The Cool Roof Rules Changed in January. Here Is What That Means for Your Roof

If you are planning a re-roof this year, there is a change worth knowing about before you start choosing colors. California's 2025 Building Energy Efficiency Standards, the part of Title 24 that governs how buildings use energy, took effect on 1 January 2026. Roofing is one of the areas it touches directly.

This is not a small print change. For many homes in our service area it affects which products are on the table at all.

What a "cool roof" actually means

The term sounds like marketing. It is not. It refers to two measurable properties of a roofing surface:

• Solar reflectance. How much of the sun's energy the surface bounces back instead of absorbing. Measured from 0 to 1.
• Thermal emittance. How readily the surface releases the heat it does absorb.

Those two are combined into a single number, the Solar Reflectance Index, or SRI. Roofing products are tested and rated, and the ratings are published. The number that matters for compliance is usually the aged reflectance, measured after three years of weathering, not the value on day one. Every roof gets dirtier and darker with time, and the standard accounts for that.

Why the Valley is affected more than the coast

California is divided into climate zones for energy code purposes, and the requirements are not the same everywhere. The hotter inland zones carry the stricter roofing requirements, which is exactly where most of our work is.

A house in Woodland Hills or Northridge sits in a hotter zone than a house near the water. Push further out to Palmdale or Lancaster and the climate picture changes again. The practical result is that inland homes with steep slope roofs face real limits on dark, standard shingles.

The part that surprises homeowners

Standard dark asphalt shingles generally do not meet the reflectance targets in the hotter zones. That is the honest summary. It does not mean you must have a white roof. It means one of the following has to happen:

• Use a cool rated shingle. The major manufacturers make them. They are engineered with reflective granules and are rated and listed for compliance.
• Take a trade off path. The energy code allows alternatives, such as added insulation or other measures, that let a project comply overall rather than line by line.

The second route is real and sometimes the right answer, particularly on a house that is being worked on more broadly. It is also more paperwork. Most straightforward re-roofs go the first route.

Cool rated does not mean white

This is the single most common worry we hear, and it is out of date. Cool rated lines now come in the deep greys, browns and weathered wood tones that people actually want. The reflective performance comes from the granule technology, not from making the shingle pale.

Owens Corning, whose products we install, produces cool rated options within its architectural shingle range. You can see how color choices sit against a real roof on our shingle styles and colors page, and the Design EyeQ tool lets you preview combinations before committing.

What this means if you are getting quotes

Ask any contractor you are speaking to how the roof they are proposing complies. It is a fair question and a good filter. A contractor who works in this area regularly will answer it without hesitation and will know which products are listed.

Be wary of a quote that is noticeably cheaper than the others and specifies a standard dark shingle for an inland home. That price gap may be the compliance question going unanswered. It tends to resurface at inspection, and by then the shingles are on the roof.

A note on honesty

Requirements depend on your climate zone, your roof slope, the size of the job and whether the work counts as a re-roof or a repair. Cities sometimes layer their own requirements on top. We will tell you exactly what applies to your address, and your local building department is the final word.

If you are weighing up a re-roof this year and want a straight answer about what your house needs, ask us for a quote and we will walk the roof and tell you.