Roofing Companies in San Francisco, CA: 2026 Costs & How to Hire
Half the roofs in San Francisco are not really roofs in the suburban sense. Flat and low-slope decks behind parapets, shared party walls, rear light wells and stacked units mean a leak in one place shows up two rooms away, and the fix is a membrane decision rather than a shingle decision. Here is what a reroof costs in the city in 2026, what the permit process actually requires, and how to vet a roofer before water gets into the framing.
By Jason Green · Roofing & Gutters · Published August 26, 2026 · 8 min read
License, permit, insurance - in that order
Roofing in California requires an active CSLB license with a C-39 Roofing classification for anything over $500. Verify the number on the CSLB lookup, confirm it matches the entity on your contract, and require a certificate of insurance sent from the agent showing general liability and workers compensation. Reroofing in San Francisco also requires a permit through the Department of Building Inspection, and a roofer who offers to skip it is telling you the work will not be inspected.
Low-slope decks are a different product than a pitched roof
Most flat and low-slope roofs here are torch-applied modified bitumen, TPO or a fluid-applied system. Ask which system, how many plies, what the manufacturer warranty requires for the install to stay valid, and how the parapet walls, scuppers and drains are being flashed. California Title 24 also sets cool-roof reflectance requirements for many low-slope replacements, so a compliant white or high-reflectance cap sheet may be required rather than optional. Get the assembly named in writing.
Where the money really goes
Tear-off layer count, dry rot in the sheathing, and access drive the final number more than the membrane itself. Older buildings often hide two or three roof layers and soft decking that only appears after tear-off, so a good bid carries a written unit price for sheathing replacement per sheet instead of an open-ended change order. Add gutters, downspout tie-ins, skylight curbs and chimney flashing as their own lines, and expect crane or hoist cost where there is no street frontage.
Deposits, timing and the paperwork that protects you
California limits a residential down payment to $1,000 or 10 percent of the contract, whichever is less. The dry window is roughly May through October, and reputable crews book out; a company promising a start tomorrow in February is usually a company with no backlog. Before final payment, ask for the closed permit, the manufacturer warranty registration in your name, and photos of the deck before the new system went down.
Typical cost ranges
| Roof repair, isolated leak | $650 - $2,600 |
| Low-slope membrane replacement, 1,200 sq ft | $12,000 - $24,000 |
| Composition shingle replacement, 1,500 sq ft | $18,000 - $32,000 |
| Tile or slate replacement, 1,800 sq ft | $30,000 - $70,000 |
| Sheathing replacement, per 4x8 sheet | $95 - $190 |
| Gutter and downspout replacement, typical home | $1,600 - $4,500 |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
How much does a new roof cost in San Francisco?
In 2026 a 1,500 square foot composition roof runs about $18,000 to $32,000, and a 1,200 square foot low-slope membrane runs $12,000 to $24,000. Extra tear-off layers, dry rot and hoisting on a no-frontage lot add to that.
Do I need a permit to reroof in San Francisco?
Yes. Reroofing is permitted through the Department of Building Inspection, and the permit should be pulled by the licensed roofer, not by you. Ask for the permit number before work starts and the closed permit before final payment.
What license should a San Francisco roofer hold?
An active CSLB license with the C-39 Roofing classification for any job over $500. Verify it on the CSLB lookup and confirm workers compensation coverage rather than an exemption if a crew is on your roof.
How long does a roof last here?
Twenty to thirty years for composition on a pitched roof, and roughly fifteen to twenty-five for a well-installed low-slope membrane. Ponding water, failed scuppers and unmaintained parapet flashing are what end most flat roofs early in this city.
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