Accessory Dwelling Units are also known as a mother-in-law suites, carriage houses, garage apartments. These are defined as "a second dwelling either within or added to an existing single-family home, or in a separate accessory structure on the same property as the main home, for use as a complete, independent living facility..." Even if access between the main dwelling is provided, any space in a structure with a separate cooking area, separate bathroom, and separate exterior entrance is considered an ADU.
General requirements for ADUs
- Allowed as an accessory use to a single-family detached home
- Permitted in residential or mixed-use zoning districts (check the City's Zoning Map to verify zoning for a specific property)
- The ADU must be subordinate in size to the main home (50% of the finished floor area of the principal dwelling, or less)
- One additional off-street parking space needs to be provided for the ADU
- The property owner must occupy either the principal or accessory dwelling unit and they cannot be leased or rented for tenancies of less than 30 days.
- Mobile homes, recreational vehicles (RVs), tiny homes built on trailers, and travel trailers cannot be used as ADUs.
- The Site Plan Waiver process is typically used to review and approve requests for ADUs
- Building permits are required to construct ADUs
- Fees for ADUs vary depending on the specific project and will be calculated with the building permit. Fees typically range from $6,000 - $10,000 and include plan review and permit fees, City and County taxes, and a number of community investment fees.
The complete, specific development standards are outlined in the Municipal Code's §15.04.040
Last modified: 10/15/2018, I. Colby