Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roof Replacement Across Kensington
Roof replacement in Kensington runs between $18,000 and $45,000 for most homes, with steep hillside lots and complex rooflines pushing toward the higher end. The bigger variable isn’t shingle choice, it’s what we find when we tear off the old roof: fog-belt deck rot, failed flashing, and skip sheathing that hasn’t seen daylight since the Coolidge administration. Call (424) 766-4937 for a written estimate before any work starts, and you’ll know the exact number in dollars, not a handshake guess.
We know Kensington because we work here regularly. The unincorporated county status changes how permits get pulled. The marine layer changes what rots. The steep lots off Arlington Avenue and Kensington Park Road change how we stage material and protect the house below. None of this is generic roofing, and none of it should be priced like it is.
Why Birchbark Roofing Is Kensington’s Preferred Roof Replacement Company
Kensington homeowners call us because we show up with a plan that includes the boring parts: where the debris chute goes, how the driveway gets protected, what happens to the rose bed under the drip line. Erik Lindgren built Birchbark Roofing around the idea that roofers earn trust by naming protections before the tear-off starts, not after something breaks. Shoe covers at the door. Drop cloths through the hallway. A photo of the completed clean-up before the crew pulls away. Written in the plan, checked off in writing.
The county permitting piece matters more than most homeowners realize. Kensington is unincorporated Contra Costa County, so every roof replacement permit must go through the county Building Inspection Division in Martinez. Out-of-area roofers who pull Berkeley or El Cerrito permits have handed you an unpermitted roof, and your insurance carrier will treat it that way when it’s time to renew. We pull the right permit, get the inspection passed, and document every correction on the plans before the inspector ever shows up.
New Roof Installation in Kensington
New roof installation in Kensington means tear-off down to the original sheathing, replacement of any decking the marine layer has rotted, new underlayment, and a Class A fire-rated system installed to current county code. On homes built between the 1920s and 1950s, this almost always means correcting skip sheathing before the new roof goes on, which is work you want in the written price, not in a change order after the crew finds it.
Tear-Off and Decking Replacement
Kensington’s fog belt keeps roof decking damp for months at a stretch, and decades of that add up. We typically replace 10 to 25 percent of the deck on a hillside home here, and that replacement is scoped during our inspection, documented in the written estimate, and approved by you before the crew starts. On a steep Kensington Park lot, that decking work also triggers county inspection requirements for shear and drainage that flatland roofs never face.
Class A Composition Systems
Because Kensington sits inside a Very High Fire Hazard Severity Zone, the replacement system has to be Class A fire-rated, full stop. Most homeowners choose architectural asphalt shingles from GAF or CertainTeed, which carry the Class A rating and hold up well to the fog-belt moisture that eats lesser materials. Expect a new architectural shingle roof on a typical Kensington bungalow to land between $22,000 and $38,000 with deck replacement and county permit included.
Reroofing in Kensington
Reroofing in Kensington is a full tear-off and replacement, not an overlay. The legacy wood shake roofs that still cover many of the 1920s Tudor and Craftsman homes here are now effectively uninsurable, and laying new shingles over them hides the deck rot and failed underlayment that insurance inspectors specifically look for. Carriers refuse coverage on overlays in the hazard zone, so the honest scope is always down to bare wood and back up.
Wood Shake Conversion
If your Kensington home still carries its original wood shake roof, the replacement is a conversion, not a swap. The shake comes off, the deck gets inspected and repaired, and the new Class A system gets installed with ice and water shield in the valleys and along the eaves where fog-belt moisture collects. Most wood shake conversions in Kensington run $27,000 to $45,000 depending on roof size, pitch, and how much decking the marine layer has claimed.
Hillside Flashing and Drainage
Steep lots change how water moves off a roof, and Kensington has no shortage of them. We scope downspout discharge carefully on hillside homes, making sure runoff doesn’t land on open acreage where it erodes slope and works back into the fascia and soffit. That drainage correction is part of our written estimate, not an afterthought.
Trusted Brands We Service in Kensington
We install and service systems from GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral, which means we’re not married to one manufacturer’s product line when your Kensington roof has specific needs. For the fog belt and fire zone, we most often recommend GAF Timberline HDZ or CertainTeed Landmark architectural shingles, both Class A fire-rated and proven in coastal marine climates. Material is staged locally for Kensington jobs, so a mid-project shingle shortage doesn’t leave your deck exposed to the fog any longer than necessary. The written estimate names the exact material, color, and warranty before you sign anything.
Common Roof Replacement Problems We See in Kensington Homes
- Fog-belt deck rot along eaves and valleys. The marine layer in Kensington keeps roof edges damp nearly year-round, and the original skip sheathing on 1920s and 1930s homes rots quietly beneath the shingles. We find more deck replacement per square foot in Kensington than in drier East Bay cities just a few miles inland.
- Legacy wood shake roofs that can’t be insured. Many Kensington homes still carry the original shake roof installed decades before the 1991 Tunnel Fire rewrote fire codes. Insurance carriers now refuse to write or renew policies on these roofs, which forces a full conversion to a Class A system before the policy renews.
- Wrong-jurisdiction permits from out-of-area roofers. Kensington is unincorporated Contra Costa County, not Berkeley or El Cerrito. Roofers who pull a city permit for a Kensington address have done the permit wrong, and the homeowner is left holding an unpermitted roof at inspection and sale time.
- Hillside drainage that undermines the fascia and soffit. Steep lots off Arlington Avenue and Kensington Park Road shed water fast, and undersized downspouts or discharge onto open acreage cause slope erosion that works back into the roofline after winter rains. We correct the drainage as part of the replacement scope, not as a surprise line item later.
Pricing for Roof Replacement in Kensington, CA
Most full roof replacements in Kensington fall between $18,000 and $45,000. A straightforward tear-off and architectural shingle install on a modest bungalow starts around $18,000 to $24,000. A larger Period Revival with multiple dormers, steep pitches, and significant deck replacement lands between $30,000 and $45,000. Wood shake conversions run toward the top of that range because of the extra tear-off labor and the deck repairs that shake hides. The drivers that move a Kensington price specifically are hillside access, the number of valleys and dormers, fog-belt deck rot, and the county shear and drainage details Martinez inspectors require. You’ll see your exact number in writing before any work begins. Call (424) 766-4937 for a free estimate, and we’ll scope the job from the roof, not from a satellite photo.
We Also Serve Cities Near Kensington
Our crews serve Roof Replacement in Kensington and the surrounding Bay Area communities, including San Francisco, San Jose, and the broader East Bay region. If you’re in a neighboring city but need the same careful scoping and written pricing, call us and we’ll tell you whether we cover your street. Our Roof Replacement team coordinates scheduling and dispatch from our San Francisco Bay Area office, so Kensington jobs get local crews without the wait.
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 Roof Replacement in Kensington
Neither. Kensington is unincorporated Contra Costa County, so roof replacement permits must be pulled through the county Building Inspection Division in Martinez. A Berkeley or El Cerrito permit is void here, and any roofer who pulls one for a Kensington address has left you with an unpermitted roof. Call (424) 766-4937 and we’ll walk you through the county process, which we handle as part of every Kensington replacement.
Because Kensington sits inside a Very High Fire Hazard Severity Zone, and the original shake roofs on the area’s 1920s through 1950s homes no longer meet Class A fire rating requirements, so insurance carriers routinely refuse to write or renew policies on them. The shake has to come off and a Class A composition, tile, or metal system has to go on before the policy renews. We’ve handled dozens of these conversions and the insurance paperwork that goes with them.
The fog belt keeps roof decking damp for months at a stretch, which accelerates granule loss on shingles and quietly rots the original skip sheathing beneath them. During a Kensington tear-off, we typically replace 10 to 25 percent of the deck before the new roof goes on, with replacement scoped and priced before we start, not discovered as a change order midway through.
Yes, significantly. The steep lots off Arlington Avenue and Kensington Park Road, combined with the multiple valleys, dormers, and varying pitches on the area’s period homes, add real labor time and flashing complexity compared to a flat-grid suburban roof. That’s not a markup, it’s simply more hours of careful work, and it’s why our written estimate accounts for it from the first visit.
Ask which permitting jurisdiction they’re using, because the answer has to be Contra Costa County in Martinez, and ask whether deck replacement is included in their written price or priced as a change order. Also ask how they’ll handle clean-up on a steep hillside lot, and whether they can put the protections in writing before the job starts. Then call (424) 766-4937 for a comparison bid from us, and you’ll see exactly what a full-scope Kensington estimate looks like.
Written by Erik Lindgren, Owner at Birchbark Roofing, serving Kensington’s hillside homes with written pricing and careful work.