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Accessory Units & Junior Units

Accessory units are an inexpensive way to create smaller, more affordable rental housing units for Sonoma County residents.

Accessory Dwelling Unit

Accessory Dwelling Units (ADUs) are backyard cottages of between 250 and 1,000 square feet.

An accessory dwelling unit is a small permanent home that may be established in addition to the main dwelling on a parcel zoned for residential use. Accessory dwelling units may be attached or detached from the main dwelling.

Most residential zoning districts allow one accessory unit unless there is a "Z" (Accessory Unit Exclusion) overlay zoning on the property.

Can be rented for long-term occupancy, but cannot be used as a vacation rental.

Read More about Accessory Dwelling Units

Junior Accessory Dwelling Unit

Junior Accessory Dwelling Units (JADUs) are a very small living unit (up to 500 square feet) created out of a bedroom within an existing single family home.

It’s created by adding an efficiency kitchen (see "Efficiency kitchen" Sec. 26-02-140) and exterior door to an existing, legal bedroom. It may include a bathroom or may share a bathroom with the house.

Junior Units are allowed in every zoning district that allows a single-family dwelling.

Can be rented for long-term occupancy, but cannot be used as a vacation rental.

Read More about Junior Dwelling Units

Contact Information

Contact Us by Phone
2550 Ventura Avenue
Santa Rosa, CA 95403
38.46514, -122.723671

Housing for All Strategy

Learn More

multi-unit housing

The County's strategic priority to ensure housing for all income levels.

Find My Property's Zoning

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Zoning Map

Instructions for finding your zoning by address or parcel number.


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