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 San Lorenzo
Window installation in San Lorenzo typically runs $850 – $2,400 per window for a standard retrofit, and most homes here need work that goes beyond swapping glass, because the 1950s tracts off Hesperian Boulevard were never built for modern seismic code. A full-frame replacement in an older ranch off Bockman Road or Via Alamitos usually lands between $1,900 and $3,600 per opening when the existing jamb has rotted or the shear strapping needs restoration. We handle the scope right the first time, at a written price you see before the first screw turns. Call (817) 686-2228 and we’ll walk the job with you.

Why Meridian Windows & Doors Is San Lorenzo’s Preferred Window Installation Company
San Lorenzo homeowners don’t get a sales pitch from us. They get Elliot Vance and a crew that has worked the same block of Hesperian Boulevard and the neighborhoods around Arroyo High School enough times to know what’s behind the drywall before we touch it. That local knowledge matters here, because nearly all of San Lorenzo sits in Alquist-Priolo seismic zones, and a window that looks fine from the curb may have a jamb that stopped doing its structural job years ago.
Our Window Installation team carries eight manufacturer lines so we spec the right glass for a non-HVHZ city, not whatever is stacked in a warehouse. Every quote is written, and every install is covered by the 365-Day Done Right Promise: if it fails within a year, we come back at no charge. No fine print about labor exclusions. That’s the Garrison Standard, and it has been since 2009.
Window Contractor in San Lorenzo
A window contractor in San Lorenzo is the person who reads the full scope before any glass gets ordered. We check the rough opening, the existing shear path, the sill condition, and whether the plaster returns match the new jamb depth. In San Lorenzo specifically, that means looking for the diagonal let-in boards used in 1950s framing instead of the modern shear panels you’d find in newer construction three miles down the road.
Seismic-Ready Rough Openings
Because San Lorenzo sits on expansive Bay Area clay and within mapped seismic zones, we recheck every rough opening after any excavation settles, before final shimming. A clay shift of even a quarter inch can rack a new sash and bind a casement. We strap and re-strap jambs to current zone detail, and we document it for the inspector.
Title 24 Glass Specs
Some San Lorenzo homeowners assume “impact-rated glazing” satisfies Title 24. It doesn’t. The label that matters here is the insulated glass unit with a SHGC and U-factor that matches the permitted spec. We pull that spec and put the numbers on your quote, because that’s what the building department checks.
Window Installers in San Lorenzo
Window installers in San Lorenzo do more than set a unit in caulk and walk away. They restore the wall’s shear path when an old jamb has failed, install a proper sill pan where none existed, and flash the opening so Bay Area marine fog and afternoon Delta winds don’t drive moisture behind the frame. That’s the difference between a warranty and a callback, and our installers are background-checked and uniformed on every call.
Jamb and Shear Restoration
In the Lorin Eden neighborhood off Hesperian Boulevard, a 1950s ranch still had its original single-pane double-hung units, and our tech found the walls were braced with diagonal let-in boards rather than modern shear panels. We replaced the old sash and jambs with low-E insulated glass units, restoring the shear path with new straps and a proper sill pan, and when fogging showed up in one sealed unit six weeks later, our installer came back on the manufacturer’s product warranty. The result is a quieter, lower-SHGC interior that no longer cooks the west-facing bedrooms by mid-afternoon.
Sill Pans and Flashing
Expansive San Lorenzo clay moves after excavation, so we check the opening again before trim. A missing sill pan here means water wicks behind the jamb and rots 1950s-era framing. We install the pan, flash the nailing flange, and seal the exterior with a compressive sealant rated for our fog cycles.

Trusted Brands We Service in San Lorenzo
We’re authorized to install and replace products from PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux. For San Lorenzo homes, PGT and CGI win a lot of jobs because their insulated glass units hold a low SHGC without driving the cost past what a 1,100-square-foot ranch can justify. CWS and ES Windows come up often on casement and awning replacements. We stock local parts so San Lorenzo customers aren’t waiting on a freight truck from Texas for a sash balance or a hinge.
Common Window Installation Problems We See in San Lorenzo Homes
- Expansive clay racking openings after excavation. San Lorenzo’s clay moves when it gets wet, and a rough opening that measured square in February can bind a new casement by May if you don’t recheck before shimming.
- Marine fog exposing missing sill pans. Bay fog and afternoon Delta winds push water at any gap, and a 1950s jamb with no pan will rot inside five years.
- Title 24 confusion on glass labels. Homeowners shop for “impact windows” and get a unit that doesn’t carry the SHGC and U-factor the permit requires. The inspector catches it, and the window comes out.
- No shear strapping in original jambs. Older San Lorenzo tracts used diagonal let-in boards instead of shear panels, so a full jamb replacement without new straps leaves a structural hole in the wall.
Pricing for Window Installation in San Lorenzo, CA
Here are honest ranges for this market: single-hung and double-hung retrofit windows run $850 – $1,700 per unit installed. Casements and awnings run $1,100 – $2,100. Picture and fixed windows run $700 – $1,800. Bay and bow windows start around $3,200 and go to $7,500 depending on seat depth and roof flashing. A full-frame replacement with jamb restoration adds $900 – $1,600 per opening because we’re fixing structural work the original builder skipped. The price we write goes on paper before work starts, and it does not move at the door. Call (817) 686-2228 for a free estimate, and you’ll get a line-item quote you can keep.
We Also Serve Cities Near San Lorenzo
Our crews work locally in San Lorenzo and also cover Castro Valley, San Leandro, Union City, and Oakland. If you’re in one of those cities and want the same written pricing and the same 365-Day Done Right Promise, call the number and we’ll schedule a walkthrough.
Serving San Lorenzo, CA - Our Local Coverage Area
We’re based in the San Lorenzo 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 San Lorenzo
Yes. San Lorenzo falls under Alameda County’s building jurisdiction, and a permit is required any time the rough opening is altered or the jamb is replaced. A simple retrofit swap in an existing frame may not require one, but a full-frame replacement with shear strap work does. We pull the permit, schedule the inspection, and stand at the rough opening for the final sign-off. Call (817) 686-2228 for an exact scope on your street.
Because the wall tells us what the original builder didn’t. A missing sill pan, rotted jamb, or absent shear strap is common in 1950s San Lorenzo tracts, and the fix must be made before we hang the new window. We write the original quote honestly, but when we open the wall and find a structural repair, we show you photos and hand you a written change order before any work continues. That way the answer to “will the price move” is yes, but only with your signature, never at the door.
Yes, when the glass spec is right. San Lorenzo sees heavy afternoon sun on west-facing bedrooms, and replacing single-pane double-hungs with low-E insulated glass units with a SHGC around 0.25 or lower cuts the heat load measurably. The key is the label: the unit must carry the SHGC and U-factor that your permit specifies. Install a unit without that label and you’ve spent money on marketing, not physics. Call us at (817) 686-2228 and we’ll spec the right glass for your exposure.
A standard retrofit window takes one day per opening once materials are on site. A full-frame replacement with jamb and shear restoration typically runs two to three days per floor, and a whole-house job in a 1950s ranch off Via Manzanas is usually a week. Bay windows add a day for seat framing and roof flashing. We set the calendar before we start and we hold it. Call (817) 686-2228 for a written schedule.
Yes, all four. PGT and CGI are our most common picks for San Lorenzo because they make insulated glass units that balance SHGC against cost on a ranch house. CWS and ES Windows come up on casement and awning orders where the opening is narrow and the sash needs a specific crank geometry. We stock parts locally so warranty work doesn’t wait on a shipment. Call (817) 686-2228 and we’ll spec the right line for your windows.
Written by Elliot Vance, Owner at Meridian Windows & Doors, serving San Lorenzo since 2009.










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