Building permits and plan check in Moraga

Contra Costa County handles building permits for the Town of Moraga. Here is what we could verify about Contra Costa County’s permit office, what California law says about plan check, and how to answer a correction letter. Each fact links to its source.

Who handles building permits in Moraga

Building permits for Moraga are handled by Contra Costa County, so plan check corrections and resubmittals go to Contra Costa County. (moraga.ca.us, checked October 31, 2026)

Contra Costa County permit office

• ePermits Center (Accela Citizen Access)
• Building department page

Links and facts checked on October 31, 2026.

See the full Contra Costa County plan check guide

Contacts at the Town of Moraga

• Building department: (925) 655-2700 (moraga.ca.us, checked October 31, 2026)
• Address: 30 Muir Road, Martinez, CA 94553 (moraga.ca.us, checked October 31, 2026)

Links and facts checked on October 28, 2026.

Moraga and Contra Costa County

Moraga is in Contra Costa County. See the Contra Costa County guide.

California rules every plan check here follows

These come from California law and state agencies, so they apply in Moraga as well. Each links to its source.

Building code in force

The 2025 edition of Title 24, the California Building Standards Code, has been in effect since January 1, 2026.

Source: California Building Standards Commission, checked October 31, 2026

Energy code

If your permit application was filed on or after January 1, 2026, the project has to meet the 2025 Energy Code.

Source: California Energy Commission, checked October 31, 2026

Energy forms with the application

A building permit application covered by the energy code (Part 6) must include at least one copy of the required energy compliance documents.

Source: California Energy Commission, 2025 Building Energy Efficiency Standards, checked October 31, 2026

Green building code (CALGreen)

The 2025 edition of CALGreen, the state green building code (Part 11), took effect on January 1, 2026.

Source: California Building Standards Commission, checked October 31, 2026

ADU decision deadline

If the city or county has not approved or denied a complete application for an ADU or junior ADU within 60 days, the application is treated as approved (Gov. Code § 66317).

Source: California Department of Housing and Community Development, ADU Handbook, checked October 31, 2026

ADU denials must explain the fix

When a city or county denies an ADU or junior ADU application, it must send written comments within 60 days that list each problem and explain how you can correct it.

Source: California Department of Housing and Community Development, ADU Handbook, checked October 31, 2026

Building permits for approved housing projects

For housing projects that already have planning approval, the city or county has 15 business days to say whether a building permit application is complete, then 30 or 60 days, depending on how many units are proposed, to decide whether it meets the standards.

Source: California Department of Housing and Community Development, Housing Law Fact Sheets, checked October 31, 2026

What a good response to plan check corrections has

General guidance, not the Town of Moraga’s own rules. Check its page before you resubmit.

• Answer every comment, in the reviewer’s order and numbering, so nothing is missed.
• Say plainly what you changed for each comment, or why no change is needed.
• Name the sheet and detail where each change is, so the reviewer can find it fast.
• Mark changes on the drawings (clouds or deltas are common) and keep sheet numbers the same.
• Send the response letter, the revised drawings and any new calculations together.

Other California city guides

• City of Brentwood
• City of Clayton
• City of Concord
• Contra Costa County
• Town of Danville

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