Do You Provide Reports for Every California Climate Zone?
Yes — all 16. Your climate zone is set by the project location, and it materially changes what the Energy Code asks of your building.
The California Energy Code divides the state into 16 building climate zones. They are not political boundaries; they group areas with similar heating and cooling demands so that requirements can be tuned to local conditions. A house in a coastal zone and an identical house in the inland desert face genuinely different requirements.
How your zone is determined
Zone assignment follows the project's location. The California Energy Commission publishes both a lookup tool and a ZIP-code list. Where a single ZIP code spans more than one climate region, the local jurisdiction may designate which zone applies — so the building department is the tiebreaker.
Why it changes your report
Envelope and fenestration requirements vary by zone, and under the performance approach the energy budget your design is measured against is itself zone-specific. The same window package can comply in one zone and fail in another. This is why a report cannot simply be copied from a previous project in a different city.
What we need from you
The project address. That is genuinely all — we determine the climate zone from it, so you do not need to look it up or know your zone number before ordering.
We prepare reports for projects anywhere in California, in all 16 zones.
Frequently Asked Questions
You do not need to. Give us the project address and we determine it. The California Energy Commission also publishes a public lookup tool and a ZIP-code list if you want to check.
Yes. Where a ZIP code spans more than one climate region, the local jurisdiction may designate which zone applies to your project.
Yes. Envelope and fenestration requirements vary by zone, and under the performance approach the energy budget itself is zone-specific.