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
A contractor oversees the daily building process, ensuring the foundation, framing, and finishes meet safety standards. You need one when you are ready to break ground and want a single point of contact to supervise tradespeople like electricians and plumbers. They act as the primary manager for your project, ensuring the work stays on track and adheres to the approved blueprints throughout the entire construction phase.
Frequently asked in San Francisco
What are the disadvantages of ADUs?
While ADUs offer significant benefits, potential disadvantages include the initial construction costs and any impact on existing yard space. You may also experience increased utility costs for your property. Discussing these factors with a local specialist in San Francisco is vital for a clear understanding of the implications.
How much does an ADU cost in Massachusetts?
This service is focused on California. For ADU cost inquiries in Massachusetts, you'll need to find a service provider operating within that state. Our expertise is in connecting San Francisco homeowners with local ADU professionals. We can provide estimates relevant to building in the San Francisco area.
What are the rules for ADUs in California?
California has state laws that generally streamline ADU development, limiting local jurisdictions' ability to prohibit them. These laws often address minimum sizes, owner-occupancy, and parking requirements. However, San Francisco may have specific local ordinances, such as design review or impact fees, that a local expert can clarify for your project.
Is ADU allowed in Maryland?
What are the rules for ADU in California?
California's ADU laws aim to make building them more accessible, often overriding local restrictions on size and density. Key provisions include reduced impact fees and streamlined permitting. San Francisco may have its own specific design guidelines or historical review processes that a local professional can navigate for you. Understanding these local nuances is critical.
California has implemented grant programs designed to offset ADU construction costs, though availability and specific terms can vary. These initiatives often target homeowners looking to create affordable housing options. A qualified professional in San Francisco can inform you about any current grant opportunities relevant to your project and assist with the application process.
Also serving nearby: Daly City · Richmond · San Mateo · Berkeley · Oakland
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: The Mission, North Beach, Pacific Heights, Richmond District, Sunset District — and every surrounding area.
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