You pull a permit for a new house in one city and the plans sail through. The same design across the city line comes back asking for a heat pump water heater and more solar than the state requires. Nobody moved the state energy code — one of those cities adopted its own, stricter version.
Cities are allowed to do that, and the process has real gates. A local government may adopt and enforce its own energy standards for new buildings, additions, alterations and repairs — but only after it adopts a cost-effectiveness determination at a public meeting, files it with the Energy Commission, and the Commission finds the standards will make buildings consume less energy than the state code permits (§ 10-106).
Key requirements
| The gate | What it takes | Where it comes from |
|---|---|---|
| Cost effectiveness | Determination adopted at a public meeting, then filed with the Energy Commission | § 10-106(a) |
| Energy performance | Commission finds buildings will use less energy than the state code permits | § 10-106(a) |
| Application | Proposed standards, findings, analyses and environmental documents | § 10-106(b) |
| Second approval | Ordinance filed and accepted by the Building Standards Commission | § A4.201.1 |
| Timing | Both approvals come before enforcement | § 10-106(a), § A4.201.1 |
A reach code is stricter, never looser
The direction is fixed. The Energy Commission has to find that the local standards "will require buildings to be designed to consume less energy than permitted" by the state energy code:
The Energy Commission finds that the standards will require buildings to be designed to consume less energy than permitted by Title 24, Part 6.
A city cannot use this process to let builders do less. The state code is a floor, and the only local variation this section authorizes is upward. That is why these local ordinances are commonly called reach codes — they reach beyond the state minimum.
What the city has to file
The application goes to the Energy Commission's Executive Director, and the contents are specified (§ 10-106(b)):
- The proposed energy standards themselves.
- The local agency's findings and supporting analyses on the energy savings and cost effectiveness of those standards.
- A statement or finding that the proposed standards will require buildings to be designed to consume less energy than the state code permits.
- Any environmental documents required under the California Environmental Quality Act — including a negative declaration or environmental impact report, where one is required.
The cost-effectiveness analysis is the substantive hurdle. A city cannot simply decide it prefers stricter rules; it has to show the work, in public, before filing.
There are two approvals, not one
This is the part that trips people up, and it is spelled out in the green building code's discussion of local energy provisions (§ A4.201.1).
A local jurisdiction adopting stricter energy provisions as mandatory has to:
- Submit the application and receive the Energy Commission's approval, per the section above; and then
- Once the filing has been verified and the Commission's finding made, file an ordinance expressly marking the local modification, along with findings, and receive acceptance from the California Building Standards Commission.
Both happen before enforcement. So a reach code that has been voted on by a city council is not necessarily in effect — it may still be waiting on one of two state approvals. If you are told a local energy requirement applies to your project, it is fair to ask whether that ordinance has completed both steps.
The same section is a useful reminder of the baseline: the Energy Commission continues to adopt the mandatory statewide standards, and the green code's own energy provisions are voluntary unless a jurisdiction codifies them through exactly this process.
What the state code already covers
Knowing what the state energy code reaches tells you what a reach code is reaching past. It applies to buildings in Occupancy Groups A, B, E, F, H, I, L, M, R, S and U, where a permit application is filed on or after the provisions' effective date, and which are unconditioned, directly or indirectly conditioned, or process spaces (§ 100.0(a)).
Within those buildings it governs the building envelope, space-conditioning systems, water-heating systems, pools and spas, solar-ready requirements, indoor and outdoor lighting systems, and electrical power distribution (§ 100.0(b)).
Three exceptions are worth knowing. Qualified historic buildings regulated by the state's historical building code are excepted, with lighting handled separately. Temporary buildings, temporary outdoor lighting and structures erected in response to a natural disaster may be excused at the building department's discretion, provided they are removed when the permit expires. And buildings in Occupancy Groups I-3 and I-4 are excepted.
What this means for your project
Practically, three things follow.
Check the jurisdiction, not the state. Two neighboring cities can have genuinely different energy requirements for identical buildings, and both can be lawful.
A local requirement should be traceable. A reach code exists as an ordinance, backed by a cost-effectiveness study, an Energy Commission finding and a Building Standards Commission acceptance. Those are public documents.
The direction is always stricter. If a local rule appears to permit less than the state code, that is not a reach code, and something is wrong with the advice.
What this page does not cover
The sections above are the process for adopting local energy standards, not the standards themselves. Nothing here tells you what any particular city requires — that is in its own ordinance.
Two further limits. The cost-effectiveness methodology the Energy Commission uses to evaluate an application is not set out in this section. And this process is specific to energy standards; a city adopting stricter local amendments to other parts of the building code follows a different route.
