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sonoma-ca-adu-guidelines

Accessory Dwelling Unit (ADU) City Regulations

Number of ADUs allowed:

Only one accessory dwelling unit shall be allowed per parcel. A primary dwelling must be in existence of the lot for which the accessory unit was proposed at the time the application for a zoning clearance is made. A junior accessory dwelling unit may include a full bathroom, provided that no more than one (1) second accessory dwelling unit may be located on any parcel.

Types of ADUs allowed:

All accessory dwelling units and junior accessory dwelling units.

Lot size:

No minimum lot size is required other than the requirements of the underlying zone.

ADU size:

A detached accessory dwelling unit shall have a floor area not exceeding 850 square feet. Any accessory dwelling unit exceeding 650 square feet in area shall not exceed 50 percent of the existing living area of the primary dwelling. A junior accessory dwelling unit shall not exceed five hundred (500) square feet in floor area.

Setbacks:

The foregoing limitations notwithstanding, setbacks for an accessory dwelling unit converted from a legal. The required minimum side and rear yard setbacks for an accessory dwelling unit constructed above an existing garage shall be five feet (5'). If detached, the accessory dwelling unit shall be separated from the primary dwelling unit a minimum of feet.

Parking:

A parking space is not required for the junior accessory dwelling unit. Required Parking: One (1) off-street parking space with an all- weather surface shall be provided for the exclusive use of the accessory dwelling unit. The parking space for the accessory dwelling unit may be allowed in the driveway and in tandem. The parcel containing the accessory dwelling unit is within 1/2 mile of a public transit stop: or' If a garage or carport that provides required parking space(s) for the primary unit is demolished in conjunction with construction of an accessory dwelling unit.

Fire Safety:

[State Standard] accessory dwelling units shall not be required to provide fire sprinklers if they are not required for the primary dwelling.

Shape, materials and style:

The accessory dwelling unit shall be similar or compatible in the character of the primary dwelling on the site in terms design and landscaping.

Height:

Detached accessory dwelling units shall be limited to a single story and shall comply with height restrictions for accessory structures. Attached accessory dwelling units shall comply with height restrictions for primary structures.

Design review:

The required zoning and building permits for a junior accessory dwelling unit shall be approved or denied within 120 days from submittal of an application that includes all materials required to process the permits. A junior accessory dwelling unit shall be installed within a legally established bedroom within the existing walls of a fully permitted single-family dwelling. A junior accessory dwelling unit shall contain an efficiency kitchen.

Number of Bedrooms:

A junior accessory dwelling unit shall be installed within a legally established bedroom within the existing walls of a fully permitted single-family dwelling.

Ownership:

The applicant shall be the owner of the property and shall reside on the property in either the main or ADU (upon construction). An accessory dwelling unit may be rented for periods of 30 days or more. The rental of an accessory unit for periods of less than 30 days shall be prohibited. A junior accessory dwelling unit may include a full bathroom.

Utility connections:

Local health officer approval where a private sewage disposal system is being used, if required. (State requirements)

Entry:

A separate entrance to the junior accessory dwelling unit shall be provided.

For more ADU Information

https://sonomacounty.ca.gov/PRMD/Regulations/Accessory-Units-and-Junior-Units/

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