Permits and roofing rules in Paramount

The statewide layer

The city rules above sit on top of these. Where the two differ, the stricter one governs.

What a wildfire-zone roof actually has to include

Inside a mapped fire hazard zone the requirements go well beyond what the roof is covered with, and the extra details are exactly where a cheap job differs from a compliant one. It is embers rather than a flame front that destroy most houses in a wildfire, and every requirement below closes a gap an ember could use.

• A roof assembly meeting Class A when tested to ASTM E108 or UL 790
• On profiled tile, bird stops at the eaves and hip and ridge caps mudded in, so there is no open end for embers to enter
• Valley flashing of at least 0.019 inch (26 gauge) corrosion-resistant metal, over a mineral-surfaced cap sheet at least 36 inches wide
• Noncombustible gutters and downspouts, with an approved means of stopping leaves and debris collecting in them
• Vent screening of noncombustible corrosion-resistant mesh, no finer than 1/16 inch and no coarser than 1/8 inch

How many layers can stay on

A new covering may not be laid over the old one where there are already two applications of any type on the roof, where the existing roof or covering is water-soaked or has deteriorated enough that it is no longer a sound base, or where the existing covering is slate, clay, cement or asbestos-cement tile. In those cases the roof comes off to the deck.

So two layers is the practical ceiling — and on an older house nobody knows the real number until somebody lifts a corner. It is the commonest reason a re-roof price moves after work starts, which makes it a fair thing to ask a quote to address in advance.

Licensing, deposits and what has to be on the paperwork

Roofing sits under the C-39 classification at the Contractors State License Board. The small-job exemption that permits unlicensed work rose to $1,000 in January 2025, but it does not extend to work needing a permit, and a re-roof needs one. So the rule that matters is the simple one: a re-roof requires a licensed contractor, at any price.

The deposit is capped by statute. A home improvement contractor may not take a down payment of more than $1,000 or ten per cent of the contract, whichever is less, unless they have a blanket performance and payment bond on file with the board. Exceeding it is a misdemeanour, and in a declared disaster area the court is required to impose the maximum fine — which tells you how commonly it is attempted after a storm.

Every licensed contractor is required to put the licence number in all advertising, and in contracts, subcontracts and bids. An advertisement without one is itself a signal. The board's own register will confirm a number in under a minute, and it is worth the minute.

Fire classification: what is actually required, and where

Every ordinary re-roof has to meet at least a Class C fire-retardant covering. That floor applies to new roofs, to repairs and replacements, and to any existing building where over half the roof area is replaced inside a year.

Class A, the highest classification, is required where the property sits inside a fire hazard severity zone or a wildland-urban interface area, and many cities require it more widely by local ordinance. In practice, across most of south Orange County, Class A is the answer — but it comes from the fire zoning and the local ordinance rather than from a blanket statewide rule, so it is worth confirming for your address rather than assuming either way.

As of 1 January 2026 the wildfire rules live in their own book: the California Wildland-Urban Interface Code, Title 24 Part 7, which consolidated what used to be Chapter 7A of the building code and section R337 of the residential code. A contractor still citing Chapter 7A is citing something that has been superseded.

The code your roof will be built to

The rules a California re-roof is built to live in Title 24, the state building standards code. Its 2025 edition governs any project whose permit application went in on or after 1 January 2026. A roof installed before that date was built to an older edition, and not everything acceptable then is acceptable now.

This is practical rather than academic. A contractor quoting from memory instead of from the edition currently in force will occasionally price a detail that will not pass — and the inspection comes at the end of the job, not the beginning.