home additions in San Francisco
Best home additions contractors in San Francisco
An addition is a small construction project: design, permits, foundation, framing, and finish. The contractor who manages all of it on a written schedule is the one worth hiring. San Francisco's old housing stock and high standards reward documented, verifiable work, and pricing runs at the top of the state.
Verified pros in San Francisco
Be the first verified home additions pro in San Francisco
Quotrr is rolling out across California. As general contractors verify completed work in San Francisco, they appear here ranked by Quotrr Score, recent verified work, and distance. Claim this page by listing your business free.
What general contractors in San Francisco quote
- Room and second-story additions
- Accessory dwelling units (ADUs)
- Garage conversions
- Foundation and framing
- Permit and design management
Home additions prices in San Francisco
Room additions typically runs $48,000 to $144,000. Garage conversions typically runs $30,000 to $90,000. Detached ADUs typically runs $144,000 to $420,000.
Bay Area labor and permit costs run roughly 15 to 25 percent above the California average, so budget toward the high end of each range. These are typical ranges, not quotes. Get a line-item proposal from a San Francisco pro to price your job.
What a verified outcome looks like
Examples of the kind of record Quotrr keeps on a completed home additions job. Each is tied to a real job and cannot be edited or deleted after the homeowner posts it.
A garage-to-living conversion permitted and finished on the quoted schedule, each inspection logged against the job record.
A detached ADU delivered at the signed price with foundation, framing, and finish milestones documented on the verified outcome.
Home additions in San Francisco: common questions
How much does a home addition cost in San Francisco?
A room addition in San Francisco typically runs in the five to six figures, while a detached ADU reaches the mid six figures. Foundation work, finishes, and the San Francisco permit path drive the number. See the ranges above.
How long does an addition take to build in San Francisco?
Most additions run 3 to 8 months from permit to final, longer for an ADU. Design and the San Francisco permit review often take as long as the build itself, so plan for both.
Can I build an ADU in San Francisco?
California law makes ADUs easier to permit statewide, and San Francisco follows the state framework with local rules on size and setbacks. A general contractor who builds ADUs locally knows the current San Francisco requirements.
How do I choose a general contractor in San Francisco?
Look for finished projects of similar scope and a verifiable record. On Quotrr a San Francisco contractor's completed builds carry verified Props tied to the real job, with the schedule and price on record.