Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Sliding glass doors
Impact garage doorsPGTCGI
Before
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AfterFast, Reliable Window Installation Across San Lorenzo
Window installation in San Lorenzo, CA typically runs $850-$1,900 per opening for full-frame replacement on a 1945-1960 tract home, with most standard double-hung units landed between $1,100 and $1,600. We’re TruePane Windows & Doors, and we’ve been setting windows in these exact postwar floor plans long enough to know what we’ll find behind the trim before we pull it. If you’re on Via Manzanas, Paseo Grande, or anywhere in the 94580, call (888) 635-0804 and a live person will answer. We’ll schedule a free estimate, measure every opening twice, and put the numbers on paper before any work begins.
Why TruePane Windows & Doors Is San Lorenzo’s Preferred Window Installation Company
San Lorenzo homeowners tend to keep their houses for decades. They remember the contractor who set a window out of plumb in 1987 and left a door that binds every August. We get called in after that, and we fix it. Dale Kessler founded TruePane in 2008 on a rule that still governs every install: if the pane is not true, the job is not done. That’s not a slogan. It’s the standard our crews check against on every opening, every time.
We’re not a franchise playbook. We’re a second-generation glazier’s company that trains apprentices into journeymen and sponsors county fairs and church roof funds because we plan to be in San Lorenzo in thirty years. A live person answers our phone 24 hours a day, 7 days a week. Not a voicemail tree, not a callback form. Background-checked, uniformed technicians show up when we say they will, measure twice, and register both warranty layers before the truck leaves your driveway. That’s The Keystone Standard, and it’s in writing on every job.
Key Takeaways
- San Lorenzo’s 1945-1960 tract homes share a few standard window rough-opening sizes, but clay-soil movement means nearly every opening has shifted out of square and needs custom shimming and re-squaring.
- Salt air off San Francisco Bay corrodes original aluminum frames and hardware, making full-frame replacement more common here than in inland East Bay cities.
- TruePane quotes manufacturer lines side-by-side on paper so you see exactly what you’re buying, and the Done Right Promise means if it’s not done right, we make it right.
- Call (888) 635-0804 for a free estimate. A live person answers.
Our Window Installation Services in San Lorenzo
San Lorenzo’s housing stock is overwhelmingly minimal-traditional and ranch-style tract homes built between 1945 and 1960. We install every window type these homes require, and we stock the parts and hardware that this specific housing stock demands. Each job includes full-frame removal, re-squaring as needed, perimeter flashing, and manufacturer warranty registration on the spot.
Casement Windows
Casement windows are common on San Lorenzo’s original tract homes, and they’re also the style most damaged by decades of marine air. The aluminum sashes corrode white, the crank hardware seizes, and the operator arms snap when someone forces a stuck sash. We replace them with new casement units using marine-grade hardware and stainless steel fasteners, because inland-spec hardware fails within ten years here. A typical casement replacement in San Lorenzo runs $1,200-$2,200 per opening depending on size and glass package.
Single & Double Hung Windows
Double-hung windows are the workhorse of San Lorenzo ranch homes. The original single-pane aluminum units lose their counterbalance springs, the sashes bind against corroded tracks, and condensation from San Lorenzo Creek moisture fogs the glass. We set new double-hungs with low-E glass, argon fill, and full perimeter flashing. Standard double-hung replacement in San Lorenzo runs $950-$1,750 per opening.
Sliding Windows
Sliding windows on San Lorenzo homes sit in exterior walls that have settled on expansive clay soil for 70 years. The tracks rack, the rollers wear unevenly, and the sashes drag. We pull the old unit, re-square the rough opening with custom shims, and set a new slider on a level, true opening. Sliding window replacement in San Lorenzo runs $900-$1,800 per opening, with larger three-lite units running higher.
Fixed & Picture Windows
Fixed and picture windows are common on San Lorenzo’s front elevations, where homeowners want clear sightlines without moving parts. The original aluminum frames on these units suffer the same salt corrosion as every other window, plus seal failure from decades of thermal cycling. We install new fixed units with low-E or laminated glass, properly flashed and trimmed to match the home’s original character. Fixed window replacement in San Lorenzo runs $700-$1,600 per opening.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Lorenzo
TruePane is an authorized installer for more than a dozen manufacturer lines, including, PGT, CGI, and ES Windows. For San Lorenzo’s coastal air and soil conditions, we regularly specify PGT and CGI for impact-rated builds, and Marvin or Milgard for wood-clad and fiberglass options that hold up against salt. We quote manufacturer lines side by side on paper so you can see the price gap between a basic aluminum package and a marine-spec fiberglass or wood-clad unit. Our crews carry common hardware, shims, and flashing materials for San Lorenzo homes on the truck, which means less waiting on parts and fewer second appointments.
Common Window Installation Problems We See in San Lorenzo Homes
- Salt-corroded original aluminum frames. Marine air off San Francisco Bay pits and corrodes 65-75-year-old aluminum sashes, making them bind or seize within 10-20 years of the first signs of corrosion. We see this on nearly every original window still in place in San Lorenzo.
- Out-of-square rough openings from clay soil movement. San Lorenzo sits on expansive clay that shifts with seasonal moisture. Foundations settle, walls rack, and window openings drift out of plumb. Install a stock replacement unit without re-squaring and the new frame flexes, leading to stress cracks and early seal failure.
- Rotting wood sills and thresholds from San Lorenzo Creek moisture. Humidity from the creek and bay holds moisture against wood sill plates and exterior door thresholds. By the time we pull an original window, the sill often shows rot at the corners and along the bottom edge.
- Failed single-pane seals and condensation. Original single-pane units in San Lorenzo were never meant to last 70 years. When the glazing compound dries out and the seals fail, moisture fogs between panes or collects on the interior glass during winter mornings. This is a replacement job, not a repair.
Pricing for Window Installation in San Lorenzo, CA
Here’s what San Lorenzo homeowners should expect to pay, in writing, before any work starts. A standard double-hung replacement runs $950-$1,750. Casement windows run $1,200-$2,200. Sliding windows run $900-$1,800. Fixed and picture windows run $700-$1,600. Bay and bow units, which involve structural support changes, start around $2,500 and go up depending on size and projection.
What moves the price in San Lorenzo specifically: whether the rough opening is out of square and needs full-frame shimming (most do), whether the original sill shows rot and needs replacing, and whether you choose a marine-spec frame material like fiberglass or wood-clad over basic aluminum. The cheap spec costs more within a decade. Stainless hardware, marine-grade finishes, and sealed joints cost more up front and fail far slower. Call (888) 635-0804 for a free estimate. We’ll measure, write the quote on paper, and register both warranty layers before the truck leaves your driveway.
| Window Type | Typical San Lorenzo Price Range (per opening) |
|---|---|
| Double & Single Hung | $950-$1,750 |
| Casement | $1,200-$2,200 |
| Sliding | $900-$1,800 |
| Fixed & Picture | $700-$1,600 |
| Bay & Bow | $2,500+ |
We Also Serve Cities Near San Lorenzo
Our crews work throughout the East Bay flatlands. If you’re in Castro Valley, San Leandro, Union City, or Oakland, we handle those the same way we handle San Lorenzo: square openings, marine-spec materials, and a written quote before work starts. See our Window Installation page for full service details, or read more about local work in San Lorenzo.
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 - Window Installation in San Lorenzo
Because the housing stock is old, uniform, and built on shifting clay. San Lorenzo is one of the East Bay’s most intact postwar planned communities, built almost entirely between 1945 and 1960. Those original single-pane aluminum windows are now 65-75 years old, corroded by salt air, and set in rough openings that have racked out of square from decades of clay-soil foundation movement. That combination means patching or retrofitting doesn’t work. Full-frame replacement with re-squaring is the only method that holds up. Call (888) 635-0804 for an exact quote on your openings.
Fiberglass and wood-clad units hold up best. Aluminum, especially the original 1950s spec, corrodes white within a decade or two of constant marine exposure. Fiberglass doesn’t corrode, and wood-clad units with aluminum exterior cladding give you a wood interior with a corrosion-resistant exterior. We quote PGT, Marvin, and Milgard fiberglass and wood-clad options side by side on paper. Estimates are free.
Put a level against the interior edge of the window frame on all four sides. If the bubble isn’t centered, the opening has shifted. You’ll also notice sashes that bind at the top but gap at the bottom, or cracked corners on newer replacement units that were never fully shimmed. If you’re on the Alameda County flatlands, the answer is almost always yes. We measure every opening twice before quoting. Call (888) 635-0804 to schedule a free estimate.
Because the marine layer brings humidity, not just cool air. Low-E coatings reduce condensation on interior glass during damp winter mornings, and argon fill slows heat transfer through the pane. San Lorenzo’s mild climate doesn’t mean low-E is unnecessary. It means you need the right low-E coating for a coastal climate. We specify low-E and argon on every replacement unit we quote for San Lorenzo homes.
That’s a failed seal. The insulating gas has escaped and moisture has entered the space between the panes. On original single-pane units, it’s the glazing compound that has failed. Either way, the fix is replacement, not repair. Fogged glass cannot be cleaned from inside the sealed unit. Call (888) 635-0804 for a free estimate on replacement. We’ll measure, quote, and handle the entire job from removal to trim.
On Via Manzanas, our crew pulled a first-generation casement window from a 1952 ranch where the aluminum sash had corroded white from decades of salt air off the Bay. The rough opening was racked nearly 3/8 inch out of plumb, so after full-frame removal we re-squared with custom shims, set a new Marvin double-hung with low-E glass and argon fill, and flashed the entire perimeter with tape before trimming. That’s the job San Lorenzo requires, and it’s the job we do.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving San Lorenzo and the East Bay.