Accessory dwelling unit permit cost — San Diego, CA
Last updated: September 24, 2026
What affects the price
Building an ADU involves several moving parts that shape your total investment. The final figure depends heavily on whether you choose a prefab unit or a custom build from the ground up. Site conditions are another major factor; if your property requires extensive grading, utility trenching, or foundation work, costs will climb. You also have to consider your choice of finishes, like high-end appliances or custom cabinetry. Navigating local permit fees and impact assessments also adds to the total.
Frequently asked in San Diego
What are the disadvantages of ADUs in San Diego?
Potential downsides in San Diego can include the initial construction investment and navigating the city's permitting process, which can be intricate. Neighbor concerns about parking or privacy are also considerations. Understanding local zoning is key before proceeding.
How much does an ADU permit cost in San Diego?
What are the rules for ADUs in San Diego?
Is an ADU allowed in San Diego?
California has had grant programs aimed at reducing ADU development costs, sometimes reaching tens of thousands of dollars. These programs often have specific eligibility criteria and target certain types of ADUs or homeowners. Inquiring about current state or local initiatives is wise.
What's involved in building an ADU in San Diego?
Also serving nearby: El Cajon · Chula Vista · San Marcos · Escondido · Carlsbad
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, Pacific Beach, North Park, Point Loma — and every surrounding area.
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