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Redwood City, California: ADU Regulations

City or County:

Redwood City, California

Date Updated:




Types of ADUs:

Attached, Detached



Lot Size:

No min/max but must follow zoning guidelines on lot coverage, lot must have existing or proposed single-family dwelling.

Maximum ADU Floor Area:

700 sq.ft., 800 sq.ft. for ADUs that meet 11A Standards on accessibility

900 sq.ft. for ADUs on RH or R-1 lots larger than 9,999 sq.ft.

Lot Coverage:

Must follow zoning guidelines for lot coverage.


No min/max.


No min/max.


Requires separate kitchen facilities (must be a stove/oven, 220amp circuits, sink and food preserving appliance. Wet bars with countertop ovens not acceptable.)


Requires separate bathroom facilities.

Note: Drainage and sewer connections should be assessed on a project by project basis.


No additional parking required.


Attached: must meet setback standards for underlying zoning district.

Detached: must be 10' from rear property line, at least 6' from any other structure and meet minimum side yard setback for zoning district.

Note: Fire Department regulations should be assessed on a project by project basis.


Attached: must meet height standards for underlying zoning district.

Detached: 14'


May be attached to house or detached in rear yard.

Rear Yard Coverage:

50% max.


Must be architecturally compatible with style, exterior paint, and materials of single-family dwelling on same lot.

Note: Historic Neighborhoods or Districts should be assessed on a project by project basis.


Garage or patio doors may not be used as main entrance, unit must be accessed by a side-hinged swinging door.

Source Code:

Important Note: Rules and regulations are updated and changed frequently. It’s one of our jobs to be up to speed and navigate those regulations. Let us know if our website isn’t up to date or if you have any information that could help. Cheers!