How much does a metal roof cost in the North Bay: standing seam or stone-coated?

What's the difference between standing seam and stone-coated steel?

Standing seam is long steel or aluminum panels joined by raised seams, with fasteners hidden under the seam. It has a clean, modern look and suits simple roof shapes. Stone-coated steel is steel formed into shingle, shake or tile profiles and coated with granules, so it reads as a traditional roof from the street.

How does metal compare with asphalt on price?

The Cost vs. Value report prices a metal reroof well above the asphalt-shingle job of the same size, and both are in the tens of thousands of dollars. Standing seam typically sits above stone-coated steel because the panels are custom-length and labor-intensive. We don't publish per-square prices; the drivers below matter more.

What changes the price of a metal roof?

• Roof shape: hips, valleys and dormers mean more cutting and trim
• Pitch: standing seam needs a minimum slope set by the panel maker
• Tear-off and decking: old layers off, and the sheathing the panel system calls for
• Gauge, metal and finish: thicker panels, aluminum and premium coatings cost more
• Solar and penetrations: vents, skylights and panels to work around

How long does it last, and is it fire-rated?

InterNACHI estimates metal roofing at 40 to 80 years, versus about 20 to 30 for asphalt shingles (InterNACHI). The state's Safer from Wildfires program lists metal shingles or sheets among the roofs that qualify as Class A.

Does a metal roof in the North Bay have to be a cool roof?

Santa Rosa, Petaluma, Napa and most of the North Bay are in climate zone 2, outside the zones where a home reroof prescriptively needs a cool roof. See the CEC compliance manual.

What matters locally?

Wine country homes often choose metal after a fire scare or an insurance review. Replacing wood shake with a Class A metal assembly addresses both, and stone-coated steel can keep a shake or tile look. On large single-story ranch and country homes, long uninterrupted runs suit standing seam. Rural sites add delivery distance for long panels. In unincorporated Sonoma County, Permit Sonoma requires a Class A roof assembly when more than half of an existing roof is re-roofed, and it treats metal installed per the manufacturer as equivalent.

What should be on a metal-roof bid?

Ask each bidder for the panel system and gauge, the Class A listing for the whole assembly, the underlayment, the paint or coating warranty, and the workmanship warranty in writing. Our quote checker covers the rest. For your actual price, request a free written estimate: a licensed roofer measures the roof and prices your exact scope.

Related: what drives roof replacement cost, roof size estimator, Class A roofs.