ADU rules in Mountain View, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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.
Mountain View allows one ADU and one Junior ADU on every single-family lot and up to two detached ADUs on multifamily lots under state-mandated Government Code 65852.2 and the citys adopted ADU ordinance. Maximum size for a detached ADU is at least 1,200 square feet with height up to 16 feet, or up to 18 feet when within one-half mile of a major transit stop, which covers much of Mountain View served by VTA and Caltrain. Owner occupancy cannot be required for ADUs permitted through 2025 and beyond under current state law, and short-term rentals under 30 days are not allowed as the primary ADU use unless the city expressly permits. Setbacks are 4 feet side and rear. AB 1033 now permits ADUs to be sold separately from the main home as condominiums where the city opts in; Mountain View is reviewing adoption. Permits are ministerial within 60 days when the application is complete.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Santa Clara County.
See how other cities in Santa Clara County handle adu rules.
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