City-specific permit, cost, and rental income guidance for building an ADU in Orange County, California.
Yes, you can build an ADU on most residential lots in Irvine — California law limits many local and HOA restrictions. A typical…
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Yes, Anaheim allows ADUs on qualifying residential lots and processes a high volume of ADU permits every year. A detached ADU typically…
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Yes, Santa Ana homeowners can build an ADU, and the city has one of Orange County's stronger ADU adoption patterns due to strong local…
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Yes, Huntington Beach must allow ADUs under California state law, and the city now follows standard state ADU rules after previously…
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Yes, Newport Beach must allow conforming ADUs under state law, though many properties sit within the California Coastal Zone and may need a…
Read the Newport Beach ADU Guide →For county-wide rules, city-by-city highlights, and OC-specific incentive programs, start with our Orange County ADU Guide (2026). Ready to move forward? Get matched with a vetted OC contractor or download our free ADU eBook.