Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roof Replacement Across Gilroy
A full roof replacement in Gilroy typically runs between $12,000 and $28,000 depending on your roof’s size, slope, material, and whether the decking beneath is still sound. That’s the honest range before anyone climbs a ladder. At Birchbark Roofing, we start every Gilroy job with a written price in dollars, not a vague verbal ballpark, and we scope the things that actually move cost on a Gilroy roof: fire-zone requirements in the eastern foothills, skip-sheathing on older downtown homes, and the Hecker Pass fog-bake cycle that chews through shingles faster than a flatland address. If you’re weighing a replacement, call (424) 766-4937 and we’ll walk the roof with you and tell you what we see.
Why Birchbark Roofing Is Gilroy’s Preferred Roof Replacement Company
Gilroy homeowners call us for a specific reason: we scope the job like we actually live here. That means when we quote a replacement on an Eagle Ridge home, the bid already accounts for Class A fire-rated assemblies and ember-resistant drip edge, because that address sits in a Very High Fire Hazard Severity Zone even if the existing roof passed a past inspection. On a 1940s bungalow near downtown, we check for original skip-sheathing before we promise a price, because discovering rotted decking after tear-off is the most common way a Gilroy replacement goes over budget. Our crews are background-checked and uniformed, and they arrive with shoe covers and drop cloths because your floors matter as much as your roof deck. Erik Lindgren, who leads Birchbark Roofing, is the person who set that standard, and he holds every Gilroy job to it.
We’re part of the Cedarwell family of independently owned roofing businesses, which has been roofing since 2000. The 365-Day Done Right Promise is stamped on every Birchbark job: if the work isn’t right, we make it right. That’s a promise in writing, not a handshake. When you call, a live person answers 24/7. You’ll never sit through a voicemail tree at 9 pm when a Diablo wind gust just lifted a section of flashing and you need someone to talk to.
Roof Replacement Contractor in Gilroy
A Roof Replacement Contractor in Gilroy handles full tear-offs, re-decking, underlayment, flashing, and the new roof system from ridge to drip edge. We see two very different Gilroy houses on our bid list. The first is a 1990s or early 2000s tract home in Glen Loma Ranch where the original dimensional shingle roof is now 15 to 25 years old and has hit its first replacement cycle. The second is a pre-1960s wood-frame home near the historic downtown core where original low-slope built-up roofs sit over skip-sheathing that modern tile and architectural shingles simply can’t carry without a full decking replacement.
Full roof replacement in Gilroy on a standard tract home runs $12,000 to $20,000 for asphalt shingles, while architectural shingles and tile systems push that to $18,000 to $28,000. Re-decking adds $2 to $4 per square foot when the old deck is shot, which is common on the older downtown bungalows. You’ll see your exact number in writing before we start, and it won’t change unless we uncover something structural during tear-off, in which case we stop and show you photos before spending another dollar.
Scoping an acreage job
Building on acreage around Gilroy means county permitting rather than city, and that changes the job before we ever set up a ladder. We check septic and well setbacks so equipment staging doesn’t compact a leach field, we plan material hauls for long rural driveways that a flatbed can’t always navigate, and we quote for outbuildings, shops, and detached ADUs as part of the same job rather than treating them as an afterthought. Grading and drainage on an open lot is part of our scope review: if winter storm water ponds against the fascia on the north side of your shop, that has to be fixed before a new roof goes on over the same rot source.
Asphalt Shingle Roof Replacement in Gilroy
Asphalt Shingle Roof Replacement in Gilroy is the most frequent job we do, and it has a Gilroy-specific wrinkle: the overnight Hecker Pass fog that settles on west- and north-facing roof planes, then bakes off past 100°F by early afternoon. That moisture-then-extreme-heat cycle works on shingle granule adhesion harder than most inland valley addresses ever experience, and it’s why we see shingle roofs in Gilroy showing wear at 10 to 12 years that a San Jose roof wouldn’t show until 18. When we quote an asphalt shingle replacement in Gilroy, we factor in that reality, not a generic manufacturer chart.
Standard dimensional asphalt shingle replacement on a Gilroy tract home runs $12,000 to $18,000 for a typical 1,800 to 2,400 square foot single-story roof. Upgrading to architectural shingles, which hold up better against the Gilroy heat cycle and give you a thicker granule surface, adds $2,000 to $6,000 depending on the roof’s pitch and complexity. We work with GAF, CertainTeed, and Owens Corning products as our primary asphalt lines, and we’ll show you the warranty differences in plain language before you choose.
Underlayment and flashing upgrades
On every Gilroy asphalt replacement, we quote ice and water shield in the valleys and along the eaves, not just standard felt. The Diablo wind events each autumn hit unseated flashing hard, and a lifted starter strip edge is an open invitation for wind-driven rain and, in the eastern foothills, ember intrusion. We also recommend ember-resistant drip edge on any property within a mile of the Diablo Range interface, even if the code minimum doesn’t strictly demand it. That’s the difference between a roof that meets the letter of the law and one that’s actually prepared for the autumn wind season.
Trusted Brands We Service in Gilroy
We install and service roofs from GAF, CertainTeed, Owens Corning, and IKO, which means we can match your existing roof on a partial replacement or give you a meaningful upgrade on a full one. For Gilroy customers, we stock common shingle colors and accessory parts locally so lead times don’t stretch into the weeks you can’t afford with an open roof. If you have a warranty question on a GAF or CertainTeed roof that’s only 10 to 12 years old and already streaking on the north slope, we’ll inspect it and tell you honestly whether it’s a material issue or the Hecker Pass fog cycle doing what it does.
Common Roof Replacement Problems We See in Gilroy Homes
- Skip-sheathing on downtown bungalows. Original 1940s and 1950s decks were built with gaps between boards for cedar shakes, and modern tile or architectural shingles can’t be nailed to that surface. Full re-decking is required, and it adds $2 to $4 per square foot that many homeowners don’t learn about until tear-off reveals it. We scope for this before quoting by checking the attic when accessible and flagging it in writing.
- Premature granule loss on north slopes. Fog rolls in overnight through Hecker Pass, soaks west- and north-facing planes, and then the Gilroy sun bakes the shingles past 100°F within hours. That rapid cycle strips granules and causes algae streaking years ahead of warranty expectations. We see it on 10 to 12-year-old roofs constantly.
- Diablo wind damage to flashing and starter strips. Autumn offshore winds hit gaps in flashing and unseated starter strip edges, lifting them enough to let rain in or, worse, to create an ember entry point on foothill homes. We re-seat and reinforce flashing as part of every Gilroy replacement, not as an optional add-on.
- Ponding water against fascia on acreage properties. Open-lot grading problems let winter storm runoff sit against the roof edge, rotting fascia and soffit from below even when the shingle field looks fine. We inspect the drainage around the structure and flag grading fixes before the new roof goes on.
Pricing for Roof Replacement in Gilroy, CA
Here’s what moves the number on a Gilroy roof replacement, and it’s rarely the shingles themselves. A standard dimensional asphalt roof on a 1990s Glen Loma Ranch tract home runs $12,000 to $18,000. A full concrete tile or architectural shingle replacement with re-decking on an older downtown bungalow or an eastern foothills home with fire-zone detailing runs $20,000 to $28,000. Acreage jobs with outbuildings, shops, or detached ADUs go above that depending on square footage and access. Every quote from Birchbark includes the written price before any work starts, and we tell you what we saw in the attic, on the deck, and along the drainage line. Call (424) 766-4937 and we’ll walk the property with you. The estimate is free.
We Also Serve Cities Near Gilroy
Our crews cover Gilroy and the surrounding South County communities, including San Martin, Morgan Hill, Los Gatos, and Campbell. If your roof sits in the foothills west of San Martin or on a canyon lot outside Morgan Hill, the same fire-zone and thermal-cycle scoping applies, and we bring it to every estimate. The Roof Replacement process is easier to understand when someone explains the local part of the equation, so call and ask us anything.
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 Roof Replacement in Gilroy
Yes. If you live in the eastern foothills subdivisions like Eagle Ridge that fall inside California’s Very High Fire Hazard Severity Zones, your replacement is scoped around Class A fire-rated assemblies and ember-resistant detailing, including drip edge and venting that resists ember intrusion. That’s true even if your existing roof passed a past inspection; the code and insurance requirements have moved. We build that into the quote from the first bid rather than surprising you at permit time. Call (424) 766-4937 for a fire-zone-specific estimate.
We walk every structure that needs a roof, including the house, shop, detached ADU, and any outbuilding, and we treat them as one job with one written price. We also check septic and well setbacks before staging equipment, plan material delivery for long rural driveways, and flag grading or drainage problems that are letting water sit against the fascia. That’s the difference between a bid that fits the property and one that assumes a standard suburban lot. Call us at (424) 766-4937 and we’ll come walk the acreage.
Because overnight marine fog funnels through Hecker Pass and soaks west- and north-facing roof planes, and then those same surfaces bake past 100°F by early afternoon. That moisture-then-extreme-heat cycle strips shingle granules and causes algae streaking years before a generic manufacturer chart predicts. It’s a Gilroy-specific condition, and it’s why we quote underlayment and shingle choices that hold up to it rather than treating Gilroy like a generic inland valley address.
Almost never. The original skip-sheathing under those pre-1960s roofs has gaps between boards, and modern tile and architectural shingles can’t be nailed to it safely. The decking has to be replaced as part of the job, which adds $2 to $4 per square foot. We inspect the attic when possible and flag this in writing before you sign anything, so the re-decking cost is in the quote, not a surprise after tear-off. Call (424) 766-4937 for an honest scope of your downtown roof.
Ask whether the bid includes re-decking if the original deck turns out to be skip-sheathing or rotted, whether fire-zone detailing like ember-resistant drip edge is in the scope if you’re in the eastern foothills, and whether the price is written in dollars before work starts rather than given as a verbal range. At Birchbark, the written price is always included, never optional, and we don’t change it unless we uncover something structural and show you photos first. Call (424) 766-4937 for a free estimate built on those terms.
Written by Erik Lindgren, Owner at Birchbark Roofing, serving Gilroy and the South County foothills.