Cool roof rules come up fast once a Los Angeles reroof gets close to the permit stage. Most owners and property managers hear the term long before they learn which rules apply. The answer depends on your building type, your existing roof, and the size of the project.
This article explains what to check and where the current answers are published. We keep the focus on property inside the City of Los Angeles, since nearby cities set their own rules. Nothing here takes the place of a plan check or a permit decision made by the City.
Which rules and application date apply?
Two current sources carry most of the weight: the state Energy Code and the City green building rules.
Cool roof language changes over time, so the date you check matters as much as the rule. Read the current version of any code page or bulletin before you plan around it. A summary written a few years back may no longer match the text in force today.
File names can mislead you, since a revised bulletin may still carry an older year. Check the revision date printed on the file itself, then work from that version.
Current state energy code
State rules come from the 2025 Energy Code, kept current by the California Energy Commission.
The commission posts the current 2025 Energy Code resources for owners, designers, and builders. Homes and other buildings follow separate paths, so start with the route that matches yours.
Current local requirements
In the City of Los Angeles, roof replacements of any value fall under the Green Building Code.
LADBS applies that to roof replacements of any value, for homes and other buildings alike. Its green building and sustainability page describes cool roof products and the ways to check them. Those resources include the Cool Roof Rating Council plus City ordinance and FAQ pages.
Roof type and project scope
What applies to your project depends on the building type, the roof slope, and the amount replaced.
Scope causes most of the confusion, since a small repair and a full tear-off differ. The City express permit bulletin lists certain reroof scopes and ties conditions to each item. Read those conditions closely before anyone assumes the simplest path is open.
Those items cover reroof coverings over existing or new sheathing, with weight and fire limits. That listing does not mean every reroof scope qualifies for express work in the City. Compare the current bulletin against your own scope, not a summary from someone else.
Slope matters too, since low areas raise drainage and detail questions that steeper roofs avoid. When a building has flat sections, a close look at the low-slope roof surface shapes the plan. The existing roof, its slope, and its layers set what the new work must include.
| Project scope | What the current source says | Where to confirm |
|---|---|---|
| Residential reroof replacing more than half the total roof area | The listed provisions apply CRRC-labeled cool roof products | Current City express permit bulletin |
| Removing tiles, applying new underlayment, and resetting the same tiles | This listed scope states that cool roof compliance is not required | Current City express permit bulletin |
| Nonresidential reroof work | The same listed items direct readers to separate Energy Code requirements | Current nonresidential Energy Code route |
| Any roof replacement in the City, at any value | Subject to the applicable residential or nonresidential green code provisions | LADBS green building and sustainability page |
Product documentation
The main question is simple: can you show that your exact product has a current rating?
Cool roof products reflect sunlight and absorb less heat than standard roof coverings do. They come in many colors and roof styles, so white is not the only choice. Color by itself does not settle whether a given product meets the rule for your project.
The Cool Roof Rating Council keeps a rated roof products directory that anyone can search. Match the exact product, model, and color, rather than a whole material group. A listing there is not a permit, a roof inspection, or a promise about the work.
Ask for the product data before the order goes in, not after the roof is finished. Changes made during the work can leave your project file out of step with the finished roof.
Condition notes belong in their own record, apart from product sheets and permit papers. If you want those notes in writing, a written roof inspection report is a separate request. A free estimate is not the same thing as a detailed inspection or a written report.
Commercial condition before reroofing
On commercial buildings, what sits under the covering often decides how far the work goes.
Coverings, underlayment, decking, and flashing each play a distinct role in the roof assembly. A new rated covering cannot fix soft decking or a flashing detail that already failed. Those findings change the scope of the work and sometimes the permit path as well.
Rooftop units, drains, and curbs create detail work that no product listing will cover. A commercial roof inspection during planning shows what the old assembly is doing. That record lets the design team plan around real conditions instead of guesses.
The half-roof rule for homes does not carry over to commercial work. Nonresidential projects take a separate Energy Code route, so settle that path early.
Plan the work around what the roof shows, not around the product choice alone. Drains and low spots are one example. They can hold water long after a new covering goes on.
Permit and design decisions
A private inspection reports on the roof, while only the City can issue the permit.
Keeping those two roles apart saves time and heads off delays later on. We can describe what we see on a roof and what the current sources say. The City decides whether your plans and products meet its own rules.
Design choices get easier once the basic facts of the job are written down. List the scope, the roof type, and the products in play before the permit talk. Then check that list against the current rules posted for your building type.
When the job includes low-slope areas, a flat roof inspection backs up those design choices. Bring product data and condition notes, since broad summaries rarely answer job questions.
We do not promise that the City will approve any product or plan. Rules change over time, so the current City and state pages stay the ones that count.