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πŸ—οΈ Accessory Structures/ADU Rules

ADU Rules: Mountain View vs Sunnyvale

How do adu rules rules compare between Mountain View, CA and Sunnyvale, CA?

Mountain View and Sunnyvale have similar restriction levels.

Mountain View, CA

Santa Clara County

Few Restrictions

Mountain View ADU regulations follow California Government Code 65852.2 as amended by AB 68, AB 881, SB 13, and AB 1033. Ministerial approval applies to most ADUs and JADUs on single-family lots.

View full Mountain View rules β†’

Sunnyvale, CA

Santa Clara County

Few Restrictions

Sunnyvale allows ADUs and JADUs on single-family and multifamily lots under California Government Code 65852.2 plus AB 68, 881, and SB 13. AB 1033 now allows ADUs to be sold as separate condos.

View full Sunnyvale rules β†’

Key Facts Comparison

FactMountain ViewSunnyvale
ADU per lotOne ADU plus JADU-
Min max sizeAt least 1,200 sq ft-
Setback4 ft side and rear-
Height transitUp to 18 feet-
Review time60 days ministerial-
State law-Gov Code 65852.2 plus AB 68, 881, SB 13
Max detached ADU-1200 square feet
JADU size-Up to 500 square feet
Setbacks-4 feet side and rear
AB 1033-Condo sale if city opts in

Highlighted rows indicate differences between cities.

Mountain View FAQ

Do I need to live on site to build an ADU?

No. State law currently prohibits Mountain View from imposing owner-occupancy on standard ADUs, though a JADU generally requires owner occupancy of either unit.

Can I short-term rent my ADU?

ADUs in Mountain View may not be used as short-term vacation rentals under 30 days; long-term rental is the standard allowed use.

Sunnyvale FAQ

Do I need extra parking for my Sunnyvale ADU?

No additional parking is required if your property is within a half mile of public transit, which covers most of Sunnyvale.

Can I sell my ADU as a separate condo?

Only if Sunnyvale has opted into AB 1033. Check with the Planning Division for current local policy.

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