Accessory Dwelling Units

Accessory Dwelling Units (ADU)

Accessory Dwelling Units (ADUs) are known by many names: granny flats, in-law units, backyard cottages, secondary units and more. No matter what you call them, ADUs are an innovative, affordable, effective option for adding much-needed housing.

An ADU must be on a permanent foundation, have independent exterior access, and provide complete independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking, and sanitation. A Junior ADU can share sanitation facilities with main residence.

ADU Permit applications may be required to conform to All-Electric Building Ordinance and include only all-electric appliances and fixtures.
Learn more about the All- Electric Building Ordinance (Link).

State Guidance for ADUs

Learn more about the State Law and Guidance for ADUs

  1. Permit New ADU
  2. Permit Existing ADU

Planning Approvals

Building Permit Requirements

If you are thinking about making any improvements to your home or parcel, and you have a septic system, you need to have your plans reviewed by Environmental Health.
Learn more about Septic System permitting.