An Accessory Dwelling Unit (ADU) can be built on most residential properties. In addition to one single-family residence, any single-family zoned property that is less than 5 acres may also have a combination of any two of the following: ADU, Junior Accessory Dwelling Unit (JADU), or Guest House. (e.g. 1 ADU & 1 JADU; 1 ADU & 1 guest house; or 2 ADUs) Properties 5 acres or more may also have a combination of any three. Note, JADUs are limited to one per property. However, depending on access to sewer or septic capacity, it may only be possible to have a ADU or JADU created from a conversion of existing space. Please contact Environmental Health Services for questions related to septic system requirements for a residence.