Legalize Existing ADU

Does your property have an unpermitted ADU or JADU constructed? Has a garage, basement, or other room been converted into a separate living unit without obtaining a building permit?

The City of Mountain View has a process to legalize unpermitted ADUs. No code enforcement action or penalties will be assessed on unpermitted ADUs.

Eligible Properties

• The unit was built or converted prior to January 1, 2020;
• There is not an existing building permit for the unit; and
• The zoning of the property allows for an ADU

Reasons to Legalize Your Unit

• Reduce Risks to Occupants. Unpermitted units may present safety risks to occupants.
• Reduce Liability. An illegal unit poses liability to the owner.
• Save Money. Property owners who legalize the ADU/JADU will not be charged penalty or violation fees.
• Save Time. Property owners will benefit from an expedited building permit review.
• Peace of Mind. Legalizing an ADU/JADU can eliminate worries about building and life safety or future code enforcement action.

Your Pathway To A Legalized ADU

These steps provide an overview of the ADU legalization process. Each project is unique and may require modifications to this process.

1. Review the Regulations. Review the zoning and building code requirements to determine if the program is right for you.
2. Contact the City. Contact the Planning Division for questions related to ADU zoning regulations. Contact the Building Division to discuss building code and building permit requirements.
3. Additional Research. Conduct research, as needed, to understand the costs and benefits associated with having an ADU on your property. For example, consult a tax advisor to understand any property tax implications.
4. Draft Building Plans. Work with an architect/ engineer to prepare building plans. Plans must comply with the City’s ADU
5. Standards. Submit Plans to City Submit a building permit application to the Building Inspection Division at www.mountainview.gov/building.
6. Building Permit Issuance. The plans may require more than one round of City review. Once plans are in good order, a building permit will be issued.
7. Construction and Inspections. Once building permits are issued, construction may commence. You may schedule inspections online.
8. Legal ADU. Once construction and all necessary inspections are completed, the unit is legal.