City of Santa Clara, CA

City of Santa Clara ADU Regulations


Zoning:

R1-8L/R1-6L

Lot Size:

No minimum provided the lot already has an existing single-family dwelling and the lot can sustain an ADU that meets yard coverage limits and necessary setbacks.

Maximum ADU Floor Area:

Lots less than 6,000 sq.ft.: Floor Area Ratio of .40 for all structures

    Attached ADU: 50% of living area of main dwelling up to 1,200 sq.ft.

    Detached ADU: 1,200 sq.ft.

Lots greater than 6,000 sq.ft.: Floor Area Ratio is not applicable

    Attached ADU: 50% of living area of main dwelling up to 1,200 sq.ft.

    Detached ADU: 1,200 sq.ft.

No. of Bedrooms:  

Lots less than 6,000 sq.ft.: one bedroom maximum

Lots greater than 6,000 sq.ft.: two bedrooms maximum

Storage / Closet:

No min/max

Kitchen / Bath:   

Require separate bathroom and kitchen facilities (permanent range, counters, refrigerator, sink). Max. 1 bathroom.

Parking:

Properties with an ADU are not required to provide additional onsite parking beyond lot requirements. If required covered parking is demolished during the development of the ADU, two replacement parking spaces must be provided. Additionally, if main dwelling unit is subject to a preferential parking permit program for on-street parking, ADU to also be eligible for preferential parking permit program.

Setbacks:  

For lots less than 6,000 sq.ft.:

    Attached ADU: Front 20’ | Interior Side 5’ | Side Corner 15’ | Rear 20’

Detached ADU: Front 5’ beyond front setback of main dwelling | Interior Side 3’ | Side Corner 15’ | Rear 5’

For lots greater than 6,000 sq.ft.:

Attached ADU: Front 20’ | Interior Side 5’ | Side Corner 15’ | Rear 20’

Detached ADU: Front 5’ beyond front setback of main dwelling | Interior Side 3’ | Side orner 15’ | Rear 5’

Height:

For lots less than 6,000 sq.ft.:

    Attached ADU: One story | 25’ max

    Detached ADU: One story | 14’ max

For lots greater than 6,000 sq.ft.:

    Attached ADU: Up to two stories | 25’ max

    Detached ADU: One story | 14’ max

Location:

N/A

Rear Yard Coverage:

40% total

Materials / Design:

The roof, siding and windows must be consistent with the roof slope, materials and design of the main dwelling. Additional design regulations apply to attached second-story ADUs.

For attached second-story ADUs:

• Second-floor area of the building shall not exceed 66% of the first-floor building area (including the garage area).

• 5’ front step back from the front wall of the main dwelling unit.  10’ step back if the garage is closest to the front property line.

• 3’ side and rear setbacks from the walls of the first floor, or clerestory windows with 5’ sill height are required.

• Second-floor balconies must be located on rear elevations and setback 15’ from a side property line, with a maximum depth of 4’.

• The floor to ceiling height must be equal to or less than the average floor to ceiling height of the first floor (7’ minimum).

ADUs planned for lots registered on the City’s Historic Properties List are subject to additional design review.

Entryways:

Enclosed or internal staircases to access attached second-floor ADUs are required.

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