Single hung
Double hung
Horizontal roller
Casement
Bay & bow
Sliding glass doors
Entry doors
Impact garage doors
PGT
CGIFree in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Get your free estimateFast, Reliable Window Installation Across Lafayette
Our Window Replacement in Lafayette usually means retrofitting an older hillside ranch, not just swapping glass. Most quotes run $850 – $1,900 per opening for standard dual-pane replacements, and $2,200 – $4,800 per opening when hidden framing or waterproofing corrections surface after the old unit comes out. The bigger number isn’t a surprise if your installer told you the truth upfront, and that’s exactly how our crew works. Call (831) 480-4124 and we’ll walk the house with you, open a few windows, and write down what we actually see before any price is put on paper.
We send uniformed, background-checked technicians into Lafayette every week, from Reliez Valley Road up through Happy Valley and over to Burton Valley. They know these homes. They know what’s behind the stucco on a 1963 split-level. And they know that a quote that skips the rot, the failed flashing, and the undersized framing is a quote that’s going to get bigger the minute the wall is open. We’d rather show you the real number the first time.
Key Takeaways
- Typical window replacement in Lafayette runs $850 – $1,900 per opening for standard dual-pane work.
- Openings with hidden framing, flashing, or wiring corrections run $2,200 – $4,800 depending on exposure and permit scope.
- Every job gets a written price before any work starts, no exceptions.
- Our 365-Day Done Right Promise covers every install, not just the easy ones.
- We stock parts for PGT, CGI, Therma-Tru, and ViewLux products locally for faster turnarounds.
Why Lightwell Windows San Francisco Is Lafayette’s Preferred Window Installation Company
Lafayette homeowners call us because our technicians show up knowing the difference between a 1958 ranch on a south-facing slope in Happy Valley and a 1974 split-level off St. Mary’s Road. That matters when you’re deciding whether to replace just the sash or pull the whole frame. The original aluminum units on many of these homes have lost their anodized coating, corroded at the weep holes, and started leaving white oxidation streaks down the stucco. We see it constantly. We know what’s underneath before we open it.
Our Window Installation team handles everything from single openings to whole-house retrofits with casement, awning, picture, and sliding configurations from eight manufacturer brands. We carry PGT, CGI, CWS, ES Windows, ECO Window Systems, Mr-Glass, Therma-Tru, and ViewLux. That matters in Lafayette because the right recommendation for a west-facing wall above Highway 24 is not the same as the right pick for a shaded north bedroom overlooking the creek.
Every visit starts with shoe covers and drop cloths before a single tool comes out. Every quote is written down before any work begins. When the job is done, we photograph the clean-up and walk the opening with you. The C.A.R.E. values aren’t a poster in our shop, they’re how the crew behaves on your property: Clean up like it’s our own home. Ask before we move or touch anything. Respect your time and your quiet hours. Explain the price before the work. Keith Yamada runs this operation with that standard on every single job, and a live person answers the phone at (831) 480-4124 twenty-four hours a day, seven days a week.
Styles & brands we work with
Window Installers in Lafayette
Window Installers in Lafayette spend most of their time on retrofit work, not new construction, because this city’s housing stock was largely built between 1955 and 1985. That means we’re pulling original aluminum or single-pane wood units out of custom ranch and split-level homes where the openings are rarely square, the framing is often undersized by today’s code, and the waterproofing has been failing quietly for decades. A typical single-opening retrofit runs $850 – $1,900 here, and the labor is usually completed in half a day if the surrounding wall is sound.
Structural Discovery During Pull-Out
When we pull an original aluminum slider from a 1960s hillside ranch, we’re looking at framing that may have been built to older standards. Rotted king studs, sagging headers, and missing shear nailing are common. We carry dimensional lumber and engineered corrections on the truck, but we photograph what we find, show you, and get written approval before fixing anything that wasn’t in the original quote.
Waterproofing and Flashing Corrections
Lafayette’s winter storms drive rain against west and south exposures with real force. Failed building paper, missing sill flashing, and corroded weep systems let that water into the wall cavity behind the window. Our installers rebuild those penetrations with proper membrane, flashing tape, and sloped sills so the new unit drains the way the manufacturer intended, not into your framing.
Casement Windows in Lafayette
Casement Windows in Lafayette are one of the most requested replacements because the original homes of the 1950s through 1970s often featured wide picture units flanked by small casement vents. Those original casements had steel or aluminum operators that have seized from decades of thermal cycling between hot dry summers and cold wet winters. A new dual-pane, low-E casement replacement in Lafayette typically runs $900 – $2,100 per opening, depending on size and whether the surrounding frame needs correction.
Clean Sightlines for Hillside Views
Lafayette homeowners pay for views, and casement windows offer the least obstructive frame of any venting window style. Our team has installed ES Windows and PGT casements with narrow profiles that match the clean sightlines of the original aluminum units while delivering dual-pane thermal performance the old frames never had. If you’re looking down the hill toward the reservoir from Happy Valley, you don’t want a thick vinyl mullion in your photograph.
Hardware That Holds Up to Wind and Sun
Afternoon winds from the Carquinez Strait test window hardware here more than people realize. We spec operators, hinges, and multi-point locks rated for constant exposure, and we set the sash at the correct reveal so it doesn’t bind in August or whistle in January. A casement that opens with one hand and closes flush against the seal is the whole point of this style.
Trusted Brands We Service in Lafayette
Our Window Installation in Lafayette work includes factory-certified installation across eight brands, so we’re not married to one vendor. For Lafayette’s hot west-facing exposures, we often recommend PGT or CGI impact-rated dual-pane units; for clean modern sightlines on mid-century homes, ES Windows and ViewLux do the job beautifully. We keep common sealants, operators, and replacement parts for Therma-Tru, PGT, and CGI locally accessible, so when a Lafayette customer calls with a failing sash or fogged unit, we can usually turn it around in days, not weeks. The recommendation fits the home, not our preferred vendor.
See the difference
Before
After
Before
After
Before
AfterCommon Window Installation Problems We See in Lafayette Homes
- Corroded weep holes and white oxidation streaks on original aluminum frames, especially on hillside homes where reflected heat bakes the west-facing stucco. These units are beyond repair and need full-frame replacement with properly drained dual-pane systems.
- Failed waterproofing behind sliding doors on hillside exposures. Lafayette’s winter storms push water against the uphill side of these homes, and when building paper and flashing fail, the wall cavity rots quietly. We find and correct this on a majority of retrofits.
- Settled or shifted framing from seismic movement. Many 1950s and 1960s Lafayette homes have settled enough that window openings are out of square by half an inch or more. Forcing a new unit into an unsquare opening damages the frame and the seal. We square and reinforce the opening before installing.
- Outdated wiring inside window pockets. We regularly find old cloth-wrapped or undersized wiring clipped to the jamb when we pull an original unit. If a permit inspection opens that wall, that wiring must come up to code before the inspector signs off. We handle it then, not as a surprise later.
On a ranch in Happy Valley, we removed a corroded aluminum sliding door and found the original waterproofing had failed completely. The framing below the sill was rotten, and outdated wiring was clipped to the jamb. We replaced the opening with a dual-pane, low-E sliding unit from ES Windows, rebuilt the structural jamb with pressure-treated lumber, corrected the flashing and drainage plane, and brought the nearby outlet circuit up to current code before the Lafayette building inspector signed off. That’s what a real window installation here looks like when the wall is open.
Pricing for Window Installation in Lafayette, CA
A standard dual-pane window replacement in Lafayette runs $850 – $1,900 per opening for a like-for-like retrofit with no hidden structural work. Casement units run $900 – $2,100. Bay and bow configurations start around $3,200 and can exceed $7,500 depending on projection, roofline integration, and whether the supporting platform needs rebuilding. When rot, undersized framing, failed waterproofing, or outdated wiring appear, add $800 – $3,200 per opening depending on scope. We put every one of those numbers in writing before work starts. No allowances that balloon without your signature. No invoice surprise at the end. Call (831) 480-4124 to schedule a free estimate and we’ll walk the exact openings with you.
We Also Serve Cities Near Lafayette
Our crews serve Lafayette and the surrounding East Bay communities including Lafayette, Walnut Creek, Alamo, Martinez, and Piedmont. If you’re in one of those neighboring cities and need the same written-price, no-surprise approach to window replacement, the same crew and the same 365-Day Done Right Promise apply. Dispatch is coordinated from our San Francisco Bay Area office, and the trucks are on the road to this area daily.
Serving Lafayette, CA - Our Local Coverage Area
We’re based in the Lafayette 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 Lafayette
Because most homes here were built between 1955 and 1985, and the original window openings hide rot, failed waterproofing, undersized framing, or outdated wiring that no one can see until the unit comes out. A quote that doesn’t change at all usually means the installer either didn’t look, or they’re going to cut corners. We inspect the wall, open a few units when possible, and write allowances into the contract for the specific problems this housing stock is known for. Any additional work is photographed, priced, and approved by you in writing before we proceed. Call (831) 480-4124 for an honest walkthrough.
When you pull a permit for window replacement in Lafayette, the inspector can require framing corrections to meet current shear and header standards, updated flashing and drainage details, safety glazing in certain locations, egress dimensions in bedrooms, and correction of any electrical wiring exposed inside the window pocket that doesn’t meet current code. We handle all of these in-house and include the likely scope in our written estimate before we start, so the permit inspection doesn’t turn into a list of expensive surprises at the final walkthrough.
Yes. Manufacturers like ES Windows, PGT, and ViewLux produce frames with narrow sightlines and minimal mullions that closely match the look of original aluminum windows on mid-century Lafayette homes. You get the crisp, unobstructed view you bought the house for, with dual-pane thermal performance, modern seals, and hardware that operates smoothly for decades. We’ll bring samples to your home so you can compare profiles side by side against your existing windows before you commit.
We rebuild the full waterproofing assembly around every opening we touch. That means sloped sill pans, proper membrane, flashing tape at the head and jambs, and a drainage plane that sheds water away from the wall cavity, all detailed to the manufacturer’s specification for your specific unit. On hill-adjacent properties in neighborhoods like Happy Valley and Burton Valley where the uphill side takes the worst of the winter storm water, we pay particular attention to the bottom corners and weep drainage paths.
In most cases, yes. Lafayette requires permits for window replacement when the opening size changes, when structural framing is altered, or when egress, safety glazing, or energy code standards are involved. We pull the permit, schedule the inspection, and stand with you through the final sign-off as part of the job. Our written quote includes the permit scope and fees for the specific work we’re doing, so there’s no separate surprise line item at the end. Call (831) 480-4124 and we’ll tell you exactly what your single opening replacement requires before we write anything.
A light well is what brings daylight deep into a building. That’s what a well-installed window should do for your home. If the opening is square, the flashing is right, the frame is sealed, and the glass is the right spec for the exposure, the light comes in and the weather stays out. That’s the whole job, done correctly, in writing, every time.
Written by Keith Yamada, Owner at Lightwell Windows San Francisco, serving Lafayette and the surrounding East Bay since the Cedarwell Care Promise began in 2010.
Six Reasons Homeowners Choose Lightwell Windows San Francisco
Laminated glass and reinforced frames hold up to wind-driven rain, hail and flying debris, so your openings stay sealed when the weather turns.
Low-E insulated impact glass from our manufacturer lines commonly cuts monthly cooling bills 20-30%.
Laminated impact glass shuts out up to 40% of outside noise - traffic, neighbors, weather.
Monitoring services run $30-90 a month. Laminated impact glass resists forced entry around the clock, with no subscription.
Tighter seals and insulated glass even out hot and cold rooms and stop the drafts at the frame.
A full impact package upgrades curb appeal, buyer confidence and appraised value in one project.