Am I allowed to build an ADU?

In almost all cases, yes! ADUs and JADUs are allowed in any single-family or multi-family zone. If residential buildings are allowed, ADUs are almost always allowed too (with limited exceptions for safety, traffic, and water).

State law now allows a single-family property to have a JADU, an internal conversion or attached ADU, and a detached ADU. Some places allow for more. Multifamily properties ­– like duplexes, triplexes, and apartment buildings – can have two detached ADUs or up to 25 percent of the number of units, depending on your property. Talk to local staff for more information if interested in building ADUs on a multifamily property. Developers building new homes or multi-family housing can include ADUs at the same time, but should confirm with local staff beforehand.