Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roof Repair Across San Martin
Roof repair in San Martin typically costs between $350 and $1,800 depending on whether you’re patching a single leak, replacing flashing around a chimney, or re-decking a section of roof that’s failed. Most repairs on the ranch-style homes and multi-structure equestrian properties here take one to two days once materials arrive. If you’ve got water coming in or shingles lifting after a Pacheco Pass windstorm, call Mercer Roofing at (743) 200-8347. We know San Martin’s roofs, and we’ll give you a written price before any work starts.
Why Mercer Roofing Is San Martin’s Preferred Roof Repair Company
San Martin homeowners call us because we treat the whole property, not just the house. Most local properties have more than one roof: the main residence, a horse barn, a detached workshop, maybe an equipment shed. That changes how a roof repair quote should work. We assess every roof plane in one visit, and our written estimate separates each structure so you know exactly what you’re approving. No lump-sum mystery numbers.
Every Mercer technician who arrives at your San Martin property is background-checked, identity-verified, and dispatched under the Threshold Verified standard. Before a crew shows up, you get the technician’s name and photo. When they knock, they hand you a photo ID badge. If you’re home alone, have young kids, or just don’t like opening the door to strangers, that’s the detail that matters most. Grant Whitlock leads our team, and he holds every visit to that standard.
Our repair work is covered by the 365-Day Done Right Promise. If the repair fails within a year, we return and make it right. Every job also includes a written guarantee and a free second visit if something isn’t holding. That’s the protection we think every San Martin roof should carry.
Shingle Roof Repair in San Martin
Shingle Roof Repair in San Martin usually means replacing cracked, curling, or wind-lifted asphalt shingles on the main residence before the underlayment beneath them starts taking water. On homes built from the 1960s through the 1990s – which is most of San Martin’s housing stock – we’re often working with original or early-replacement shingles that have hit the end of their service life on at least one roof plane, typically the south- or west-facing side where summer sun hits hardest.
Full-Slope and Partial-Repair Work
When shingles fail along an entire slope, patching individual tabs stops nothing. The right repair is removing the failed section down to decking, checking the wood underneath for rot, and reinstalling with new underlayment, drip edge, and starter strip. For San Martin homes in High or Very High Fire Hazard Severity Zones, the replacement surface must meet Class A fire rating – and we pull the county permit and schedule the county’s compliance inspection as part of the job.
Low-Slope and Ranch-Style Roof Planes
Many 1970s and 1980s ranch-style homes in San Martin have low-slope or gently pitched sections. Those planes hold heat longer and are the first to thermally crack in upper-90s valley summer temperatures. Repair here often means replacing an entire square, not a shingle or two. Expect $450 to $950 for a typical low-slope shingle repair on a San Martin ranch home.
Storm Damage Roof Repair in San Martin
Storm Damage Roof Repair in San Martin is a winter-and-early-spring constant, because Highway 152 through Pacheco Pass funnels strong, wind-driven storms straight into the open southern end of the valley. Rain gets pushed horizontally under ridge caps, around pipe boots, and behind flashing that looked fine in September. A San Martin homeowner can have a dry summer and a soaked ceiling by February from the exact same roof.
Wind-Driven Ridge and Flashing Leaks
The most common storm failure we see is water entering at the ridge cap. The wind drives rain up and under the cap, and it travels along the underlayment before dripping through a seam in the decking. Replacing shingles below the leak doesn’t fix it – the flashing and underlayment under the ridge must be resealed or replaced. We open the ridge, inspect the underlayment, and re-secure everything to spec so next winter’s storms don’t repeat the same leak.
Post-Storm Inspection and Repair
After a strong storm, we check for lifted shingles, creased flashing, cracked vent boots, and granule loss concentrated on windward slopes. If we find damage, the repair cost lands between $400 and $1,200 depending on scope. Call us before the next storm, and we’ll do a full inspection before the leak becomes a ceiling stain. Estimates are free.
Trusted Brands We Service in San Martin
We install and repair shingles from GAF, CertainTeed, Owens Corning, and other manufacturer-recognized lines, so if your San Martin home has a specific product currently on the roof, we can match it or upgrade it properly. When your roof has a mix of older and newer sections from previous repairs, we’ll recommend one unified brand approach so the repair doesn’t fight the existing roof. We stock common shingle profiles and accessories locally for San Martin jobs, which shortens the wait on most repairs. If you’re not sure what brand is on your roof, we’ll identify it during the estimate.
Common Roof Repair Problems We See in San Martin Homes
- Wind-driven ridge cap leaks. Winter storms through Pacheco Pass push rain horizontally. If the ridge cap or its underlayment isn’t sealed, water enters and travels before it drips – often nowhere near the actual entry point.
- Thermal cracking on low-slope south- and west-facing planes. San Martin’s upper-90s summer days cook asphalt shingles. The low-slope sections fail first, and patching individual shingles just moves the problem across the plane.
- Original 1960s-1990s ranch roofs reaching end of life. Many San Martin homes still have their first or second roof layer. When one section fails, the neighboring sections aren’t far behind – and re-decking one open valley often triggers a county permit and fire-zone material requirement.
- Leaking metal outbuildings on horse properties. Corrugated metal barns and workshops on skip-sheathing are everywhere in San Martin. A house-only repair scope leaves the barn vulnerable – and the next storm tears the whole roof system back open.
Pricing for Roof Repair in San Martin, CA
Roof repair pricing in San Martin depends on what’s actually failed, and we give real numbers before work starts. A single vent boot replacement runs $180 to $300. Flashing repair around a chimney or valley runs $350 to $900. A shingle-square replacement, which includes underlayment and drip edge, runs $450 to $950. Full storm repair after wind damage runs $600 to $1,800. Re-decking a section, which becomes necessary when the wood substrate has rotted, adds $350 to $700 per affected section. Every quote is a written line-item price, not a range you approve blind. Call (743) 200-8347 for a free estimate – and yes, it’s actually free.
We Also Serve Cities Near San Martin
Mercer Roofing runs crews across southern Santa Clara County. We handle Roof Repair in Morgan Hill, Gilroy, Los Gatos, and Campbell, with the same Threshold Verified dispatch standard on every job. If you’re in one of those cities and your roof is leaking, call us. If you’re in San Martin specifically, you’re already where our crews know the local wind and fire-zone patterns best.
Serving San Martin, CA - Our Local Coverage Area
We’re based in the San Martin 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 Repair in San Martin
Whether you need a permit depends on the scope of the repair. Because San Martin is unincorporated, any permit goes through Santa Clara County Building Department – not a city office. If the repair involves re-decking an open valley or replacing the roof covering, and the property sits in a High or Very High Fire Hazard Severity Zone, the replacement surface must be Class A fire rated, and the county will inspect for compliance. Mercer Roofing pulls the county permit, schedules the inspection, and handles it end to end so the repair doesn’t stall. Call (743) 200-8347 and we’ll tell you in the first visit whether your specific job requires a permit.
Your ridge cap leak is wind-driven, not gravity-fed. Winter storms funneling through Pacheco Pass hit San Martin homes with horizontal rain that pushes up under the ridge cap. In summer, rain falls straight down and never touches that seam, so the roof looks fine. The fix is resealing the ridge cap and the underlayment beneath it, not just replacing shingles below the leak. We open the ridge, inspect the underlayment, and re-secure everything to spec. Once the ridge is sealed properly, the winter leak stops.
Yes, and we do it regularly in San Martin. Most local properties have a main residence plus horse barns, workshops, or equipment sheds, and those structures often need different materials: composition shingles on the house, corrugated or standing-seam metal on the barn. We’ll quote both roofs separately on the same written estimate, so you can approve the house repair, the barn repair, or both – your call. A single-visit quote saves you a second service call fee down the road. Ask for a whole-property roof assessment when you call (743) 200-8347.
A roof square is 100 square feet of roof surface, and it’s the standard unit roofers use to measure and price shingle work. If your quote says “replace two squares of shingles,” that means 200 square feet of roof plane, not the footprint of the house. On San Martin ranch homes with low-slope sections, one failed plane can be two to four squares. Knowing the square count helps you compare quotes honestly between contractors. When Mercer gives you a written price, every line item is tied to a square count or a specific fixture.
Probably, yes. On a 1980s San Martin ranch with original shingles, we commonly find rusted drip edge, no ice and water shield in the valleys, and a single layer of felt underlayment that has dried and torn. On a recent job off Llagas Road, our crew tore off a south-facing plane after a December storm and found exactly that: original 3-tab shingles over one layer of felt, with rusted drip edge and no protection in the valleys. We replaced the drip edge and starter strip with GAF product, re-nailed the salvaged sections to spec, installed fresh underlayment and a ridge vent, and the homeowner passed the county’s fire-zone compliance inspection on the first visit. We’ll show you what’s under the shingles before we touch it, and any added scope goes through you in writing before we proceed.
If your San Martin roof is leaking, lifting, or showing its age, don’t wait for the next Pacheco Pass storm to make it worse. Call Mercer Roofing at (743) 200-8347. You’ll get a real person on the phone, a technician whose name and photo you’ll know before they arrive, and a written price before any work starts. We’ll walk your roof, check the ridge caps, the flashing, the barn, and the low-slope sections, and tell you exactly what it costs to fix. Free estimates, written guarantees, and a 365-Day Done Right Promise on every repair.
Written by Grant Whitlock, Owner at Mercer Roofing, serving San Martin since 2000.