Global Announcement Text

Los Altos Hills, California: ADU Regulations

City or County:

Los Altos Hills, California

Date Updated:

07.02.2019

Zoning:

R-A

Types of ADUs:

Attached, Detached

Stories:

N/A

Lot Size:

Attached/Detached: 1 acre minimum

Maximum ADU Floor Area:

Attached/Detached: 1,000 sq.ft.

Lot Coverage:

N/A

Bedroom:

Min. 1 bedroom

Storage:

No min/max

Kitchen:

Require separate kitchen facilities (permanent range, counters, refrigerator, and sink).

Bath:

Requires at least one full bathroom.

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

Parking:

At least 1 parking space must be provided in addition to 4 mandatory spaces of primary dwelling. Parking space must be 10'x20' and to abide by setback standards of zone. Vehicular access to ADU must be by common driveway with primary dwelling.

Setbacks:

Detached: Same as main residence. 

Attached: Would require a Variance if main residence has LNC setbacks

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

Height:

Two story unit only allowed if existing residence is two story. Height restrictions same as main residence, including codified height exemption.

Location:

If separate from primary dwelling, ADU shall not be sited in a visually prominent location and shall respect the visual and acoustic privacy of primary dwellings on contiguous lots. Additionally, views of prominent scenic features by primary dwellings on contiguous lots to be preserved.

Rear Yard Coverage:

N/A

Design:

Secondary dwelling to be subordinate to and architecturally consistent with the primary dwelling.

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

Entryways:

N/A

Code Source:

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!