Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Fast, Reliable Window Installation Across Los Altos
Window installation in Los Altos runs $850 – $2,400 for a standard single-window replacement, with bay windows and picture windows landing between $2,800 and $7,500 depending on size and framing. That’s the honest range you should expect from a licensed Los Altos contractor who writes the price down before work starts. Meridian Windows & Doors serves Los Altos homes with a disciplined process: we scope the opening, check the permit requirements, quote a fixed number, and install to manufacturer spec. Call (817) 686-2228 for a free estimate, and you’ll get a written price, not a ballpark.

We know Los Altos because we work here every week. The 1950s ranch houses off El Monte, the newer builds near the Country Club, the hillside lots above Foothill Expressway. Each neighborhood has its own window challenges, and we’ve learned them by doing the work, not by reading about it in a brochure.
Why Meridian Windows & Doors Is Los Altos’s Preferred Window Installation Company
Elliot Vance leads our window installation team, and he runs every Los Altos job on the same principle: the price goes on paper before a single screw turns, and the work is covered in writing for a full year. That’s the 365-Day Done Right Promise. If something fails within that period, we come back at no charge. No fine print, no labor exclusions. Homeowners who’ve been burned by a no-show contractor or a door-to-door price change tend to appreciate that.
We’re part of the Garrison Partners family, operating to The Garrison Standard since 2009. That means background-checked, uniformed technicians on every call. It means a live person answers the phone 24 hours a day, seven days a week, not a voicemail loop. And it means we carry eight manufacturer lines, so the window we spec for your Los Altos home is the right one for the job, not the one sitting in a warehouse.
Our Window Installation team has handled everything from fogged double-hungs in Old Los Altos to full bay window retrofits near Gardner Bullis School. We know which Los Altos neighborhoods trigger design review and which window replacements sail through with a simple permit. That local knowledge saves you time and keeps your project moving.
Picture Window in Los Altos
A picture window in Los Altos is a fixed, non-operating pane designed to frame a view, and in this town the views are often the whole point of the room. Homeowners along the hillsides above Foothill Expressway and around Rancho San Antonio frequently ask us to maximize glass area while meeting Los Altos’s energy code requirements. A typical picture window replacement in Los Altos runs $900 – $3,200 installed, depending on glass package and whether the existing frame needs replacement or can accept a direct-set retrofit.
The catch with picture windows is that Los Altos’s strict design guidelines in the Country Club and Old Los Altos neighborhoods mean visible changes to window openings can trigger design review. If you’re keeping the same rough opening and just replacing the unit, you’re usually fine. If you’re enlarging the opening, expect a more involved permit process.
Glass Packages for Los Altos Sun Exposure
West-facing picture windows in Los Altos take brutal afternoon sun from May through October. We regularly spec low-E glass, which is a thin coating that reflects heat while letting light through. For homes near Foothill Expressway, we often add a laminated interlayer for noise reduction. The combination gets you a quieter, cooler room without changing the window’s appearance.
When to Retrofit vs. Full Frame Replacement
If your picture window’s frame is sound and the flashing is intact, a direct-set retrofit saves money and avoids disturbing the surrounding stucco or siding. If the frame has rot or the rough opening has shifted, full frame replacement is the honest fix. We’ll tell you which one applies to your Los Altos home, and why.
Bay Window Installation in Los Altos
Bay window installation in Los Altos typically costs $3,500 – $7,500 and involves building or rebuilding a projecting window assembly that extends outward from the exterior wall. These are common in Los Altos dining rooms and living rooms, especially in the older ranch-style homes near Heritage Oaks Park. The work includes framing, support brackets or cantilever detail, roofing or flashing over the projection, and insulating the seat board and skirt.
Los Altos enforces a 45-foot height limit and strict single-story neighborhood design guidelines in areas like the Country Club and Old Los Altos. That matters for bay windows because a visible projection change can fall under design review. This contrasts with neighboring Palo Alto, where two-story additions are more common and height limits are less restrictive. If you’re adding a bay window where none existed, plan for a permit and possibly design review. If you’re replacing an existing bay, staying within the current rough opening keeps the process much simpler.

Structural Support and Seismic Anchoring
Bay windows in Los Altos need proper support, and that’s not a place to cut corners. We anchor the assembly to the floor system and brace it according to current seismic code. Los Altos sits in a high-seismic zone, and a poorly supported bay window will sag, separate at the seams, and eventually leak. We’ve repaired enough botched bay installs to know the failure modes firsthand.
Ventilation Options
Most Los Altos bay windows we install combine a fixed center picture unit with operable flankers, usually casements or double-hungs. That gives you the view and the cross-breeze. We’ll go over the options and the cost difference before any commitment is made.
Trusted Brands We Service in Los Altos
We’re authorized to install and replace products from PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux. For Los Altos homes, we frequently recommend CWS for their impact-rated and sound-dampening glass packages, and ES Windows for their clean modern sightlines that suit mid-century ranches without altering the original character. We stock common components for these lines locally, which means faster turnaround on Los Altos window replacements and fewer weeks waiting on a part from a distant distribution center.
Common Window Installation Problems We See in Los Altos Homes
- Ordering standard-sized windows without verifying the actual rough opening. Los Altos has thousands of homes built between 1940 and 1975, and those openings are rarely square or standard. Gaps lead to costly custom trim or re-framing. We measure every opening before we order a single unit.
- Failing to obtain a permit for window replacement. Los Altos’s building department strictly enforces residential alterations. We’ve seen stop-work orders and fines on projects where a homeowner tried to skip the permit. We pull permits when they’re required and handle the paperwork start to finish.
- Choosing impact-rated glazing without considering design pressure requirements. Impact-rated glass is heavier and requires frames rated for the wind and seismic loads specific to Los Altos. Spec the glass without checking the frame, and you get a window that may not meet structural code. We verify both.
- Ignoring the design review threshold. In the Country Club and Old Los Altos neighborhoods, visible window changes can require design review. Homeowners who skip this step can face a stop-work order mid-project. We check the guidelines for your specific address before we quote.
Pricing for Window Installation in Los Altos, CA
Here’s what you can expect to pay for window installation in Los Altos as of 2026. A standard double-hung replacement runs $850 – $1,800 per window installed. Casement windows run $950 – $2,100. Horizontal rollers and 3-panel sliders run $1,200 – $3,400. Picture windows run $900 – $3,200. Bay windows run $3,500 – $7,500. Garden windows run $2,200 – $4,800. These ranges include standard installation and basic trim. Costs rise if we uncover rot, need to reframe an opening, or if you choose higher-end glass packages like impact-rated or triple-pane low-E.
Every Los Altos project gets a written line-item quote before work begins. The price does not move at the door. Call (817) 686-2228 to schedule your free estimate, and you’ll see exactly what it costs before you commit to anything.
We Also Serve Cities Near Los Altos
Our Window Installation in Los Altos team also covers Mountain View, Stanford, Palo Alto, and Menlo Park. If you’re in one of those cities and need window installation, the same written pricing and 365-Day Done Right Promise applies. Call (817) 686-2228 and we’ll schedule your free estimate.
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 Installation in Los Altos
Yes, most window replacements in Los Altos require a permit, especially if you’re changing the size of the opening or altering the exterior appearance. Like-for-like replacements that stay within the existing rough opening may be exempt in some cases, but we verify that with the Los Altos building department before we quote. If your project falls under design review, in neighborhoods like Old Los Altos or the Country Club, we handle that submission as part of the job. Call (817) 686-2228 and we’ll check the requirements for your specific address.
We install and replace windows from PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux. For Los Altos specifically, we find CWS and ES Windows are strong fits because they offer impact-rated and low-E glass options that handle Los Altos sun exposure and Foothill Expressway noise. We’ll help you pick the right line for your home and budget. Call (817) 686-2228 to talk through your options.
A standard single-window replacement in Los Altos is typically a one-day job once the unit arrives. Bay windows and multi-window projects run two to four days depending on framing and finish work. The lead time for custom-sized windows ranges from two to six weeks depending on the manufacturer line you choose. We’ll give you a written timeline with the quote. Call (817) 686-2228 for specifics.
Yes, in most Los Altos homes you’ll see measurable savings, especially if you’re replacing single-pane aluminum windows in an older ranch. Low-E insulated glass reduces heat gain in summer and heat loss in winter. The exact savings depend on your window count, orientation, and existing insulation. We can walk you through realistic expectations during your free estimate. Call (817) 686-2228.
Yes, impact-rated windows with laminated glass are a practical way to cut noise from Foothill Expressway, El Camino Real, and the Caltrain corridor. The laminated interlayer dampens sound transmission while also providing impact resistance. It’s a real upgrade for Los Altos homes near major roads. Call (817) 686-2228 and we’ll spec the right glass package for your location.
Written by Elliot Vance, Owner at Meridian Windows & Doors, serving Los Altos since 2009.










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