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Owens CorningFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Fast, Reliable Roofing Company Across San Diego
Most roofs in San Diego don’t fail from storms. They fail slowly, from salt air eating fasteners near the coast, UV breaking down shingle granules inland, and fog keeping north-facing slopes damp for months. The result is leaks that show up years after the real damage started. We’re Mercer Roofing Co San Diego, and we’ve spent 25 years learning exactly how roofs deteriorate in this city’s specific conditions. From Ocean Beach to Rancho Bernardo, our Roofing Company team handles repairs and replacements with materials chosen for where you actually live, not a generic spec. Call (619) 810-5520 to schedule a free roof inspection.
Why Mercer Roofing Co San Diego Is San Diego’s Preferred Roofing Company Company
San Diego homeowners have plenty of roofers to choose from. What they tell us matters most is knowing exactly who’s coming to their door and exactly what the work will cost before it starts. Both are non-negotiable for us.
Every Mercer technician is background-checked, identity-verified, and uniformed. Before your appointment, we send you the technician’s name and photo. When they arrive, they present a photo ID badge at the door. This is the Threshold Verified standard, and it’s contractually enforced for every independently owned location in the Threshold Group family, founded in 2000.
Pricing works the same way. We put every price in writing before any work begins. Every repair includes a written guarantee, and if that repair fails within 365 days, we come back at no charge. That’s our 365-Day Done Right Promise, and it’s included on every job, every time.
Led by Grant Whitlock, our San Diego team knows which neighborhoods face the worst salt-air corrosion, where fog lingers longest, and which 1960s ranches still have original wood shake under layers of composition shingle. That local knowledge is the difference between a repair that lasts three years and one that lasts fifteen.
Styles & brands we work with
Roofing Contractor in San Diego
San Diego Roof Repair involves more than nailing shingles. In this city, the job means evaluating how coastal moisture, UV exposure, and decades of layered reroofs have affected your roof deck, flashing, and ventilation. We assess the whole system, not just the surface.
Repairs Done Right, Not Just Patched
When a roof leaks in Clairemont or Point Loma, the visible shingle damage is rarely the whole story. We inspect the flashing, the decking under the felt, and the fasteners at the eaves to find what actually failed. Then we fix it with materials suited to the exposure. A leaking pipe boot near the coast gets a stainless replacement, not another galvanized one that corrodes in six years.
Full Replacements That Account for San Diego Conditions
A full roof replacement in San Diego typically runs $9,000 to $18,000 for a standard single-family home, depending on size, pitch, tear-off layers, and material choice. Coastal homes may run higher because we specify stainless or hot-dip galvanized hardware and marine-grade flashing. Inland, an architectural shingle replacement might start around $8,500. We always provide a written line-item price before work starts, so you know exactly what the coastal-spec upgrade adds and why it’s worth it.
Roof Inspection in San Diego
A roof inspection in San Diego is the most cost-effective way to catch salt-air corrosion and UV granule loss before they become leaks. Most homeowners wait until water is coming through the ceiling, and by then the repair is always bigger and more expensive.
What We Look For
On every inspection, we check fastener condition at eaves and penetrations, flashing integrity at valleys and chimneys, decking for rot or saturation, ventilation, and the condition of your current shingle or membrane. In coastal neighborhoods like Ocean Beach and Point Loma, we pay particular attention to drip edge corrosion and granule loss on south and west-facing slopes. Inland, we look for thermal cracking from extreme UV cycling.
When to Schedule One
A roof inspection in San Diego typically costs $150 to $350, and that fee is often waived if we perform the repairs we recommend. We also recommend an inspection before buying or selling a home, after any Santa Ana wind event strong enough to move debris, and at least once every two years if your roof is over 15 years old. Call (619) 810-5520 to schedule a free estimate on any recommended work.
Trusted Brands We Service in San Diego
We install and repair roofs using manufacturer-recognized shingle brands including Certainteed in San Diego, Owens Corning, IKO, and Tamko, among others. We choose the brand based on your home’s specific exposure. A coastal home in Mission Hills benefits from an Owens Corning Duration or similar architectural shingle with strong granule adhesion and a high wind rating. An inland Ranch-style home in Allied Gardens might do better with an IKO Cambridge or Tamko Heritage line. We keep a local stock of common parts and materials for San Diego homes, which means faster turnaround on repairs and replacements. Whatever brand you choose, every installation includes a written price before work starts and a written guarantee on the workmanship.
See the difference
Before
After
Before
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Before
AfterCommon Roofing Company Problems We See in San Diego Homes
- Salt-air fastener corrosion near the coast: In Ocean Beach, Point Loma, and Coronado, standard galvanized nails and flashing corrode within 5 – 7 years. The shingles look fine, but the drip edge and pipe boots are quietly failing underneath.
- Multiple reroofs over original wood shake: Clairemont and Allied Gardens are full of 1950s – 1980s homes with two or three layers of composition shingle over original wood shake. The weight traps moisture from coastal fog, rotting the soffit, fascia, and decking before any visible shingle damage shows.
- Alligator cracking on low-slope built-up roofs: Mid-Century Modern and Ranch-style homes throughout San Diego often have flat or low-slope built-up roofs. Decades of UV thermal cycling cause the surface to crack in a pattern that looks like alligator skin, leading to ponding and deck saturation.
- Black streaks on north-facing slopes from fog and algae: The persistent marine layer keeps north-facing roof slopes damp for long stretches. That moisture promotes algae growth that appears as black streaks, and it can accelerate granule loss and shingle deterioration.
Pricing for Roofing Company in San Diego, CA
Here’s what you can expect to pay in San Diego. Minor repairs like replacing a pipe boot or a few damaged shingles run $250 to $600. Leak repairs involving flashing or deck repair run $500 to $1,200. A full roof replacement on a typical single-family home runs $9,000 to $18,000. Coastal-spec upgrades like stainless fasteners and marine-grade flashing typically add $400 to $900 to a replacement. We put every price in writing before work starts, with no change orders and no surprise line items on the final invoice. Call (619) 810-5520 for a free estimate and a written quote for your specific roof.
We Also Serve Cities Near San Diego
Our crews serve San Diego and the surrounding communities of Coronado, National City, Bonita, and Imperial Beach. If you’re in any of these areas and need a Roofing Company that treats your home as a protected place, not just a job site, call (619) 810-5520. We’ll send a background-checked, photo-badged technician with a written price before any work starts.
Serving San Diego, CA - Our Local Coverage Area
We’re based in the San Diego 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 Roofing Company in San Diego
Because salt air from the marine layer corrodes standard galvanized fasteners within 5 – 7 years in coastal zones like Ocean Beach and Point Loma, while the same fasteners might last 15+ years inland. The shingles will look fine, but the nails holding your drip edge and pipe boots are quietly rusting through. That’s why we specify stainless steel or hot-dip galvanized hardware on every coastal job, even when the rest of the system is a standard architectural shingle. Call (619) 810-5520 if you want us to check what’s actually holding your roof together.
No, and here’s why. Three layers of shingles over original wood shake means your roof deck is carrying roughly 15 – 20 pounds per square foot more than it was designed for, and the trapped moisture from fog rots the soffit, fascia, and decking from underneath. We pull everything off, inspect the decking, replace what’s compromised, and then install a new system with proper ventilation and stainless fasteners at the eaves. It costs more upfront, but a fourth layer would just accelerate the deck failure. Call (619) 810-5520 for a written estimate on a proper tear-off.
The black streaks are algae, typically Gloeocapsa magma, which thrives on the damp, shaded north-facing slopes that stay wet from San Diego’s marine layer. The algae feeds on the limestone filler in shingles, gradually degrading them. It’s mostly cosmetic at first, but if left alone for years, the constant moisture and organic growth can shorten the shingle’s service life. We can clean it or, if the roof is near the end of its service life, replace it with algae-resistant shingles. Call (619) 810-5520 if the streaks are spreading and you want an honest assessment.
Yes, in many cases we recommend a high-temperature synthetic underlayment rather than standard felt, especially on south and west-facing slopes in inland areas like Rancho Bernardo or Poway. Standard felt breaks down faster under sustained UV and thermal cycling, while synthetics hold up better through the heat and provide a better seal at penetrations. It’s a modest cost upgrade, usually a few hundred dollars on a full replacement, and it extends the life of the whole system. Call (619) 810-5520 for a written price that breaks out the underlayment spec.
A typical San Diego single-family home has between 20 and 30 squares, where one square equals 100 square feet of roof area. The number matters because every quote you receive is priced per square. If one roofer quotes for 22 squares and another for 28, you’re not comparing equal bids. When we inspect your roof, we measure accurately with satellite and field verification, then provide a written line-item quote that states the exact square count, tear-off layers, material spec, and hardware type. That’s the only way to compare quotes honestly. Call (619) 810-5520 to get your roof measured and priced in writing.
Written by Grant Whitlock, Owner at Mercer Roofing Co San Diego, serving San Diego since 2000.