What a Roof Costs in San Jose: 2026 Homeowner Guide

• Roof leak repair: $300–$1,500 in published California figures; the national typical band is $400–$1,900, average around $1,150.
• Flat and low-slope repair: $750–$3,500, with Bay Area work at the upper end.
• Roof inspection: $150–$600 locally, where you want one bought separately rather than folded into a sales visit.

Access, pitch, layer count and the state of the deck underneath are what move a repair inside that band — and the last one is unknown until the covering comes off, which is why honest repair quotes carry a contingency for decking.

• Asphalt shingle: about $5–$8 per square foot installed in this region.
• A typical 2,400-square-foot San José roof: $14,800–$20,000 for asphalt shingle.
• Smaller roofs: $5,200–$8,200 for around 1,000 square feet, $7,900–$12,400 for 1,500.
• The citywide published range: $5,200–$32,900, the top end being large roofs and premium materials.

Published per-job quotes and published per-foot rates do not always agree — one local source puts a twenty-square job at $19,500–$24,000 plus permit fees, which is well above the same job priced at $5–$8 a foot. Both are real numbers from this market; the difference is material grade, tear-off count, structural work and who is quoting. Treat any single number you are given as one sample, and ask what it assumes.

Layers. Tearing off two existing layers is a different job from one, in labour and in disposal.

Pitch and access. Steep roofs need staging and slow everyone down. So does a house you cannot get a truck near.

Decking. Soft or rotten sheathing found during tear-off is extra, always. A quote with a per-sheet price for replacement decking written into it is a quote from someone who has done this before.

Penetrations and detail. Skylights, chimneys, dormers, valleys — every one is flashing work, and flashing is where roofs fail.

Material. Asphalt architectural shingle is the default here. Concrete tile, standing-seam metal and shake alternatives multiply it.

Ventilation and insulation work, which the energy code may pull into the job.

This is the part that surprises people. California's energy standards treat a large enough reroof as new construction of the roof:

• Replace or recover more than 50% of the roof area — or more than 2,000 square feet, whichever is less — in a rolling twelve-month period, and the entire roof must meet current requirements.
• That means cool-roof reflectivity standards for the assembly, and in a mapped fire hazard severity zone, Class A fire-rated construction with ember-resistant attic venting.
• Repairs accumulate. Two large repairs in the same twelve months can cross the line between them, and the requirement applies to the whole structure rather than the second patch.
• Below the threshold, only the repaired area needs to match compliant materials.

The practical consequence: past a certain size, "just repair it" stops being cheaper per square foot, because the second half of the roof arrives with the code attached. Ask any bidder to tell you, in writing, which side of that line their scope sits on.

San José requires a permit for reroofing in most cases, with a final inspection by the city once the work is complete. Permit fees are itemised on a contract and published guidance describes them as running from a few hundred dollars up, depending on the value of the job.

The contractor pulls the permit, and their licence number goes on the application. Being asked to pull the permit yourself is not a cost-saving suggestion; it moves the liability to you and often means the person asking cannot pull it. Unpermitted roof work resurfaces twice: when a carrier examines a claim, and when a buyer's inspector finds a roof with no paperwork behind it.

If your address is in one of the unincorporated county pockets that carry San José mail, the permit is the County of Santa Clara's — the service-area page lists them.

Seamless aluminium $8–$15 per linear foot installed, downspouts $30–$75 each, a typical set $220–$625, and underground discharge lines $150–$350 per downspout. Bundled into a reroof they are usually cheaper than done alone.

Sudden damage — wind, a fallen limb, storm — is often a claim. Age, wear and deferred maintenance never are, whatever anyone knocking on the door after a storm says. Photograph the damage before anyone touches it, from the ground; carriers ask for exactly that, and a repair made first is a repair that complicates the claim.

Which side of the 50% threshold does this scope sit on, in writing? What happens if the decking is bad, and at what price per sheet? Is all the flashing being replaced, or reused? What is the ventilation plan, and does the energy code require anything new? Who pulls the permit, and when is the inspection? And what does the workmanship warranty cover as distinct from the manufacturer's — the second one is on the material, and only the first one is on the person who installed it.