Roof Installation in St. Helena - Free Inspection, Itemized Written Quote

Fast, Reliable Roof Installation Across St. Helena

Roof installation in St. Helena, CA runs $14,500 to $42,000 for a full tear-off and replacement on a typical 2,000-square-foot home, with standing seam metal and tile on the higher end. That’s the honest range. We’ve torn off enough aged wood shake on Spring Street and Madrona Avenue to know exactly what drives the number, and we’ll show you the line items before we ever order materials. If your roof is failing or you’re planning a re-roof, call (743) 200-8347 for a written estimate. No one in St. Helena should have to guess what their roof will cost.

Call (743) 200-8347

We schedule local crews throughout the St. Helena area, from the historic core off Main Street up into the hillside parcels along Deer Park Road. Scheduling and dispatch are coordinated from our Los Angeles office, but the men and women showing up at your door live and work in Napa County. They know the valley heat, the tule fog, and the fire code.

Here’s what to know before you call:

• Written price before any work starts. Not an estimate range. A fixed number.
• Every technician is background-checked, identity-verified, and photo-badged. We send their name and photo before they arrive.
• 365-Day Done Right Promise. If the installation isn’t right within a year, we make it right.
• A live person answers 24/7. No voicemail, no call-back form. You reach a human.

Why Mercer Roofing Is St. Helena’s Preferred Roof Installation Company

St. Helena homeowners keep hiring us because we tell the truth about what a roof costs and who will be on the property. Grant Whitlock, who leads Mercer Roofing, built the company around a simple idea: a homeowner should know the name and face of every person entering their gate before that person rings the bell. That matters in St. Helena, where many homes sit on private lanes and vineyard-adjacent parcels where an unmarked truck gets noticed.

Our crews show up in clean, marked uniforms with photo ID badges. Every technician is background-checked under the Threshold Verified standard, and each independently owned Mercer location is contractually held to that same framework. You’ll know who’s coming, what they’ll do, and what it costs, in writing, before the first shingle comes off.

We’ve handled steep late-Victorian tear-offs on Spring Street, estate homes along Lodi Lane, and winery structures throughout the St. Helena AVA. When a homeowner tells us their roofer said they could “just re-shingle over the old shake,” we walk them through Napa County’s WUI rebuild rules and show them why that answer no longer works here.

Standing Seam Metal Roof in St. Helena

Standing seam metal roof installation in St. Helena runs $19,000 to $38,000 on a typical single-family home, with the price driven by roof pitch, panel gauge, and whether we’re tearing off one layer or two. St. Helena’s fire code makes this one of the smartest material choices in the valley: a metal panel system with a Class A fire rating clears Chapter 7A requirements outright, and it sheds embers instead of catching them. We see a lot of homeowners choose standing seam after learning their wood shake can’t legally go back on.

The job starts with a full tear-off. On older St. Helena homes we almost always find rotted decking where tule fog sat for years under low-ventilated attics. We replace bad plywood, lay synthetic underlayment or ice and water shield, set new drip edge, and install the panels over a lock-strip system. Ember-resistant ridge vent and new flashing at valleys and penetrations close the assembly.

Panel Gauges and Fastener Specs

We spec 24-gauge Galvalume or painted steel for most St. Helena homes; 22-gauge where branches or ladders are likely. Every fastener is stainless or hot-dip galvanized. Standard zinc-coated hardware fails early in valley air, especially where salt-laden fog lingers from the bay and coastal influences meet 100°F summer thermal cycling. Cheap fasteners cost less up front and more within a decade.

Estates, Barrel Halls, and Winery Structures

For winery and estate buildings around St. Helena, we bid standing seam in architectural colors, often with snow country details borrowed for seismic movement at valley-side walls. These are custom-cut on site, not dropped from a distributor. The result holds up under heat, fog, and the occasional hard storm rolling off the Mayacamas.

Tile Roof in St. Helena

Tile roof installation in St. Helena runs $24,000 to $44,000 for a standard single-family home, depending on whether you choose concrete or clay, the roof’s pitch, and how much underlayment replacement the deck demands. Tile reads as the natural choice for St. Helena’s Mediterranean and wine-country architecture, and it carries a Class A fire rating when installed over the right assembly. For homeowners who want the look their house was designed for without any fire-code compromise, tile is the answer.

The real cost driver on tile in St. Helena is underlayment. The valley’s heat bakes old felt paper brittle, and tule fog finds every seam. We replace underlayment on every tile job, and on steep Victorians we often add battens and improved ventilation to keep the attic from cooking the underside of the deck.

Clay vs. Concrete on St. Helena Homes

Clay tile costs more but holds color for decades under UV, which matters when summer highs pass 100°F regularly. Concrete tile is heavier and less expensive, but needs periodic sealing. Both require structural checks on older homes; many late-Victorian rafter assemblies were never engineered for the weight of a tile roof.

Winery and Estate Applications

For larger St. Helena estate and winery structures, we’ve installed clay and concrete tile over reinforced decks with upgraded fastening. These are long-duration projects with scaffold time and careful flashing work at parapets and valleys. We bid them honestly so the number on paper is the number at the end.

Trusted Brands We Service in St. Helena

We install and repair roofs using manufacturer-recognized shingle and panel systems from GAF, CertainTeed, and Owens Corning, along with standing seam and tile systems specified to St. Helena’s fire and weather conditions. If a manufacturer offers a warranty, our installation meets their requirements so the warranty actually stands. For St. Helena customers, that means we order directly from local distributors and can usually have materials staged within a few days of the signed contract.

Common Roof Installation Problems We See in St. Helena Homes

• Aged wood shake that can no longer be reinstalled. We see late-Victorian homes on Spring Street, Hunt Avenue, and Madrona Avenue still wearing their original or early shake. Under Chapter 7A WUI rules, that material is done. The tear-off isn’t optional, and homeowners who didn’t plan for it need honest numbers fast.
• Rotted decking under old tile and shake. St. Helena gets roughly 35 inches of rain in a wet year, and the tule fog that settles in the valley keeps roof decks damp for weeks. We routinely replace 20 to 40 percent of the decking on older homes.
• Premature fastener and flashing failure. Salt-laden air off the valley, combined with 100°F summer thermal cycling, chews through standard galvanized hardware. We see rusted flashing, failed pipe boots, and corroded fasteners on roofs less than fifteen years old. Every replacement we install uses stainless or hot-dip galvanized components.
• Underventilated attic assemblies. Many late-Victorian and Craftsman homes in St. Helena were built with minimal attic ventilation. Heat builds up, shingles cook from both sides, and moisture condenses under the deck. We address ventilation on every installation, not just the surface you can see from the street.

Pricing for Roof Installation in St. Helena, CA

We Also Serve Cities Near St. Helena

Most of our St. Helena work stays in Napa County, but we do schedule installations for homeowners in Los Angeles, San Diego, San Jose, and San Francisco who want the same written pricing and background-checked crews. If you’re just outside the valley and wondering about coverage, call (743) 200-8347 and ask.

FAQs About Roof Installation in St. Helena