Milpitas, CA Accessory Structures: Tiny Homes (2026)

Milpitas does not have a dedicated tiny-home or 'tiny house on wheels' (THOW) section in its Municipal Code; instead, tiny homes are evaluated under existing residential, ADU, and building-code rules. A tiny house built on a permanent foundation is treated as a single-family dwelling or, more commonly on an already-developed lot, as an accessory dwelling unit under Section XI-10-13.08, which means it must satisfy the City's ADU size, setback, and height standards (such as the 800-square-foot streamlined cap and four-foot setbacks) and the adopted California Residential Code. Under California law, a tiny house on wheels is a structure on wheels and, like any vehicle, must carry valid registration and a license plate; movable tiny homes are generally allowed in RV and mobile-home parks rather than as stand-alone dwellings on a typical residential lot. California cities and counties set their own zoning, and some jurisdictions have adopted ordinances expressly permitting movable tiny houses as ADUs, but Milpitas's code does not provide that specific allowance, so a THOW used as a backyard dwelling would face the same obstacles as elsewhere absent a local provision. Anyone considering a tiny home in Milpitas should confirm the current pathway with the Planning Department before committing, because the most reliable route is a foundation-based ADU that complies with Section XI-10-13.08.