Santa Clara County, CA

Accessory Dwelling Unit (ADU) City Regulations


Zoning:

Allowable Urban Districts: R1/R1E/RHS/R1S/R3S/A1
Allowable Rural Zones: A/AR/HS/RR

Lot Size:

Urban Districts:

On lots less than 10,000 sq. ft. only attached ADUs allowed. On lots larger than 10,000 sq. ft. either attached or detached permitted.
Rural Districts:

On lots .5 to less than one acre, only attached ADUs allowed. The min. lot size for detached is one acre.

ADU Floor Area:

Urban Attached:

Lots <20,000 sq.ft., 800 sq.ft. max;

Lots >20,000 sq.ft., 1,000 sq.ft. max

Urban Detached: 1,000 sq.ft. max

Rural Attached:

Lots <1 acre, 800 sq.ft. max

Lots 1-2.5 acres, 1,000 sq.ft.

Lots >2.5 acres, 1,200 sq.ft.

Rural Detached:

Lots <1 acre, 800 sq.ft. max.

Lots 1-2.5 acres, 1,000 sq.ft.

Lots >2.5 acres, 1,200 sq.ft.

No. of Bedrooms:  

Max. 2 bedrooms

Storage/Closet:

No min/max

Kitchen/Bath:  

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

Junior may include separate bathroom or may share bathroom with existing structure.

Parking:

One off-street parking space per unit required for secondary dwelling.
One additional space required for a secondary dwelling with more than one bedroom.

For applicable parking exemptions, see Section 4.10.340(FX3).

Setbacks:  

Must follow guidelines of underlying zoning district.
Setback of no more than five feet from side and rear property lines required for above existing garage units.

Height:

21' max

Location:

Urban ADUs may be no nearer than 6' to primary dwelling.

Rear Yard Coverage:

Must follow requirements established by zoning district in which lot is located.

Materials/Design:

Unless noted on Priority Lists No. 1 and 2, design standards are advisory. Certain features, materials or forms may be required by means of design review or ASA approval.

Entryways:

N/A

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