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 Installation Across San Lorenzo
Window installation in San Lorenzo usually costs between $650 and $2,400 per window depending on the unit, the condition of the rough opening, and whether we’re pulling a rotted sill plate out with the old frame. Most Bohannon-era ranch homes here need more than a simple swap because the original steel casements and wood double-hungs have been fighting the coastal air for 75 years. We’ve been doing this work since 2009, and we know these blocks. Call (903) 354-7134 for a written quote before any work starts, and we’ll send someone who knows exactly what a San Lorenzo rough opening looks like once the trim comes off.
Why Westlight Windows & Doors Is San Lorenzo’s Preferred Window Installation Company
San Lorenzo homeowners tell us the same story over and over: another contractor gave a vague quote, missed the arrival window, or disappeared once the check cleared. That’s why we put the Kingswell Guarantee in writing on every job. You get a written price before we touch a single screw, a real arrival window, a clean job site, and a written guarantee when we finish. If a repair fails within the guarantee period, we come back and fix it at no charge. No phone tag, no negotiation.
Our window installation crews are background-checked and wear Westlight uniforms, so the person at your door is the person we said we’d send. When you call to schedule, a real human answers 24/7 – not a voicemail box, not a chatbot. And because we carry eight manufacturer lines including PGT, CGI, and CWS, we match the product to your Bohannon ranch’s rough opening rather than forcing you into whatever we happen to have on the truck. Owen Satterfield leads our San Lorenzo service area, and he holds every project to the 365-Day Done Right Promise: if the work isn’t right, we make it right.
Window Installers in San Lorenzo
Window installers in San Lorenzo work a different kind of job than crews in newer subdivisions. Most of our Window Installation work here starts with removing original steel or wood units from homes built between 1944 and 1955. The rough opening is rarely square, the sill pan is often rusted through, and the old frame has usually been painted shut three or four times over the decades. We factor all of that into the written price before we start.
Bohannon Tract Rough Openings
Because the Bohannon Organization built most of San Lorenzo from standardized floor plans, the rough openings repeat block to block. That means we can often pre-order casement and double-hung sizes once we’ve measured one home on the street. But the same repetition means we find the same failure mode: corroded steel casements and rotted rough sills under the original sill pans. Almost every job on these blocks becomes a sill-plate repair before the new unit goes in.
When Replacement Becomes Repair
A straightforward window installation in a San Lorenzo ranch usually turns out to be a repair job first. We probe the rough sill, check the jambs for rot, and square the opening before we set the new unit. If we skip that, the new window might seal against the coast today but fail in a season or two. That’s the difference between a contractor who just swaps glass and one who does the job right.
Casement Windows in San Lorenzo
Casement windows in San Lorenzo are the most common original unit in the Bohannon tracts, especially the steel-frame casements that came with the 1944 to 1955 ranch stock. A single casement replacement here typically runs $700 to $1,900 installed, though the price climbs when the rough sill underneath needs cutting out and sistering. We recommend low-e insulated glass for these units because it blocks heat transfer in summer and holds warmth in winter.
Steel Casement Failure in the Bohannon Homes
The original steel casement frames corrode at the corners faster here than almost anywhere else in the East Bay because the marine layer sits over San Lorenzo so often. Salt-laden air off the southern Bay gets into the steel at the corners and the hardware binding the sash. Once corrosion starts, the casement binds, then seizes, then the homeowners paint it shut to stop the draft. By the time we get to it, the unit often won’t open at all without cutting the hinges free.
Replacing Painted-Shut Casements
When the old casement won’t open, we cut the hinges and lift the sash out of the frame, then remove the steel frame from the rough opening. Often the rough sill underneath has been holding water under the old sill pan long enough to rot. We cut out the bad section and sister new sill plates, then set the new casement and flash it correctly. It takes longer than a simple swap, but the new unit opens and closes properly and won’t wick moisture back into the frame.
Trusted Brands We Service in San Lorenzo
We install PGT and CGI impact-rated windows for San Lorenzo homeowners who want storm protection and lower noise from the BART corridor along Hesperian Boulevard. We also carry CWS for high-efficiency casements and double-hungs that fit the standardized Bohannon rough openings well. Because we stock local parts and have crews working San Lorenzo weekly, we can usually match a specific brand and model to your home without waiting on a special order from across the country. If a warranty claim comes up, we handle it directly – you don’t chase the manufacturer.
Common Window Installation Problems We See in San Lorenzo Homes
- Rotted rough sill plates under original steel casements. The sill pans on the Bohannon-era steel units held standing water for decades, and the wood underneath rots until a screwdriver sinks into it with no resistance. We cut out and sister new plates before setting the new window.
- Out-of-square rough openings from decades of settling. The 1944-to-1955 ranch homes have shifted over time, and many rough openings are no longer square. A standard pre-ordered size often needs shimming or custom trimming to seal tight against the marine air.
- Corroded steel frames painted shut multiple times. The original casements bind as the steel corners rust, and the standard fix was more paint. By the time we arrive, the sash often won’t move at all without cutting the hinges free.
- Salt-laden coastal air accelerating corrosion on new hardware. The marine layer that settles over San Lorenzo doesn’t reach Livermore or the inland Tri-Valley the same way. Flashing and drainage details on these blocks need to be done right or the new hardware starts corroding within a few seasons.
Pricing for Window Installation in San Lorenzo, CA
For a San Lorenzo ranch home, budget roughly $650 to $1,200 per unit for a standard double-hung or single-hung window, $700 to $1,900 for a casement, and $900 to $2,400 for a 3-panel sliding or 3-lite roller window. If the rough sill needs repair – and on the Bohannon tracts it usually does – add $80 to $300 per opening depending on how much framing we have to cut out. These are the real numbers we quote, not teaser prices we bump at the door. Call (903) 354-7134 to schedule a free estimate, and we’ll hand you a written price before any work begins.
We Also Serve Cities Near San Lorenzo
Westlight Windows & Doors handles Window Installation in San Lorenzo and the surrounding East Bay communities, including Castro Valley, San Leandro, Union City, and Oakland. If you’re a few blocks outside the village or just over the line into the unincorporated county, we’ll still come out and give you the same written price and written guarantee
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, for most Bohannon-era floor plans we can pre-order standard casement and double-hung sizes once we’ve measured one home on your street, because the rough openings repeat across the tract. But we always measure the actual opening before final order, because decades of settling often leave the rough opening a quarter-inch to half-inch out of square, and the last thing you want is a unit ordered to a spec that won’t seal. Give us a call at (903) 354-7134 and we’ll walk you through which units can be pre-ordered and which need a site measure first.
The original steel casement windows on San Lorenzo’s Bohannon ranches had sill pans that held water, and over 75 years that standing water rotted the rough sill plate underneath. When we pull the old steel frame, we usually find the wood below is soft or completely gone. We cut out the bad section and sister in a new sill plate before setting the new unit – skipping that step means the new window sits on rot and fails within a couple of seasons. The written quote we give you lists the sill repair as a line item if we find it before we start.
Yes. San Lorenzo sits close enough to the southern Bay that the summer marine layer pours over the community while inland cities like Livermore stay hot and dry. The salt-laden air saturates wood jambs and sash, and it corrodes steel and aluminum hardware years before the same parts inland show any wear. That’s why we flash and seal San Lorenzo windows differently than we would in the Tri-Valley. For an exact quote on your home, call (903) 354-7134.
Usually yes. The repetition is the defining feature of the Bohannon tracts: the same floor plan, the same rough opening sizes, and the same failure modes. If one steel casement has corrod