Alameda, CA Accessory Structures: Tiny Homes (2026)

The City of Alameda's published code does not contain a stand-alone 'tiny home' category. In practice, a tiny house built on a permanent foundation is treated as an accessory dwelling unit and must meet AMC Section 30-5.18: a detached ADU of up to 800 sq ft, 16 feet in height, with 4-foot side and rear yard setbacks is allowed by right, and total ADU floor area cannot exceed 1,200 sq ft. Such units are reviewed ministerially, cannot be sold separately from the primary residence, and must be rented for terms longer than 30 days. A 'tiny house on wheels' (THOW) is generally classified under state law as a recreational vehicle or trailer rather than a permanent dwelling, and parking/occupying an RV as a residence on a standard residential lot is not authorized as a dwelling unit. California's HCD also recognizes movable tiny houses certified to ANSI/RV standards, but local zoning still governs whether and where they may be placed. Anyone considering a tiny home in Alameda should confirm with the Planning & Building Division whether the unit will be permitted as an ADU on a foundation or treated as an RV. Historic-district design review and the pre-1942 garage Certificate-of-Approval process can also apply if an existing structure is involved.