TOPIC
Accessory Dwelling Unit (ADU)
Add accessory dwelling units (ADUs), in-law units, or cottages to residential properties.
Services
Apply for an ADU
Check if you can add new Accessory Dwelling Units to your residential property
You may be able to add additional accessory dwelling units (ADUs), also known as granny flats, in-law units, cottages, or garage apartments to your existing or proposed building.
Get a building permit for an Accessory Dwelling Unit (ADU)
A building permit is required to do construction in San Francisco. Follow these steps to obtain a building permit for an ADU.
ADU requirements
Design an ADU that meets City codes
Accessory dwelling units (ADU) must meet City requirements that keep buildings safe and neighborhoods livable.
Add ADU details to your plan set
You must add details like street tree location to your plan sets for ADUs. See the complete list.
Check our street tree rules for your ADU
Your property must have one street tree per every 20 feet of frontage that borders the public right of way.
Post a notice for your ADU
For Local program ADUs, you must post a notice in your building at least 15 days before your submit your ADU application.
Pre-approved Accessory Dwelling Unit Plans
Resources
Learn about the Permit Review Roundtable
Building permit applications for Accessory Dwelling Units (ADU) being proposed under the State Program can be reviewed in advance by all relevant City departments and discussed with the design professional during a virtual meeting with plan checkers from those departments.
ADU Design and Permitting Resource Sheet
Accessory Dwelling Unit (ADU) Design & Permitting Resource Sheet - a general guide for obtaining a permit to construct an ADU