Global Announcement Text

Mountain View, California: ADU Regulations

City or County:

Mountain View, California

Date Updated:

12.9.2018

Zoning:

R1

Types of ADUs:

Attached, Detached and Garage Conversion

Stories:

Detached: Single story

Attached: Second story, over garage

Lot Size:

No minimum

Maximum ADU Floor Area:

700 sq.ft.

Lot Coverage:

Must comply with underlying zoning regulations.

Bedroom:

No min/max.

Storage:

No min/max.

Kitchen:

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

Bath:

Require separate bathroom facilities.

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

Parking:

One space per unit can be covered or uncovered. Shared parking (driveway, garage, or carport) permitted provided ADU has direct, unobstructed access to parking space.

Setbacks:

Side: 1-story detached, 5 ft. min, 12 ft. total.

Attached or garage conversions must follow setbacks in Sec. 36.10.25.

Rear: 1-story detached, 10 ft. min.

Attached or garage conversions must follow setbacks in Sec. 36.10.25.

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

Height:

Detached: 16 ft. max

Attached: 28 ft. max

Location:

Attached: Basement, ground level or above garage with no internal access to primary dwelling.

Detached: Rear half of lot, at least 10 ft. from primary dwelling or other structures.

Above detached garage: rear half of lot.

Rear Yard Coverage:

30% max., including any other accessory structures, and projections of primary dwelling.

Design:

The design to conform in general to design of primary dwelling.

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

Entryways:

Attached must have separate exterior entry.

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!