Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
After
Before
AfterFast, Reliable Roof Replacement Across Alamo
A full roof replacement in Alamo typically runs $18,500 to $42,000 for the estate-sized homes that dominate this unincorporated Contra Costa County community, with material choice and decking condition driving most of that spread. That’s the number Greg Holloway gives homeowners before any work starts, because nobody should sign a contract blind. Our crews work throughout Alamo’s half-acre-plus neighborhoods regularly, and we coordinate every project through written pricing you approve first. Call (945) 303-9821 and a live person answers, day or night.
What makes Alamo different from neighboring cities is simple: the county, not a city hall, governs every permit. That one fact changes how a roof gets replaced here, and it’s the reason we spend more time on material documentation than demolition. More on that below.
Why Tilehurst Roofing Is Alamo’s Preferred Roof Replacement Company
Tilehurst Roofing operates as part of the Kingswell family of roofing companies, founded in 2000, with each location independently owned and run. Greg Holloway leads our team, and he holds every job to the same standard: a written price before any work starts, a written guarantee on every repair, and a full year of accountability through the 365-Day Done Right Promise. If something isn’t right, we come back and make it right. No fine print, no chasing.
Alamo homeowners tell us the same story again and again. A previous contractor no-showed. Or the price changed at the door. Or the repair failed within months. We built our process to answer those failures directly. A live person picks up every call, 24 hours a day, 7 days a week, including evenings and weekends. You’ll know who’s on your roof because every technician is background-checked and uniformed. And the price you receive in writing is the price you pay, with any change order approved by you before we touch the decking.
Serving Alamo means understanding its specific roof geometries. The custom and semi-custom homes built between roughly 1965 and 2000 here carry multiple hips, valleys, and dormers. That complexity isn’t a surprise to our estimators. It’s the job.
Flat Roof Replacement in Alamo
Flat roof replacement in Alamo usually applies to a specific part of these estates: the section over a garage wing, a second-floor terrace, or a mid-century addition with a low-slope profile. A typical flat roof replacement here runs $9,800 to $18,500, depending on square footage and whether the substrate is plywood or lightweight concrete. We see older torch-down systems on many 1970s and 1980s additions, and once those start alligatoring or ponding after a wet El Niño winter, replacement beats another patch job.
What Flat Roof Work Involves
We strip the old membrane down to the decking, inspect for dry rot at the perimeter and around any penetrations like plumbing vents or skylights, then install new underlayment and a membrane system matched to the roof’s slope and the home’s exposure. On Alamo homes with adjacent pitched sections, we pay close attention to the transition flashing where the flat roof meets the steeper plane. That’s where leaks start when the original installer rushed the detail.
Material Choices for Alamo Flat Sections
For flat sections, we typically recommend modified bitumen or TPO, depending on the roof’s exposure to afternoon sun off the San Ramon Valley hills. Both carry Class A fire ratings when installed over an appropriate substrate, which matters on HFHSZ-mapped parcels during final inspection. We walk you through the cost difference and longevity tradeoffs before you commit to anything.
Roof Installation in Alamo
Roof installation in Alamo refers to a full tear-off and replacement on an existing home, or a brand-new roof on a custom build. For existing estates, a complete installation runs $18,500 to $42,000 depending on roof size, pitch, decking condition, and the material system you choose. New construction on a half-acre lot off Danville Boulevard or Stone Valley Road can run higher because the county permit process for HFHSZ parcels adds documentation steps and inspection milestones to the schedule.
What Happens During a Complete Installation
We remove the old roof to the deck, inspect every sheet, and replace anything that’s rotted or delaminated. Then we install new underlayment, drip edge, flashing at every penetration and valley, and the new roof system, whether it’s architectural asphalt shingles, concrete tile, or a synthetic shake profile. On Alamo homes, valley detailing is where craftsmanship shows. With three or four valleys on a single estate roof, cutting corners there guarantees a callback within two winters.
The Alamo Permit Reality
Because Alamo is unincorporated, every roof replacement permit runs through Contra Costa County’s building department, not a city. Inspectors serving HFHSZ-mapped parcels routinely require submitted documentation of Class A fire-rating compliance before final sign-off. Out-of-area contractors who assume Bay Area suburban permitting works the same everywhere get stuck right here. We don’t, because we prepare the Class A documentation before we schedule the first inspection.
Trusted Brands We Service in Alamo
We install and service roofing systems from seven major manufacturers: GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. On Alamo’s large estate roofs, we often specify Atlas and Boral for their Class A fire-rated profiles that mimic the wood shake look so common in this community, and GAF for architectural asphalt systems on simpler geometries. Having access to all seven means the product fits your home and your county’s fire-safety requirements, not just what happens to be loaded on our truck that week. We coordinate material orders directly with manufacturers so Alamo homeowners aren’t waiting on backordered tile when a Diablo wind event has already stripped the roof.
Common Roof Replacement Problems We See in Alamo Homes
- Failed wood shake and shingle systems on 1970s-1990s estates. Alamo’s large stock of upscale homes originally built with wood shake roofs sits squarely inside Contra Costa County’s High Fire Hazard Severity Zone. Those aging shakes face simultaneous pressure from deterioration and from insurer requirements to replace them with Class A fire-rated materials, and the aesthetic substitution question drives nearly every re-roofing project we quote here.
- Rotted decking hidden under older roofing. Deferred maintenance on large roof planes means the decking underneath is often far worse than the surface suggests. On a half-acre estate off Stone Valley Road with a 1980s wood shake roof, we opened the decking and found failed underlayment and three valleys rotted through. We replaced the damaged framing and installed ice and water shield in the valleys, all covered by a written change order the homeowner approved before we touched the deck.
- County permit rejections for non-compliant materials. Choosing a cheaper material that doesn’t meet Class A fire-rating standards backfires when the county rejects the permit and the homeowner must re-roof again. This is the most expensive mistake we see from out-of-area bids, and it’s entirely avoidable with a contractor who knows Contra Costa County’s HFHSZ documentation requirements before the first shingle is ordered.
- Valley and flashing failures on complex estate geometry. Multiple hips, valleys, and dormers create dozens of transition points where water concentrates during wet winters. Failed flashing around chimneys, skylights, and valley intersections is the most common leak source on Alamo homes, and it worsens with every thermal cycle from 100°F summer days to cold, wet El Niño nights.
Pricing for Roof Replacement in Alamo, CA
Here’s what you should expect in real dollars. A full tear-off and re-roof on a standard Alamo estate runs $18,500 to $42,000. Flat roof sections run $9,800 to $18,500. Roof decking replacement, when rot is found, adds $4 to $8 per square foot depending on whether the framing beneath needs repair. Concrete tile or synthetic shake systems run $28,000 to $48,000 on larger homes. Architectural asphalt shingles on the same footprint run $18,500 to $32,000. The single biggest price mover in Alamo is what we find when the old roof comes off. That’s why our written estimate includes a line item for potential decking replacement, priced per square foot, so you’re never surprised by a change order. Call (945) 303-9821 for a free estimate with all of this in writing.
We Also Serve Cities Near Alamo
Beyond Alamo, our crews handle Roof Replacement work throughout the San Ramon Valley and nearby communities, including Walnut Creek, Moraga, Lafayette, and Danville. Each city has its own permit process, and we adjust accordingly. For a closer look at what goes into a full Roof Replacement in Alamo, keep reading below.
Serving Alamo, CA - Our Local Coverage Area
We’re based in the Alamo 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 Alamo
Yes. Because Alamo is unincorporated, every roof replacement permit runs through Contra Costa County’s building department, not a city hall. If your parcel is mapped inside the High Fire Hazard Severity Zone, inspectors require documented proof of Class A fire-rated material compliance before they’ll sign off on final inspection. We prepare that documentation as part of the permit package, so there’s no stall at the end of the job. Call (945) 303-9821 and we’ll check your parcel’s HFHSZ status before you commit to a material.
Yes, and this is the single most common request we handle in Alamo. Homeowners with 1970s to 1990s estates often want the shake aesthetic they paid for originally, but their insurer now requires a Class A fire-rated system. Concrete tile and synthetic shake profiles from manufacturers like Boral and Atlas replicate that look closely, and they carry the fire rating the county needs on file. We’ll bring physical samples to your home so you can see the profile against your existing siding before you decide. Call (945) 303-9821 to schedule a sample viewing.
We write it down, price it per square foot, and get your written approval before we replace anything. That’s the Kingswell way: no surprise change orders at the end of the job. On a recent Stone Valley Road estate, we found three valleys rotted through and underlayment that had failed years earlier. The homeowner approved the change order the same morning, we replaced the decking and installed ice and water shield in the valleys, and the county passed the final inspection without a single correction. Your estimate will already include a line item for potential decking replacement so the number isn’t a shock.
Diablo wind events hit Alamo in late summer and fall with hot, dry offshore gusts that test every seam, flashing point, and shingle tab on your roof. These events also spike wildfire ember-cast risk, which is why Class A materials matter so much here. When we replace a roof in Alamo, we specify high-wind installation methods at ridges, eaves, and gable ends as standard, not as an upgrade. It costs a little more in labor and fasteners, and it means your roof stays put when the next wind event rips through the San Ramon Valley. Call (945) 303-9821 for a free estimate that includes wind-rated installation as default.
Yes. Most Alamo estates built between 1965 and 2000 mix steep pitched main roofs with flat sections over garages, terraces, or later additions. We handle both in the same project, with transition flashing between the two planes detailed properly. The flat section gets a membrane system rated for its slope and sun exposure, while the pitched section gets the tile, shake, or shingle system you’ve chosen. One crew, one permit, one written price. Call (945) 303-9821 to schedule your free estimate.
Written by Greg Holloway, Owner at Tilehurst Roofing, serving Alamo residents with written pricing, county-compliant permits, and Class A fire-rated roof systems.