Allowable ADU Size and Special Districts

APN Number is used to find the Allowable Adu Gross floor area for your Property

* Information in this tool is based on the County’s Geographic Information Systems data. Allowable ADU size is maximum based on the County Code (gross site area) and does not take into account size and footprint of existing structures, or any other physical constraints of your parcel that can affect the allowable size of new structures (net site area). For properties encumbered by rights-of-way or coastal bluffs and beaches, please consult with Planning Department staff to determine maximum allwable ADU size. This tool does not replace or supersede confirmation of your development envelope with the County Planning Department.