Accessory dwelling unit permit cost — San Diego, CA

Last updated: September 24, 2026

What affects the price

Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.

About this service

Permit fees are paid to your local municipality and fluctuate based on the specific city or county where your property is located. These costs cover plan reviews, impact fees, and safety inspections required to make your new space legal and compliant. Because every jurisdiction has a different fee structure, the final amount depends on your specific town’s regulations. We help you estimate these during the planning phase. Exact pricing confirmed free on the call.

Frequently asked in San Diego

Also serving nearby: El Cajon · Chula Vista · San Marcos · Escondido · Carlsbad

All cities in California →

More on this: HUD ADU resources — ADU policy and financing research.

Service area details

Serving all of San Diego — population 1,388,320; about 4,257 residents per square mile across 326.1 sq mi. ZIP codes covered include 92101, 92102, 92103, 92104, 92105, 92106, 92107, 92108.

Neighborhoods served in San Diego: La Jolla, Coronado, Point Loma, North Park, Hillcrest, Gaslamp Quarter — and every surrounding area.