Tiny House as ADU

Sonoma (County), California


Name Tiny House as ADU
Municipality Sonoma (County)
Zoning Districts Generally, zones that permit Residential Uses
Effective Date 04/15/2023
Municipal Code Chapter 7 of the Sonoma County Municipal Code
Code Link https://library.municode.com/CA/Sonoma_County/codes/code_of_ordinances?nodeId=CH7BURE_ARTIIRURE
Authority Permit Sonoma


From Facebook: On March 14th 2023 the Sonoma County Board of Supervisors passed new zoning code that allows each county property, that doesn’t already have an ADU, to add a mobile unit to their property.
Under the new code, the property owner will need to provide water, electric and septic connections and a space for the unit.
The unit can be a Tiny House, Park Model, RV, Mobile Home or a Manufactured Home.
The permit is good for one year – but it is renewable yearly.
Under the new code Tiny House owners can rent a space and utilities from property owners who have installed the proper infrastructure and obtained a permit.
Alternately, property owners can provide a Tiny House or other mobile unit for renters. This new option is way more affordable than building a traditional ADU so hopefully more property owners will exercise this new option. The new code goes into effect on April 15, 2023.

Key Contacts

Permit Sonoma


Phone: (707) 565-1900

Permit Center & Mailing Address
2550 Ventura Avenue
Santa RosaCA 95403


Sonoma County Tiny Houses Web page

Link to Ordinance 6406

Updated Jan 24 by Laura

THIA will be constantly updating the legislation data. Check back often. Suggest A Correction if you are aware of any missing or incorrect information. AND keep scrolling to learn more about getting guidance.



Building Code — Legislation that speaks to how to construct a tiny house.

Zoning Code — Legislation that speaks to how the lot will be used.


ADU — Accessory Dwelling Unit

DMV — Division of Motor Vehicles

IB — Industrialized Buildings

IRC — International Residential Code

PUD — Planned Unit Development

RV — Recreational Vehicle

SF — Single Family Dwelling

T — Transitional Housing

UDO — Unified Development Ordinance

Please Suggest a Correction if you find broken links or misinformation.

Help us continue helping you. Join the Movement and become a THIA Member today!

Scroll to Top