Accessory dwelling unit contractor san diego — San Francisco, 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.

About this service

Building in San Diego requires specific expertise regarding coastal commission rules, fire safety standards, and local density bonuses. A contractor familiar with this area knows how to navigate the city’s unique permitting process to avoid common pitfalls. You need this service if you own property in San Diego and are ready to add a unit that complies with all regional housing ordinances and structural requirements.

Frequently asked in San Francisco

Also serving nearby: Daly City · Richmond · San Mateo · Berkeley · Oakland

All cities in California →

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

Service area details

Serving all of San Francisco — population 808,988; about 17,323 residents per square mile across 46.7 sq mi. ZIP codes covered include 94102, 94103, 94104, 94105, 94107, 94108, 94109, 94110.

Neighborhoods served in San Francisco: Sunset District, Richmond District, Mission District, Nob Hill, Pacific Heights, Haight-Ashbury — and every surrounding area.