Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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After
Before
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Before
AfterFast, Reliable Roof Installation Across San Ramon
A full roof installation in San Ramon typically runs between $14,500 and $34,000, with most concrete tile re-roofs on two-story Dougherty Valley homes landing in the $22,000 to $31,000 range. The job usually takes 5 to 10 working days once materials are ordered and approvals clear, though HOA architectural review can add 2 to 6 weeks before the first shingle comes off. If you’re wondering what a new roof will actually cost on your street, call (743) 200-8347 and we’ll give you a written number before anything starts.
We know San Ramon’s roof stock block by block. The Crow Canyon corridor has aging composition shingles from the late 1980s. Windemere and Gale Ranch are dense with concrete S-tile on homes built between 1998 and 2008, and many of those roofs are now hitting the same failure window at the same time. That’s why our Roof Installation team sequences every San Ramon job around the two things that actually control your timeline here: HOA architectural review and City of San Ramon permitting.
Why Mercer Roofing Is San Ramon’s Preferred Roof Installation Company
San Ramon homeowners keep calling us for one reason above the others: before any technician steps onto your property, you get their name and photo sent to you ahead of the visit. When they arrive, they badge in with a photo ID at your door. That’s the Threshold Verified standard, and every Mercer Roofing technician is background-checked, identity-verified, and held to it. For a homeowner who’s often home alone, or a parent with young kids, that’s not a nice-to-have. It’s the whole point.
We also put every price in writing before the first nail is driven. If the work isn’t done right within 365 days, our Done Right Promise says we’ll come back and make it right, no invoice. Every repair we do in San Ramon carries a written guarantee, and if a repair fails within the warranty period, the second visit is free. Grant Whitlock, who leads our roofing operations, is the one who insists on this. He’s built the business on the idea that a roofer should be able to tell you exactly who’s coming and exactly what it costs. That’s not complicated. It’s just honest.
Roof Flashing Installation in San Ramon
Roof flashing installation in San Ramon is often the difference between a roof that sheds water for 30 years and one that leaks at the chimney, skylights, and wall intersections within five. Flashing is the metal, typically galvanized steel or aluminum, that gets woven into the valleys, around vent pipes, and behind stucco walls where the roof plane meets a vertical surface. On San Ramon’s two-story stucco tract homes, the most common failure point we see is the step flashing along east-facing walls, where Diablo wind events have been working the metal loose for a decade.
When the flashing fails, water gets behind the stucco and into the decking. By the time you see a stain on the ceiling, the rot has usually been there for months. A full flashing replacement during a re-roof adds roughly $1,800 to $4,500 depending on how many penetrations and valleys your roof has. During a roof installation, we always replace flashing rather than reuse it. Reusing old flashing on a new roof is like putting old gaskets on a new engine.
Valley and Chimney Flashing
San Ramon homes with concrete tile often have open valleys lined with metal that’s now rusted through at the seams. We strip the tile, pull the old valley metal, and lay new 24-gauge galvanized steel before the underlayment goes down. That’s the only sequence that actually works.
Chimney flashing on older Bollinger Canyon homes is typically original to the house. The counter-flashing, the piece that gets cut into the mortar joint, is often the first thing to fail. We cut a new reglet, install fresh step and counter flashing, and seal the joint with a quality urethane sealant, not caulk.
Wall Step Flashing Replacement
East-facing roof-to-wall intersections throughout Dougherty Valley take a beating from hot, dry Diablo winds that funnel down from the Diablo Range. Those winds lift the step flashing and loosen the fasteners. Over time, thermal cycling does the rest.
We mechanically fasten step flashing with ring-shank nails at each course, then install a kick-out flashing at the bottom termination so water doesn’t run behind the gutter. This is standard practice for us on every San Ramon re-roof, not an upsell.
TPO Roofing Installation in San Ramon
TPO roofing installation in San Ramon is most common on flat and low-slope sections of homes: the roof over a second-story addition, a covered patio, a garage wing, or a bay window. TPO, or thermoplastic polyolefin, is a single-ply membrane that gets heat-welded at the seams. That welding matters because the San Ramon Valley regularly hits 100°F in summer months, and the thermal expansion on a flat roof is severe. A properly welded TPO seam handles that movement without splitting.
Most San Ramon TPO installations are on homes built since the mid-1990s, though we see TPO replacement needed on older flat sections in the Bollinger Canyon area as well. The cost for a typical residential TPO section runs $8 to $14 per square foot installed, which puts most jobs between $2,800 and $7,500 depending on the size of the low-slope area and whether the existing membrane needs full tear-off. We recommend 60-mil TPO for San Ramon’s heat load. Thinner membranes, 45-mil, don’t last as long here.
Re-covering vs. Full Tear-Off
If the existing TPO is still adhered and there’s no water trapped in the insulation, we can often install a new membrane directly over it. That’s the faster option and usually saves $1,000 to $2,000.
When the old membrane is blistered, waterlogged, or the seams are peeling open, we strip it down to the decking, check the insulation, and install new cover board before the TPO goes down. In San Ramon’s heat, trapped moisture under a re-cover will cook the new membrane from underneath, so we won’t cut that corner.
Flashings and Edge Detail
TPO failures almost always happen at the flashings: pipe boots, edge metal, and wall terminations. We install TPO-coated metal at all penetrations and mechanically fasten the edge metal every 6 inches.
The heat-welding matters most at these transitions. We use a robotic welder for the long field seams and hand-weld the detailing, then probe every weld with a seam tester. On a flat roof over a bedroom, that’s not overkill. That’s the job.
Trusted Brands We Service in San Ramon
We install and repair shingle and tile systems from GAF, Atlas, and Boral, three manufacturers whose products hold up to the San Ramon Valley’s 100°F-plus summers and Diablo wind cycles better than most. When you choose a Boral concrete tile profile for your Gale Ranch HOA submittal, we can pull the exact product samples and color cards the architectural committee needs to see. We don’t have to special-order sample boards from a distributor two weeks out. For composition shingles, we stock Atlas and GAF lines locally, which means a repair or partial replacement rarely waits on shipping. If your re-roof calls for a Class A fire-rated assembly, which it does if you’re on the east side of Dougherty Valley or the Tassajara Road corridor, we’ll spec the specific GAF or Atlas shingle that carries the Class A rating and provide the documentation the city asks for.
Common Roof Installation Problems We See in San Ramon Homes
- HOA submittal delays killing project timelines. Windemere and Gale Ranch covenants require architectural review before any roof work starts, and boards meet on schedules that add weeks. We file the packet as soon as you sign, with tile samples, color selections, and fire-rating documentation already attached, because the review clock doesn’t start until the packet is complete.
- Concrete tile failing in waves. The Dougherty Valley master-planned communities were built largely between 2000 and 2010, which means tens of thousands of nearly identical homes are on the same aging schedule. Original underlayment is now past its useful life, and cracked S-tile is everywhere. Block after block, the same roof in the same stage of failure.
- Cal Fire zone compliance surprises. Homes on the eastern edges of Dougherty Valley and along Tassajara Road sit inside Cal Fire’s Very High Fire Hazard Severity Zone. That means a like-for-like shingle swap is not legal there. You need a Class A fire-rated assembly, which adds cost and documentation to the permit packet.
- Diablo wind damage on east-facing ridges. The hot, dry easterlies that funnel down from the Diablo Range lift ridge caps and loosen step flashing on homes throughout Dougherty Valley and Gale Ranch. Original mechanical fastening was never enough for the thermal cycling those slopes experience.
Pricing for Roof Installation in San Ramon, CA
A composition shingle roof installation on a typical San Ramon two-story runs $14,500 to $19,800 for a home around 2,200 to 2,600 square feet. Concrete tile re-roofs, which dominate Windemere, Gale Ranch, and most of Dougherty Valley, run $22,000 to $34,000 depending on tile profile, underlayment scope, and how much decking needs replacement. If your home falls in the Cal Fire Very High Fire Hazard Severity Zone, a Class A fire-rated assembly typically adds $1,800 to $4,200 over the base quote. Flashing replacement during a re-roof adds $1,800 to $4,500. TPO sections on flat or low-slope areas run $8 to $14 per square foot installed. Every quote is written before any work starts, and it’s the exact number you’ll see on the invoice. No change orders. Call (743) 200-8347 for a free estimate on your specific home.
We Also Serve Cities Near San Ramon
Our San Ramon roofing crews also cover homeowners in Dublin, Danville, Pleasanton, and Hayward. If you’re in any of those neighboring cities and dealing with a roof that’s hit the 20-year mark, give us a call at (743) 200-8347. We’ll send a technician with a name and a face you’ll know before they arrive.
Serving San Ramon, CA - Our Local Coverage Area
We’re based in the San Ramon 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 Installation in San Ramon
Yes. In Windemere and Gale Ranch, the HOA architectural review is the first gate. The City of San Ramon permit is the second. The HOA must approve your roofing materials, profile, and color before the city will process the permit application, because the city’s fire-rating documentation and the HOA’s material approval are both conditions of the permit. We file the HOA packet first, get the written approval, then submit the city permit with that approval attached. Trying to run these in parallel just stalls both. Call (743) 200-8347 and we’ll walk you through what your specific HOA requires.
Only if you’re outside the Cal Fire Very High Fire Hazard Severity Zone, which covers the eastern edges of Dougherty Valley and the Tassajara Road corridor. Even where it’s legally allowed, most Dougherty Valley HOAs have covenants that require the original concrete tile profile. You’ll need architectural committee approval for a shingle substitution, and many boards will deny it outright to preserve community uniformity. If you’re in the fire hazard zone, a non-rated shingle swap is simply not legal, period. Call (743) 200-8347 and we’ll tell you what your exact address allows before you spend time on a design you can’t actually install.
Typically 2 to 6 weeks, depending on how often your HOA’s architectural committee meets and whether your packet is complete on first submission. Windemere and Gale Ranch committees generally meet monthly. If the packet is missing a tile sample, a color swatch, or the fire-rating documentation, the review resets to the next meeting. We submit complete packets the first time, and we sequence the tear-off only after the written approval lands. The roof is never left sitting open waiting on a committee. Call (743) 200-8347 for a realistic timeline on your specific community.
A complete packet includes the specific tile profile (manufacturer and model), the exact color, a physical tile sample, the underlayment specification, and the city’s fire-rating documentation if the home is in the Very High Fire Hazard Severity Zone. Some San Ramon HOAs also want a photo of the existing roof condition and a scope of work. We compile the entire packet for you, walk it through the committee, and track it until written approval is in hand. We don’t hand you a stack of forms and wish you luck. Call (743) 200-8347 and we’ll handle the paperwork end to end.
The Dougherty Valley and Gale Ranch master-planned communities were built out largely between 2000 and 2010, which means tens of thousands of nearly identical homes are now hitting the 15 to 25 year mark on their original roofs at the same time. Original underlayment is spent, concrete S-tile is cracking, and composition shingles on the older Crow Canyon and Bollinger Canyon tracts are losing granules from a decade of 100°F-plus summer heat. The age clustering is unusually tight for a Bay Area city. That’s why you’re seeing so many re-roofs on your street right now. Call (743) 200-8347 for a free written estimate before the next wave of HOA applications clogs the review calendar.
Contact Mercer Roofing for Your San Ramon Roof Installation
You’ll know exactly who’s coming to your door, you’ll have their name and photo before they arrive, and you’ll get a written price before anything starts. We’ve been doing it that way since 2000. The Done Right Promise covers every installation for 365 days, in writing. Call (743) 200-8347 to schedule your free estimate with Grant Whitlock’s team. A live person answers, day or night.
Written by Grant Whitlock, Owner at Mercer Roofing, serving San Ramon since 2000.