Which rules does a new roof have to meet in California?

Why a new roof is an alteration, not a repair

The Energy Commission's compliance manual says replacing a component system such as the roof is an alteration and not a repair, and it names replacing an existing wood shake roof with asphalt shingles as an example. Permit applications filed on or after January 1, 2026 fall under the 2025 Energy Code, and earlier ones under the 2022 edition. The 2025 code took effect that day.

What a new roof costs in California

A roof replacement with tear-off is estimated at $7,875 to $23,700 per roof, tear-off included, including a typical permit fee of $328. Eight California roofing companies print a whole-roof range for asphalt-shingle replacement on their own sites, and the band is the middle half of what they print; the national estimate would sit below it, so it serves only as a floor.

So the band is a model and not a quote, and the company figures behind it come from cost-guide pages, not price lists.

Estimated range. Built from national published ranges (2 sources), adjusted by California's roofer wage ratio to the US (1.16, BLS May 2025), plus the local permit fee where the city publishes one. Not a quote. Eight California roofing companies publish a whole-roof range for asphalt-shingle replacement on their own websites (cost-guide pages, not price lists); the roof replacement range is the middle half of what they print. Other company figures (repair starting prices, per-square-foot and tile ranges) are not matched to a job here, so the other ranges rest on the national estimate. Eight California companies publish a price we could count for this job, so the range runs from the lower quarter to the upper quarter of those prices (the middle half of them). Full method. Prices as of Oct 23, 2026.

A repair, or a new roof

The Energy Commission's manual counts replacing part or all of the roof assembly as an alteration. Its cool roof rules begin at 50 percent of the roof area, so ask the company how its proposal measures the area it removes.

Cool roof rules start at half the roof

Replacing 50 percent or more of the roof area triggers the cool roof requirements. On a steep-sloped roof the prescriptive rule is waived with at least R-38 ceiling insulation or an attic radiant barrier meeting section 150.1(c)2. It's also waived with no attic ducts in climate zones 2, 4, 9, 10, 12 and 14, or with R-2 or more insulation above or below the deck. Low-sloped roofs have other routes. They can use the aged solar reflectance and deck insulation values in Table 150.2-E, or the performance approach.

Only the Cool Roof Rating Council decides what qualifies, and an ENERGY STAR listing doesn't, since its reflectance requirements differ and it has no emittance requirement. Ask the company for the CRRC rating of the product it prices.

The fire class your new roof must reach

Class C is the statewide floor. Under Health and Safety Code 13132.7 it applies to a roof replaced over more than 50 percent of its area in one year, to any new covering and to every new structure. In Very High Fire Hazard Severity Zones, state responsibility areas outside the moderate zones and locally designated very high zones, the floor is Class B. Class A applies in Very High zones that CAL FIRE or a local agency designates under 13132.7(d), unless the jurisdiction adopts the State Fire Marshal's model ordinance.

What the contract has to say

B&P 7159.5 requires a written contract that states the agreed amount in dollars and cents, covering profit, labor and materials. The downpayment is capped too. It can't exceed $1,000 or 10 percent of the price, whichever is less, and apart from the downpayment the roofer may not ask for more than the value of the work done or material delivered. After each payment you can ask for an unconditional lien release for the work paid.

Contracting without a license bars the contractor from suing for payment (B&P 7031), and a person who hired an unlicensed contractor can sue to recover everything paid.

Who is on your roof

A C-39 license holder must carry workers' compensation insurance whether or not the company has employees, and the bond on file is $25,000, with the surety's liability to claimants other than workers and suppliers capped at $7,500. Cal/OSHA's order 1731 requires fall protection for roofing employees on a single-family roof at a fall distance of 6 feet or more on slopes up to 7:12, and at any height on steeper ones.

What a replacement-cost policy pays toward a new roof

Under Insurance Code 2051.5, an open replacement-cost policy pays the cost to replace without deduction for depreciation, up to the limit. If the policy requires actual repair, you get actual cash value first and the difference once the work is done. That second payment has a deadline. You have at least 12 months from the first actual-cash-value payment to claim it, or 36 months for a loss tied to a state of emergency.

A replacement-cost policy issued or renewed must also carry code-upgrade coverage of at least 10 percent of the dwelling limit, in addition to the limit. CDI's homeowner guide warns that some policies lack ordinance-or-law coverage.

When a replacement can't wait

What to gather before asking for estimates

1. Write down the roof's area and whether your city is in a mapped fire hazard zone.
2. Run each company's license number through CSLB's lookup.
3. Ask each company for the CRRC rating, the fire class and the permit fee.

Permits for a new roof

Six city fee schedules (Fontana, Chula Vista, Fremont, Escondido, Carlsbad and Ventura) list a permit for re-roofing, and Fremont files the residential reroof under its express permits. Under Health and Safety Code 17958 each city or county may amend the state standards, so ask yours who issues the permit and what it charges.

Before any work starts, ask for the license number and check it with your state's licensing board.

Questions people ask

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• Roof repair
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• Roof inspection

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