Affordable accessory dwelling unit

Looking for affordable accessory dwelling unit in San Francisco, CA? Call AccessoryDwellingUnit Solutions for a contact a provider — no obligation. Licensed adu builders serve San Francisco and the surrounding area, and you'll get straight answers on timing and what affects the price.

Last updated: September 24, 2026

What affects the price

Building an ADU involves several moving parts that shape your total budget. The biggest factor is whether you choose a prefabricated unit or a custom build on-site. Site preparation is also significant; if your land requires extensive grading, utility trenching, or foundation work, costs will climb. Your choice of finishes—like kitchen cabinetry, flooring, and siding materials—also shifts the bottom line. We help you navigate these variables to find a setup that fits your property. Exact pricing confirmed free on the call.

About this service

Building an affordable unit often comes down to choosing efficient designs and pre-planned layouts rather than full custom builds. By simplifying utility connections and minimizing complex excavation, you can keep your project within a reasonable budget. While we aim to make the process accessible, the final bill depends on your specific site conditions. Exact pricing confirmed free on the call.

Frequently asked in San Francisco

What are the disadvantages of ADUs in San Francisco?

How much does an ADU cost in California?

What are the rules for ADUs in California?

California has statewide laws encouraging ADUs, but San Francisco has specific local ordinances that must be followed. These rules often govern height, setbacks, parking requirements, and lot coverage. Ensuring compliance with both state and city regulations is vital. We can help you get started.

Is ADU allowed in Maryland?

Our services are concentrated in California cities like San Francisco. ADU regulations vary significantly by state and even by local jurisdiction. For information on ADU allowances in Maryland, you'll need to consult Maryland's state and local planning authorities. We can assist with your San Francisco ADU needs.

What are the rules for ADU in California?

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

808,988residents

17,323per sq mile

8ZIP codes served

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: The Richmond, The Sunset, Mission District, Nob Hill, Haight-Ashbury, Marina District — and every surrounding area.