Free roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
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AfterFast, Reliable Roofing Company Across St. Helena
Roofing work in St. Helena is not the same as roofing work in Napa or Santa Rosa. A roof replacement here usually means navigating Napa County’s WUI fire code, tearing off shake that is no longer legal to reinstall, and scheduling crews around long acreage driveways off Silverado Trail or Howell Mountain Road. Mercer Roofing handles all of it. We send a background-checked, photo-badged technician whose name you have before anyone knocks, and you get a written price before the first nail is driven. For a free estimate in St. Helena, call (743) 200-8347.
Grant Whitlock leads our St. Helena roofing work, and every job he scopes starts the same way: we look at the roof, we look at the access, we check whether the property sits on a county lot with septic and well setbacks, and then we put the full price in writing. No allowances, no open-ended change orders. Just a number you can hold us to for 365 days if the work is not right.
Why Mercer Roofing Is St. Helena’s Preferred Roofing Company
St. Helena homeowners call us because they want to know exactly who is coming to their door. Every Mercer technician is background-checked, identity-verified, and dispatched under the Threshold Verified standard. Your technician’s name and photo are sent to you ahead of the visit. When they arrive, they present a photo ID badge at the door, in a clean marked uniform. That’s the Threshold Standard, and it’s written into the contract for every independently owned Threshold Group location, including ours.
We answer our phones 24/7 with a live person. Not a voicemail tree, not a callback form. When a St. Helena homeowner calls at 7 a.m. about a leak over the kitchen, a human picks up. That matters more than most people expect.
Our written guarantee is specific: every repair we complete includes a 365-Day Done Right Promise in writing. If the work fails within a year, we make it right at no cost. That’s paired with a written price before any work starts, every time. There is no estimate style at Mercer that ends with an invoice that has different numbers on it.
Our Roofing Company team works with manufacturer-recognized shingle brands including GAF and CertainTeed, and for the wine-country estates and winery structures surrounding St. Helena, we routinely install standing-seam metal and clay tile systems. The material choice here is not just aesthetic; it is dictated by fire code and by what the county will permit.
Residential Roofing in St. Helena
Residential Roofing in St. Helena means working on homes built between the 1880s and the 1910s, with steep Victorian gables, boxed eaves, and aging decking that has never been opened since the original installation. When a homeowner calls us for a full residential re-roof, the job typically involves a complete tear-off to the decking, replacement of rotted fascia and soffit, new underlayment, ice and water shield in valleys and penetrations, and a Class A fire-rated shingle or standing-seam system that satisfies Napa County’s Chapter 7A WUI requirements. On a standard late-Victorian home in town, a full tear-off and composition shingle re-roof in St. Helena runs $14,000 to $24,000 depending on roof pitch, decking repair, and the number of layers being removed. On larger acreage homes off Howell Mountain Road or near Spring Mountain, that range climbs to $22,000 to $38,000, driven mostly by access and material delivery logistics.
Tear-Off and WUI-Compliant Re-Roofs
The majority of our St. Helena residential work is full tear-offs that replace wood shake or early composition shingles. Many homeowners arrive at the conversation wanting like-for-like replacement, and part of our job is explaining, with the county’s own permitting language, why the old roof cannot legally go back on. We handle the permit through Napa County, not the city, and we scope the job only after the county confirms the path. That sequencing alone prevents the most expensive mistake we see in this market: a quote written before the WUI rules are verified.
Steep-Pitch Victorian and Craftsman Roofs
St. Helena’s original housing stock has steeply pitched rooflines, often 8:12 or steeper on Victorian gables and Craftsman bungalows. That pitch changes the labor and the staging requirements meaningfully. Crews need roof jacks, safety harnesses, and more time per square than on a low-slope tract home in the East Bay. We include that in the written quote, not as a surprise line item later. If the decking under the old shake is too far gone, we replace it board by board and show you photos before the new roof goes on.
Roof Maintenance in St. Helena
Roof Maintenance in St. Helena is the most under-bought service in this market, mostly because homeowners do not see what the valley’s heat and fog do to a roof until water is already inside the house. A maintenance visit from us includes a full visual inspection of flashing, penetrations, valleys, and the underside of the attic where accessible. That work runs $350 to $650 on a typical in-town home, and more on steep roofs or acreage parcels where access takes longer. The value is not the inspection itself; it is finding a failing pipe boot or a lifted section of flashing before the first winter rain introduces water into a lath-and-plaster ceiling.
Seasonal Tune-Up Before the Wet Winter
St. Helena gets roughly 35 inches of rain in an average year, and the wet season is when almost all of our emergency leak calls come in. The most common failure point we see is not the shingle field. It is the flashing where a masonry chimney meets the roof, or where an older valley has been relying on tar that has dried out over a 100-degree Napa Valley summer. A pre-winter tune-up catches these for a few hundred dollars, versus a water-damage repair that costs thousands. We recommend St. Helena homeowners schedule this in September or early October, before the first atmospheric river arrives.
Post-Storm and Post-Heatwave Checks
After a stretch of 100°F-plus days, we also recommend a visual check. The thermal cycling on asphalt shingles in St. Helena is more aggressive than in coastal markets because the valley floor holds heat overnight. Shingles crack, nails back out, and seal strips fail. We send a technician out, document what we find with photos, and give you a written repair quote only if something actually needs work. A maintenance-only visit never turns into a pushed replacement.
Trusted Brands We Service in St. Helena
We install and repair shingle systems from GAF, CertainTeed, and Owens Corning, and we stock common flashing, underlayment, and ridge components locally so St. Helena jobs do not wait on material runs from the Bay Area. For the standing-seam and tile systems common on winery properties and estate homes, we work with manufacturer spec sheets and submit warranty paperwork directly. If your roof carries a GAF or CertainTeed warranty, we handle the repair or replacement work in a way that preserves the manufacturer’s coverage. We do not sell a brand we would not put on our own roof, and we do not substitute brands once a written quote is signed.
Common Roofing Company Problems We See in St. Helena Homes
- Shake roofs that can’t legally be reinstalled. Homeowners call us wanting like-for-like wood shake replacement, and we have to explain that Napa County’s post-Glass Fire WUI rules prohibit it. That conversation changes the entire scope, and it’s a St. Helena-specific reality that lower-hazard valley towns to the south rarely face.
- Long acreage driveways eating the quote. Properties off Howell Mountain Road or Silverado Trail can have half-mile drives with tight turnarounds. Material delivery, dumpster placement, and equipment access add real cost that a roofer who has never visited the site cannot possibly quote accurately.
- Winery outbuildings treated as an afterthought. Barrel halls, cave entries, and detached tasting rooms have their own roof assemblies and their own fire-code triggers. When a contractor lumps them in with the residential structure, the scope gets thin and the permit review catches it late. We scope every structure separately.
- Old flashing done in tar instead of metal. On the town’s original Victorian homes, we frequently find valley and chimney flashing built up with tar that has hardened and cracked. The resulting leak often looks like a roofing problem, but the fix is proper metal flashing work at a fraction of what a full replacement would cost.
Pricing for Roofing Company in St. Helena, CA
Here is what we tell St. Helena homeowners before they commit to anything. A straightforward asphalt shingle re-roof on an in-town home with moderate pitch and intact decking runs $14,000 to $24,000 for a full tear-off. If the decking is rotted or the roof is especially steep, plan for $18,000 to $28,000. Acreage homes with long driveways and fire-code complexities on county parcels typically fall between $22,000 and $38,000. Maintenance visits run $350 to $650. Repairs, like a valley re-flash or a valley liner replacement, run $450 to $1,800 depending on what has failed. The written price we give you before any work starts is the price you pay; our 365-Day Done Right Promise covers the workmanship.
Call (743) 200-8347 and we will put a specific number on your roof in writing. Free estimate, no pressure, and the person who shows up is the person whose name and photo you already have.
We Also Serve Cities Near St. Helena
Our roofing crews regularly work across the wider region, and we serve homeowners in Los Angeles, San Diego, San Jose, and San Francisco with the same written-price and photo-badged technician standard. If you have a property outside St. Helena proper, we can guide you to the right service path for that area without losing the quality bar. Start with a call to (743) 200-8347.
Serving St. Helena, CA - Our Local Coverage Area
We’re based in the St. Helena 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 St. Helena
Because St. Helena sits inside a state-designated Very High Fire Hazard Severity Zone, and after the 2020 Glass Fire, Napa County’s WUI permitting prohibits reinstalling wood shake roofs on homes that require a re-roof. The only legal path is a Class A fire-rated assembly, typically composition shingle with ember-resistant venting or standing-seam metal. We walk you through the county permit language before you spend a dollar. Call (743) 200-8347 and we will verify your specific parcel’s requirements free.
Permitting for roofing on most St. Helena parcels goes through Napa County, not the city, because of the WUI fire-code overlay. That changes review timelines, required documentation, and the specific assemblies the county will approve. We handle the permit submission and pull it in our name. The cost of permitting is included in our written quote, and we never start work without the permit in hand.
A half-mile driveway off Howell Mountain Road or Silverado Trail adds material delivery time, dumpster placement logistics, and crew access time to every day of the job. A roofer quoting from a satellite photo undershoots that cost. We visit the site before quoting, every time. When we write the price, the access is already scoped. That is why our written quote is the number you pay.
Yes, each structure gets its own scope and its own price. A detached shop or ADU on a St. Helena county lot triggers separate drainage, septic, and well-setback review that a residential roof does not. Treating it as a small add-on is how quotes go wrong. We inspect each structure, scope each one independently, and itemize them on your written estimate. Call (743) 200-8347 and we will add them to your quote correctly.
Ask whether the quote is written before work starts, whether the permit is pulled by the roofer, whether decking repair is included or an extra, and whether the guarantee is in writing for a full year. Ask specifically whether the roofer has verified the Napa County WUI requirements for your parcel. If the answer on any of those is vague, that bid is not comparable to ours. We answer all four in writing on every St. Helena job.
What Actually Happens When We Roof a St. Helena Home
We were called to a 1900s Victorian off Spring Street where the original wood shake was already shedding onto the ground after a dry summer. The homeowner wanted a like-for-like replacement. We had to walk them through why Napa County’s WUI rules prohibit reinstalling shake. We tore off to the decking, replaced rotted fascia and soffit sections, installed ice and water shield in the valleys and along penetrations, then set a Class A architectural shingle system with starter strip, drip edge, and ember-resistant ridge vent. All of it was permitted through the county, not the city. The homeowner never had to argue with an inspector or explain a scope they did not sign up for. That is how Grant Whitlock runs every St. Helena job: the hard conversations happen before the work starts, not after the invoice arrives.
This page exists because St. Helena is not a generic roofing market. The Very High Fire Hazard Severity Zone designation, the Napa County WUI permitting path, and the acreage access logistics off Silverado Trail and Howell Mountain Road change what a quote must include. A roofer who has never dealt with a prohibited shake roof or a half-mile driveway cannot scope this town correctly. We can, because we do it every week here.
Get Your Written St. Helena Roofing Estimate
Call (743) 200-8347 and talk to a live person, any hour. We will schedule a St. Helena visit, send you the technician’s name and photo before they arrive, and put your roofing price in writing. Nothing starts until you approve it. That is the only way Grant Whitlock runs a roofing project in this town.
Written by Grant Whitlock, Owner at Mercer Roofing, serving St. Helena since 2000.