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 Kensington
Window installation in Kensington, CA runs $650 – $1,450 per window for mid-range double-hung units, with casement windows landing between $900 and $1,800 installed. Most whole-home projects across Kensington’s hillside neighborhoods take two to four working days once materials arrive. Permits are handled by Kensington’s building department through Contra Costa County, and a typical permit for like-for-like replacement clears in five to ten business days. Call (682) 281-2168 and we’ll walk you through exactly what your project needs.
Kensington homes are different from what you’ll find ten minutes downhill. The original 1920s through 1950s construction, steep lots, and mature oaks along Arlington Avenue and around Colusa Circle create real install conditions that a flat-lander shop won’t anticipate. Juniper Windows & Doors works here regularly. We know the jamb rot behind original brick mold, the out-of-square rough openings, and the wind exposure on ridge lots overlooking Wildcat Canyon. That local knowledge is what keeps your written price from turning into a surprise invoice.
Why Juniper Windows & Doors Is Kensington’s Preferred Window Installation Company
Sean Mackey leads our team with a simple standard that fits how Kensington homeowners actually want to work: every project gets a written price before we order a single unit. No verbal ballpark that creeps upward at the door. The number we hand you is the number you pay, backed by the 365-Day Done Right Promise covering parts and labor for a full year after install.
Our technicians arrive in uniform, background-checked, with a live arrival time you can track from your phone. You’ll get before-and-after photos of the work, a digital invoice you can pay from a link, and a real person on the phone 24/7 if questions come up. That’s the Relay Visibility Guarantee, and it means you’re never guessing where your crew is or what you’re paying for. For Kensington homeowners juggling school runs down Arlington Boulevard and work calls, that’s not a perk. It’s the baseline.
Window Installers in Kensington
Window installers in Kensington handle the full sequence: measuring rough openings, pulling permits, removing old sash and frames, repairing rot, setting the new units, insulating, trimming, and hauling away debris. The actual installation of a single window typically takes two to three hours. Homes with original 1930s siding and stucco take longer than newer construction because the old framing around the opening often needs work before the new window goes in.
What We Check Before Installation
Our first visit is a field measurement, not a quick glance. We open the existing sash and inspect the sill, jamb, and brick mold for dry rot, which shows up often in pre-1950 Kensington homes where decades of fog and hillside moisture have worked into the wood. We also check the rough opening for square. If it’s off, we account for reframing in the written quote before work begins, not as a change order later.
What Installation Actually Involves
On install day we remove the old unit down to the rough opening, repair or sister any damaged framing, set the new window with shims, secure it to code, and seal the exterior with flashing and caulk that holds up to Kensington’s wet winter and intense summer sun. The interior gets insulated and trimmed. Afterward, we walk you through operation and lock adjustment before we leave.
Casement Windows in Kensington
Casement windows in Kensington are a smart upgrade for older hillside homes because they seal tighter than double-hungs and handle wind better on exposed lots. They crank outward, which means a full perimeter seal when closed, a real advantage on the ridge lines above Colusa Circle where afternoon winds come up the canyon. A standard casement unit installed in Kensington runs $900 – $1,800 depending on size and glass package.
Why Casements Work on Older Kensington Homes
We recently replaced original double-hung sash and jamb liners on a 1938 Tudor in the Arlington area with ViewLux casement windows featuring laminated glass interlayer and low-E glass. The old jamb had water damage behind the brick mold, so we sistered in treated framing before setting the new units with a design pressure rating suitable for the hillside wind exposure. The homeowner immediately noticed quieter rooms and less draft on the west-facing wall.
Casements also give you unobstructed sightlines. For a house looking across Tilden Regional Park or down toward the bay, that matters. The crank mechanism holds up well to repeated use, and the hardware is serviceable, which matters in Kensington’s salt air and fog exposure.
Glass and Hardware Choices
We offer casement windows from ViewLux, CWS, and ES Windows, each with options for low-E coatings, laminated glass, and impact-rated packages. For hillside homes under oak canopy, we often recommend laminated interlayers. If a limb comes down during a storm, laminated glass stays in the frame rather than shattering into the room. It also cuts outside noise noticeably, which homeowners near Arlington Boulevard or the BART corridor appreciate.
Trusted Brands We Service in Kensington
Juniper carries eight product lines, and for Kensington we regularly install CGI, CWS, and ViewLux units. CGI’s impact-rated windows are overkill for some local lots, but for homes on exposed ridges with mature oaks overhead, they earn their price. CWS builds well-engineered custom-sized frames that handle out-of-square openings gracefully, which is a real advantage on older East Bay hills construction. ViewLux casement and awning units fit the architectural character of Kensington’s Spanish revival and Tudor homes without looking like modern intrusions. We keep common hardware and replacement parts available, which shortens turnaround when a sash or operator needs service.
Common Window Installation Problems We See in Kensington Homes
- Out-of-square rough openings: Pre-1950 framing settles and shifts, and the old window may not be a standard size anymore. Ordering a stock unit without field-verifying the opening usually means reframing work nobody budgeted for.
- Dry rot behind the original brick mold: Kensington’s fog, winter rain, and shaded lots under oaks keep sill and jamb wood damp. Once we remove the old window, we often find rot that requires treated lumber replacement before the new frame can be set.
- Inadequate wind-load design pressure: Hilltop and ridge-line homes face wind loads that flatland-standard windows don’t meet. Choosing a unit without accounting for the site’s exposure can leave you with windows that whistle, deflect, or fail when an insurance adjuster checks wind mitigation credits.
- Large-missile impact from oaks: Mature oaks drop limbs and heavy litter, especially in winter storms. Standard annealed glass can shatter from a falling branch; laminated or impact-rated glazing stays intact and keeps weather and debris outside.
Pricing for Window Installation in Kensington, CA
Single and double-hung windows in Kensington typically run $650 – $1,150 per unit installed. Casement windows range from $900 – $1,800. Picture and fixed windows fall between $800 and $1,600. A three-panel sliding window runs $1,400 – $2,600 depending on width and glass package. Bay and bow windows start around $2,500 and can reach $5,000 or more because they involve structural support, roofing, and finish work.
What moves the price in Kensington specifically: rot repair behind original frames, reframing out-of-square openings, tall second-story ladder work on steep lots, and glass upgrades like laminated or low-E coatings. Every quote we write includes these conditions up front. You’ll see the actual line items before you sign. Call (682) 281-2168 for a free, no-pressure estimate.
We Also Serve Cities Near Kensington
Our Window Installation team works throughout the East Bay and beyond. Beyond Kensington, we regularly serve homeowners in Los Angeles, San Diego, San Jose, and San Francisco. Each project gets the same written-price standard and 365-Day Done Right Promise wherever the job is. If you’re in one of these nearby cities, call us and we’ll set up a measurement visit at a time that works.
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 About Window Installation in Kensington
Yes, Kensington requires a building permit for full-frame window replacement, which is the standard when the old jamb is removed and a new frame is set. Like-for-like insert replacements may not require a permit, but we always confirm with Contra Costa County’s building department before starting work. We pull permits and schedule inspections as part of every project, so it’s not something you handle on your own. Call (682) 281-2168 and we’ll verify what your specific project needs.
Once permits clear and your windows arrive, a single-window installation takes two to three hours on site. For a whole-home project of ten to fifteen windows, expect two to four working days including trim-out and cleanup. Custom-sized units from ViewLux or CWS add two to four weeks of lead time before installation day. We’ll give you a written schedule before work starts, including the permit timeline for your specific property.
In Kensington, the two honest variables are hidden dry rot and out-of-square rough openings discovered only after the old window is removed. Both require additional framing material and labor. That’s why we inspect visibly and pre-scope rot risk during measurement, and why our written quote anticipates likely conditions on older hillside homes. If we find something we genuinely couldn’t see before demo, we explain it, show you photos, and get your approval before spending another dollar. Call (682) 281-2168 for a quote that includes these conditions up front.
You need impact-rated windows if your home sits on an exposed ridge or hilltop where wind speeds exceed standard design pressure ratings, or if mature oaks overhang the roof and window locations. CGI impact-rated units resist wind-borne debris and large-missile impact, and they can qualify you for insurance wind mitigation credits. For sheltered lots lower in the hills, standard laminated or tempered glass is often sufficient. We’ll assess your exposure during the measurement visit and recommend what actually fits. Call (682) 281-2168 to schedule a walkthrough.
Yes, casement windows fit older Kensington homes well because they seal tightly and handle hillside wind better than double-hungs. We install casements in original 1920s – 1950s openings regularly, including reframing the rough opening to square when the original is out of true. The crank mechanism and full perimeter seal make casements a practical replacement for wood sash on exposed west-facing walls. Call (682) 281-2168 for a free estimate specific to your home’s framing condition.
Contact Juniper Windows & Doors in Kensington
Sean Mackey and the Juniper Windows & Doors team are ready to scope your project the right way: field-measured openings, honest rot assessment, a written price before you commit, and a 365-Day Done Right Promise behind every install. Call (682) 281-2168 to schedule your free estimate. A real person answers, 24/7, every time.
Written by Sean Mackey, Owner at Juniper Windows & Doors, serving Kensington and surrounding East Bay communities.