Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
Before
After
Before
After
Before
AfterFast, Reliable Roofing Company Across Gilroy
If you need a roofing company in Gilroy, CA, the core question is usually the same: what will it cost, and who exactly is coming to my door? At Mercer Roofing, a typical roof repair in Gilroy runs $450 – $1,200, and a full roof replacement on a standard single-story tract home runs $14,000 – $22,000 depending on square footage, tear-off, and access. Every job starts with a written price before any work begins, and every technician who arrives at your door will be someone we’ve already introduced to you by name and photo. Call (743) 200-8347 to schedule a free estimate.
We know Gilroy. Not just the map. We know the fog that sits on north-facing slopes in Eagle Ridge every summer morning, the tight lots near downtown where a dumpster won’t fit, and the 1990s-era tract homes whose original roofs are all reaching end-of-life within a few years of each other. That local knowledge changes what we recommend, how we stage the job, and what we put in writing before the first nail goes on.
Why Mercer Roofing Is Gilroy’s Preferred Roofing Company Company
Homeowners in Gilroy call us because we solve the problem most roofers ignore: the stranger-at-the-door risk. Before any Mercer technician arrives, you get their name and photo sent to you. When they arrive, they’re in a clean, marked uniform with a photo ID badge. That’s the Threshold Verified standard, and it’s contractual, not optional. Every Mercer location is independently owned and operated, but every technician is background-checked, identity-verified, and held to the same Threshold Group quality framework that has been in place since 2000.
Our Roofing Company team carries a strong reputation across Gilroy. Homeowners repeatedly mention the badge-at-the-door promise in reviews, along with the written guarantee we include on every repair. If a repair fails within 365 days, we come back and fix it at no cost. That guarantee is written, not implied, and it applies to every repair we do in Gilroy.
Response time matters. Our dispatch and scheduling are coordinated from the brand’s San Francisco Bay Area office, and our crews serve Gilroy locally, so we’re not routing a crew from two counties away. Scheduling is straightforward, the crew arrives when we say they will, and a live person answers the phone 24/7. Not a voicemail. Not a call-back form. A real human being.
Roofing Contractor in Gilroy
A roofing contractor in Gilroy handles what most homeowners can’t safely do themselves: tear-off, decking, flashing, underlayment, shingle installation, and the permits that come with structural work. Gilroy’s specific climate, with the Pajaro Gap fog and 100-degree afternoons, means a contractor should also know local failure modes, like moss on north-facing slopes and granule loss from rapid heating cycles. A licensed contractor in Gilroy charges anywhere from $450 for a small repair to $22,000 for a full replacement on a large two-story home, all depending on scope and access. Mercer Roofing writes the exact price down before work starts, every time.
When Gilroy Homeowners Need One
Most calls come from homeowners who see water stains on a ceiling, missing shingles after a winter storm, or moss creeping across a north-facing roof plane. Others call when a 20-year-old roof is nearing the end and they want a professional assessment before listing a home. If the roof is older than 15 years or you see granule loss in gutters, it’s worth getting a contractor out before small leaks become decking rot.
What a Contractor Should Include
A roofing contractor in Gilroy should include three things in writing: a line-item price, a scope of work, and a workmanship warranty. Mercer Roofing includes all three, plus a 365-Day Done Right Promise on every job. If something isn’t right within the year, we make it right.
Roof Inspection in Gilroy
A roof inspection in Gilroy is the most cost-effective way to catch the early signs of Pajaro Gap moisture damage before a repair becomes a replacement. A thorough inspection here runs $250 – $450, and it includes a visual check of shingles, flashing, ridge caps, underlayment, decking, and gutters. Given Gilroy’s morning fog pattern and hot afternoons, we pay particular attention to north-facing slopes and chimney flashing, where moisture and expansion cycles do the most damage over time.
What We Look For
We inspect for granule loss, cracked sealant strips, moss growth, rusted flashing, lifted shingles, and soft decking. The Pajaro Gap’s overnight moisture means we also look for trapped moisture under older underlayment, which can rot decking even when the shingles above look fine from the ground. This is the most commonly missed failure point on Gilroy roofs built in the 1990s and early 2000s.
When Gilroy Homeowners Should Schedule One
Schedule an inspection before the rainy season, after any winter storm that drops branches or heavy rain, and before buying or selling a home in Gilroy. If the roof is 15 years old or older, annual inspections are a sensible insurance policy. The inspection report gives you a written, prioritized list, so you know what’s urgent and what can wait.
Trusted Brands We Service in Gilroy
We install and repair shingle roofs using manufacturer-recognized brands including GAF, CertainTeed, and Owens Corning. We know Gilroy’s housing stock, so we’re prepared for 3-tab replacements, architectural shingle upgrades, and the specific underlayment needs that come with Pajaro Gap moisture. We source materials locally where possible, which means faster turnaround on common repairs and warranty-backed installs. If you want a specific shingle brand or color to match an existing roof on your block, tell us during the estimate and we’ll line it up.
Common Roofing Company Problems We See in Gilroy Homes
- Moss on north-facing slopes: The Pajaro Gap fog keeps north slopes damp every morning, even in July. Homeowners who skipped algae-inhibiting underlayment or zinc ridge strips often see heavy moss within 3 – 5 years, and that moss lifts shingles and traps moisture against the decking.
- Granule loss from thermal cycling: Gilroy roofs go from fog-wet and cool at dawn to 100+ degrees by mid-afternoon. That compression-expansion cycle cracks sealant strips and sheds granules faster than regional climate data alone would suggest.
- Staging problems on tight lots: Downtown Gilroy and older west-side blocks have narrow driveways, shared walls, and little street frontage. When a dumpster can’t fit, crews have to stage in the street with a permit, and a contractor who doesn’t plan for that will delay the job and annoy the neighbors.
- Simultaneous end-of-life roofs: Gilroy’s 1990s – 2000s tract developments, like Eagle Ridge, were built in a relatively short window. That means a whole neighborhood’s original 3-tab roofs hit 25 years around the same time, and we’re now replacing many of them in the same season.
Pricing for Roofing Company in Gilroy, CA
Here’s what homeowners in Gilroy should expect to pay. A roof inspection runs $250 – $450. A minor repair, like a few lifted shingles or a small flashing fix, runs $450 – $800. A mid-sized repair involving decking or underlayment runs $900 – $1,200. A full roof replacement on a standard one-story tract home in Gilroy runs $14,000 – $22,000, depending on square footage, roof pitch, access, and whether we’re doing a tear-off or an overlay. Steep roofs, two-story homes, and tight lots where we need a street permit and conveyor will land at the higher end of that range. Call (743) 200-8347 to schedule a free estimate with a written line-item quote, no work starts without it.
We Also Serve Cities Near Gilroy
Mercer Roofing works with homeowners across the south Santa Clara Valley. Beyond Gilroy, our crews regularly serve San Martin, Morgan Hill, Los Gatos, and Campbell. If you’re just outside the Gilroy city limits, call us and we’ll let you know our next available date. The same Threshold Verified standard, written pricing, and 365-Day Done Right Promise applies everywhere we work.
Serving Gilroy, CA - Our Local Coverage Area
We’re based in the Gilroy 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 Gilroy
Gilroy sits at the southern end of the Santa Clara Valley where the Pajaro Gap funnels cool, moisture-laden marine air inland from Monterey Bay. That fog settles on north-facing slopes overnight and lingers every morning, even when afternoon temperatures pass 100°F. The result is a roof surface that stays damp long enough to sustain moss and algae, particularly on slopes that get little direct sun. The fix is algae-inhibiting underlayment, zinc ridge strips, and periodic cleaning. Call (743) 200-8347 and we’ll inspect your roof and recommend the right prevention for your slope and exposure.
We plan access before we quote. On a tight lot in the Eagle Ridge neighborhood, our crew replaced a 22-year-old 3-tab asphalt shingle roof that had heavy moss on the north slope despite the homeowner thinking Gilroy was too hot for that. Because the driveway was too narrow for a dumpster, we staged materials in the street with a permit and used a conveyor to get squares up without blocking the neighbor’s shared driveway. When we quote your roof, we factor in dumpster placement, street permits, and material staging, so the price you see is the price it costs to actually do the job on your lot.
Yes, roof replacements in Gilroy require a building permit through the city. The timeline depends on current permit review windows, but typically a standard re-roof permit clears within a week or two. Mercer Roofing pulls the permits, schedules the inspections, and walks the job through final sign-off. We don’t start work until the permit is issued and the written price is agreed to. If you want an exact current timeline, call (743) 200-8347 and we’ll tell you what we’re seeing from the city right now.
For Gilroy, we recommend a synthetic underlayment with, on north-facing slopes, an algae-inhibiting product and zinc ridge strips. The Pajaro Gap fog keeps north slopes damp every morning, and standard felt or basic synthetic underlayment on those slopes traps moisture and accelerates decking rot. On lower roof sections and valleys, we also recommend ice and water shield. Skipping algae-inhibiting underlayment or zinc strips on Gilroy installs often leads to moss within 3 – 5 years, and those failures are the most common source of warranty disputes in the local market. Call (743) 200-8347 for a recommendation specific to your roof’s pitch and exposure.
Access is a real line item in Gilroy, not a footnote. Tight lots near downtown, narrow driveways in Eagle Ridge, and streets with restricted parking all change how we stage materials, where a dumpster can sit, and whether we need a street permit or a conveyor. Those logistics add real cost and time. Our written quotes account for access up front, so there are no change orders when we show up and find the driveway won’t fit a truck. Call (743) 200-8347 for a free estimate based on your actual lot, not a generic square-footage formula.
Written by Grant Whitlock, Owner at Mercer Roofing, serving Gilroy. Mercer Roofing is part of the Threshold Group family, founded in 2000, and every location is independently owned and operated under the Threshold Verified standard.