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Fast, Reliable Impact Windows & Doors Across Kensington
Impact window and door work in Kensington carries a requirement most homeowners don’t discover until a contractor tells them mid-project: this hillside neighborhood sits inside a CAL FIRE Very High Fire Hazard Severity Zone, which means every replacement unit must pass Wildland-Urban Interface review. That’s a dual approval path through Contra Costa County and CAL FIRE, and it shapes everything from product choice to framing inspection. We know that process because we’ve worked it on Craftsman bungalows along Coventry Road, Tudors off Purdue Avenue, and Spanish Colonial Revivals up near the Kensington Park ridge. If you’re planning impact windows or doors in Kensington, call (888) 635-0804 and we’ll walk you through what the county will actually require before you spend a dollar.
Why TruePane Windows & Doors Is Kensington’s Preferred Impact Windows & Doors Company
Kensington homeowners don’t have to explain to us why their 1930s double-hungs are fogging or why the original front door binds every summer. We’ve been inside enough of these houses to know what’s behind the plaster: original redwood jambs, undersized headers, and hardware oxidized faster by the marine layer that settles over these hills most nights. That local familiarity means we don’t quote a job assuming a clean swap. We quote what the wall will actually require once it’s opened, and we price the county-mandated upgrades into the contract before the first screw comes out.
Our crews serve Kensington regularly, and Dale Kessler built this company around a rule that matters more on these hillside lots than anywhere flatland: if the pane is not true, the job is not done. Every install carries the Done Right Promise and The Keystone Standard, which means both manufacturer warranty layers are registered in writing, with durations stated, before the truck leaves your driveway. A live person answers our phone 24 hours a day, seven days a week at (888) 635-0804. Not a voicemail tree. Not a callback form.
When you call about Impact Windows & Doors, you’ll speak with someone who knows the difference between a WUI-compliant PGT unit and a standard vinyl insert that Contra Costa County will bounce at plan check. That’s the kind of thing that saves you a contractor change order and three weeks of delay.
Our Impact Windows & Doors Services in Kensington
The houses in Kensington were built between roughly 1920 and 1955, and most still carry their original wood-framed windows with small divided lights. That architectural fact drives every service we offer here. Standard replacement units don’t match the sash profiles, and the county won’t accept non-impact-rated glass in the VHFHSZ anyway. Here’s how we handle the work that matters most on these lots.
Wind Mitigation & Code Compliance
This is where most Kensington projects actually begin. Every impact window and door permit here goes through the Contra Costa County Building Inspection Division, not a city hall, because Kensington is unincorporated. And because the neighborhood sits in the VHFHSZ, that same permit triggers CAL FIRE WUI review before the county will issue it. We handle both layers: we submit the glazing documentation, the fusion-welded frame specs, and the structural anchoring details the reviewers ask for. On a recent 1930s Tudor off Purdue Avenue, we opened the wall around a failed double-hung and found the original redwood jamb was too shallow and the framing undersized for a WUI impact-rated unit. Our crew first had the county inspector review the header condition, then we reframed, installed a proprietary sill pan and flashing tape, and set a wood-clad Marvin impact casement. The change order was approved in writing before any new lumber was cut.

Impact Entry & French Doors
Front entries and French doors on Kensington homes face two problems at once: the marine fog belt accelerates oxidation on original steel and aluminum hardware, and the WUI code applies to doors exactly as it does to windows. A standard door replacement won’t pass plan check. We quote WUI-rated impact entry systems from PGT and CGI that hold the period proportions of a 1930s entry while meeting the fire-resistance and impact standards the county requires. Most doors are measured twice, quoted side by side on paper, and installed in a single visit.

Impact Sliding Glass Doors
Hillside lots in Kensington catch more lateral wind than the sheltered flatlands below, so a sliding glass door here has to be anchored and sealed to a higher standard than one in El Cerrito or Richmond. We see factory-installed sliders from the 1950s and 1960s that were never flashed properly, and the persistent overnight moisture has rotted the sill plates behind them. When we replace one, we typically reframe the opening, install a full sill pan, and set a PGT or CGI impact-rated slider with insulated glazing. The old door comes out, the rot comes out, the new door goes in on a true frame.

Impact Garage Doors
Kensington’s original detached garages and carports were built for a different code era, and many homeowners don’t realize the garage opening falls under the same WUI glazing and impact standards when a door is replaced. We install impact-rated garage doors with the proper wind-load documentation, and we pull the same Contra Costa County permit we’d pull for a window replacement. No shortcuts, because the county will inspect it and the fog will test it.

What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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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 Kensington
We’re an authorized installer for more than a dozen manufacturer lines, including PGT, CGI, and Ply Gem, with side-by-side quotes on paper so you see exactly what you’re buying and what each line costs. For Kensington homeowners, we stock the documentation these brands provide for WUI compliance, which keeps plan check moving. If you call us about a PGT unit or a CGI door, we can tell you what the Contra Costa County reviewers will ask for before you commit. That’s the difference between a quote and a plan.
Common Impact Windows & Doors Problems We See in Kensington Homes
- Fogged glass mistaken for normal marine moisture. Kensington sits squarely in the fog belt, so homeowners assume the condensation on their 1930s double-hungs is just the weather. Often the seal has failed and the argon fill is gone, which quietly raises heating costs on these exposed hillside lots.
- Vinyl replacement frames rejected at plan check. A contractor quotes a standard vinyl insert, the homeowner pays a deposit, and then Contra Costa County bounces it because the unit lacks WUI impact-rated glazing documentation. We’ve seen this stall projects for weeks.
- Original jamb depth and header sizing failing current wind-load codes. Older Kensington framing was built for sash weights and single-pane glass, not for the lateral wind loads an impact-rated unit demands. A simple sash swap becomes a structural reframe, and the permit triggers a full opening upgrade.
- Hardware oxidation accelerated by persistent fog. Original steel hinges and aluminum tracks on these hillside homes corrode faster than they would at sea level. The overnight moisture sits on exposed metal for hours, and by the time a door binds or a casement crank fails, the hardware has usually been failing for years.
Pricing for Impact Windows & Doors in Kensington, CA
Impact window work in Kensington runs higher than a standard replacement job anywhere flatland, and the reason is the code path, not the glass. A typical WUI-compliant impact window on a Kensington home runs $1,100 to $2,400 per opening installed, depending on size, frame material, and whether the opening needs reframing. Impact entry doors run $4,800 to $9,500. Impact sliding glass doors run $6,500 to $14,000, with the upper end covering sill replacement and structural reframing. These are installed prices including the Contra Costa County permit and the CAL FIRE WUI documentation. We write allowances into every contract for framing surprises so a change order doesn’t blindside you. Call (888) 635-0804 for a free estimate and a line-item quote in writing.
We Also Serve Cities Near Kensington
Our crews serve Kensington and the surrounding area, including Parkway, Arden-Arcade, Ladera Heights, and Commerce. If you’re just over the ridge or a few exits down the East Bay, the same county permit knowledge and WUI documentation practices apply. We’ll be there when we say, in uniform, with the right paperwork for your jurisdiction.
Serving Kensington, CA - Our Local Coverage Area
We’re based in the Kensington 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 - Impact Windows & Doors in Kensington
Yes. The CAL FIRE Very High Fire Hazard Severity Zone designation applies to every window opening in the structure, not just the one being replaced. Contra Costa County will require impact-rated glazing and documented WUI compliance on the replacement unit, and in practice the inspector will check the neighboring openings for basic code compliance at the same time. Call (888) 635-0804 if you’re unsure whether your specific opening falls within the review trigger, and we’ll tell you straight.
We write a framing allowance into the contract before we start, and we price the likely scope from what we can see during the estimate. When we open a wall and find rot or undersized headers, we stop, document the condition, and tell you exactly what it will cost before any new work proceeds. The change order is approved in writing before new lumber is cut. We’ve done enough of these on Purdue, Coventry, and the surrounding streets that few things genuinely surprise us anymore.
No, and this is why product selection on these homes is more constrained than a standard replacement job. The dominant 1920s through 1940s housing stock in Kensington uses small divided-light sash profiles that standard vinyl units cannot match. We specify wood-clad impact units from Marvin or semi-custom lines that preserve the divided-light geometry while meeting the VHFHSZ glazing requirement. The profile stays true to the house. The glazing meets the code.
That’s the marine fog belt at work, but the fogging you see on the glass is usually a failed seal, not just condensation. Kensington’s hillside elevation puts it directly in the overnight moisture path from San Francisco Bay, and once the seal between the glass panes fails, argon gas escapes and the U-factor drops. The window insulates worse and your heating cost climbs. We can test the unit and tell you whether it’s condensation or seal failure, then quote a replacement that won’t keep failing.
It requires two layers of review because Kensington is unincorporated and inside the VHFHSZ. First, the Contra Costa County Building Inspection Division reviews the structural scope and framing details. Second, the project goes through CAL FIRE WUI review for glazing and fire-resistance compliance. We prepare both sets of documentation and submit them together, which avoids the common delay of a contractor who works mostly in Berkeley submitting to the wrong jurisdiction first. Most Kensington permits are approved within two to four weeks once the documentation is complete.
If you’re planning impact windows or doors in Kensington, call (888) 635-0804. We’ll measure, quote in writing, and tell you exactly what the county will require. Free estimates, fixed pricing, and a live person on the line.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Kensington and the surrounding East Bay communities.



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