ADU vs. JADU Permit Rules: What You Need to Know

Accessory Dwelling Units (ADUs)

Self-contained living units with their own kitchen, bathroom, and entrance. They can be attached or detached from the primary residence and are typically between 150 to 1,200 square feet in size.

Junior Accessory Dwelling Units (JADUs)

Smaller units, up to 500 square feet, created within an existing single-family residence or attached garage. They may share sanitation facilities with the primary dwelling and are designed to be more affordable and less intrusive.

📋 Permit Rules for ADUs vs. JADUs

1. Zoning and Location

ADUs: Permitted on single-family and multi-family residential zoned lots.
JADUs: Only permitted on single-family residential zoned lots.

2. Size Limits

ADUs: Minimum of 800 square feet for a studio or one-bedroom unit, up to 1,200 square feet for two or more bedrooms.
JADUs: Must not exceed 500 square feet.

3. Parking Requirements

ADUs: One parking space required for newly constructed units unless the unit is:

Within 1/2 mile of public transit.
Created within the area of an existing building.
In a historic district.
Not offered an on-street parking permit when one is required.
On the same block as a car share.
A studio unit.

JADUs: No parking is required

4. Owner Occupancy

ADUs: No owner occupancy requirements.
JADUs: Owner must reside in either the primary residence or the JADU.

5. Kitchen and Sanitation Facilities

ADUs: Must have a full kitchen and bathroom.
JADUs: Must have an efficiency kitchen and may share sanitation facilities with the primary dwelling.

6. Separate Address

ADUs: Require a separate address.
JADUs: Require a separate address.

7. Rental Terms

ADUs: Can be rented for periods of 30 days or more.
JADUs: Can be rented for periods of 30 days or more.

FAQ

Can I convert my garage into an ADU or JADU?

Yes, both ADUs and JADUs can be created by converting an existing garage, provided that all zoning and building code requirements are met.

Do I need a permit to build an ADU or JADU?

Yes, both ADUs and JADUs require permits. The specific requirements vary by location, so it's essential to consult with your local planning department.

Can I rent out my ADU or JADU?

Yes, both units can be rented out for periods of 30 days or more. However, some jurisdictions may have additional restrictions, so it's important to check local regulations.

How long does it take to get a permit for an ADU or JADU?

California law allows for the construction of one ADU and one Junior ADU (JADU) on single-family lots. However, local zoning laws may impose additional restrictions.