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Redwood City, California: ADU Regulations

City or County:

Redwood City, California

Date Updated:



All single-family, mixed-use, multi-family

Types of ADUs:

Attached, Detached, Conversion, Junior


Single-story, Double-story

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:

850 sq.ft., 1,200 sq.ft. for ADUs that meet 11A Standards on accessibility

1,000 sq.ft. for ADUs on RH or R-1 lots larger than 9,999 sq.ft.
Second story ADUs: Max 576 sq.ft. above garages

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: 4’ side and 4’ rear

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


Attached: must meet height standards for underlying zoning district. 16’ for Attached encroaching within the rear yard setback

Detached: 16'


May be attached to, within, or detached from primary dwelling

Rear Yard Coverage:

50% max.


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

Second-story ADUS: No balconies, second story decks or roof decks. Restrict exterior stairs facing immediately adjacent neighbors, and require opaque or clerestory windows when facing immediately adjacent side and rear neighbors.

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!