Replacement team walks every Los Altos job with a scope-first mindset: we measure jamb depth, check the header, confirm the rough opening, and then price the work in writing. No one opens your wall and discovers the price changed.
Our Los Altos customers tell us the same thing again and again: they’d rather get a real number on paper than a vague estimate that shifts at the door. We run on that principle. Founded in 2001 as part of the Relay Home Co. family, Juniper Windows & Doors gives every homeowner a written price before work begins, plus live arrival times, before-and-after photos, and a digital invoice. If something isn’t right within a year of install, the 365-Day Done Right Promise covers it in writing, parts and labor. Sean Mackey holds every Los Altos project to that standard personally.
Window Glass Replacement in Los Altos
Window Glass Replacement in Los Altos means swapping the failed insulated glass unit (IGU) while keeping your existing frame and sash. We do this most often on homes near downtown Los Altos where the frames are still square but the seals have blown, leaving fog between the panes or condensation you can’t wipe away. A typical glass-only replacement here runs $350 – $750 per window depending on size and whether you’re upgrading to Low-E or laminated glass.
When the Glass Is Worth Saving
An older wood frame with good bones can outlast the glass inside it. If your sash moves cleanly and the frame shows no rot or racking, replacing just the IGU saves thousands compared to a full-frame job. We order the new unit to the exact thickness of your existing sash pocket, so the glass seats properly without shimming or gaps.
Upgrading to Low-E and Laminated Glass
Los Altos gets real afternoon sun from the west, especially along the El Monte corridor, and single-pane glass from the Eisenhower era does almost nothing to stop it. A Low-E IGU tuned for the Peninsula’s mild climate cuts summer heat gain without over-insulating against winter sun you actually want. For street-facing windows on busy roads, we recommend a laminated interlayer, which holds the glass together if impact ever happens and adds meaningful sound dampening.
Window Sash Replacement in Los Altos
Window Sash Replacement in Los Altos addresses the moving parts of the window, the sash itself, without tearing out the frame. When your double-hung won’t stay open, the counterweights or springs have failed, or the wood sash has swelled and cracked from decades of Peninsula morning fog, replacing the sash costs $450 – $1,100 per window. The frame stays in place; the operating assembly gets replaced.
Swapping Sash While Keeping the Look
In older Los Altos neighborhoods like the Shasta area and near Heritage Oak, the window grid pattern and sightlines are part of the home’s character. Sash replacement lets you keep the original frame profile and trim while getting modern glass and hardware. We match the sash profile to your existing jamb depth so the new sash closes flush and locks properly.
When the Frame Is Too Far Gone
Sometimes sash replacement is off the table because the frame itself is rotted or racked. That’s not a failure of the sash. It’s a structural problem. If moisture has eaten the sill or the frame has shifted enough that a new sash won’t seat square, a full-frame replacement becomes the only way to get a sealed, operable window. We’ll show you the measurements and explain the threshold before you spend anything.
Trusted Brands We Service in Los Altos
We stock parts and order glass for PGT, CGI, and CWS window lines, which covers most of what’s installed in Los Altos homes from the 1990s forward. If you’ve got ES Windows or another premium line, we’ll source it. Having a local parts pipeline matters here because lead times on custom glass can stretch, and we’d rather get your Los Altos job done in weeks, not months. Tell us the brand and the rough measurements and we’ll give you a real price range on the spot.
Common Window Replacement Problems We See in Los Altos Homes
- Blown seals on original single-pane-to-IGU swaps. Homes near Magee Avenue and along Edith Avenue often had early retrofit work done in the 1980s, and those early IGUs are reaching end of life. Fogged glass is the surest sign.
- Jamb depth that won’t accept modern glass. A 1960s ranch near Loyola Corners was framed for 3/4-inch single pane, not 7/8-inch insulated glass. Forcing the thicker unit into the old jamb means the sash won’t seat, or worse, the trim line puckers. We plane and shim to hit both the design pressure and a flush exterior line.
- Design-review triggers on street-facing windows. If your replacement changes the visible sash profile or color on a front elevation, the Los Altos building department routes it through design review. We flag this before quoting, not after demo.
- Wrong solar heat-gain tuning for the Peninsula. Glass ordered for an inland climate overperforms on cooling and underdelivers on winter heat gain. Los Altos sits on the mild side of the Bay, and the glazing spec should reflect sun angles specific to this latitude, not a generic “energy efficient” pick.
Pricing for Window Replacement in Los Altos, CA
Here’s what we tell Los Altos homeowners straight: a typical insert replacement runs $900 – $1,800 per window, and a full-frame replacement runs $1,400 – $2,800. The variables are jamb depth, header condition, glass package, and whether the window faces the street and triggers design review. A 1,800-square-foot mid-century ranch needing eight full-frame replacements is a $12,000 – $22,000 project in Los Altos. A simpler glass-only swap on a few fogged units might land under $2,500 total. Every Juniper job receives a written price before work starts, and that price doesn’t change unless you change the scope. Call (682) 281-2168 for a free estimate and a line-item quote you can actually plan around.
We Also Serve Cities Near Los Altos
We handle window replacement in Los Altos and nearby: Mountain View, Stanford, Palo Alto, and Menlo Park. If you’re just outside Los Altos proper, we still cover the work under the same written-price and warranty terms. Our scheduling runs through the San Francisco Bay Area office, and crews dispatch locally to Los Altos addresses every week.
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 About Window Replacement in Los Altos
Yes, in most cases. The Los Altos building department reviews window replacement permits, and if the work changes the visible sash profile, color, or glazing pattern on a street-facing elevation, it routes through the city’s design-review process rather than an over-the-counter sign-off. Frame-for-frame swaps on rear elevations are usually simpler. We handle the permit scope for every Los Altos job and we’ll tell you upfront which path yours takes before you commit. Call (682) 281-2168 to walk through your specific elevation.
Most Los Altos projects run four to eight weeks from signed contract to final inspection. Glass fabrication typically takes two to four weeks once the exact jamb depths and glass specs are confirmed, and installation on a whole home runs three to five working days. If your job triggers design review, add two to four weeks for the city’s plan check. We build that calendar into your written quote so you know the real timeline before you sign. Call (682) 281-2168 for a schedule specific to your project.
Three things: jamb depth, header condition, and whether the window faces the street. Older Los Altos ranchers were often framed for single-pane sash, so installing a modern insulated unit may require planing, shimming, or reframing the rough opening. Header work adds real cost. Street-facing elevations add design-review time. The fourth variable is glass package: a Low-E IGU with a laminated interlayer costs more than a standard Low-E unit, but earns it back in comfort and sound reduction. Call (682) 281-2168 to get a written breakdown for your windows.
Only the scope you approve after we open the wall. If the header is undersized, rotted, or missing entirely, that’s a change order we show you with its own line-item price before we touch it. Same with rot in the sill or jamb that wasn’t visible during the initial scope. We don’t work on allowance-based pricing, so the only changes come from actual conditions we photograph and show you in writing. Call (682) 281-2168 and we’ll explain exactly how change orders work on a Los Altos job.
Yes, if your sash is square, sound, and the frame isn’t rotted. We do glass-only replacement on Los Altos homes all the time, particularly when the frames are original wood that’s still in good shape but the seals have failed. We order the new IGU to match your exact sash pocket thickness, so the glass seats properly without shims or gaps. It’s the most cost-effective fix when the frame is fine. Call (682) 281-2168 and we’ll tell you whether your sash qualifies.
Get Your Los Altos Window Replacement Scoped and Priced in Writing
Sean Mackey and the Juniper Windows & Doors crew serve Los Altos with the same standard on every job: a written price before work starts, live arrival times, photo updates, and a 365-Day Done Right Promise in writing. If a repair fails within the year, we come back free, no argument. Call (682) 281-2168 to schedule your free Los Altos window replacement estimate. A real person answers, every time.
Written by Sean Mackey, Owner at Juniper Windows & Doors, serving Los Altos since 2001.