Alhambra, CA Accessory Structures: Tiny Homes (2026)

The City of Alhambra does not publish a standalone tiny-home ordinance; tiny dwellings are addressed through the accessory dwelling unit (ADU) standards in Zoning Code Section 23.22.040, which implement California Government Code 66310 et seq. A tiny home placed on a permanent foundation, connected to utilities, and meeting the California Building Code can be permitted as a detached ADU, subject to the same size, height, and setback limits as other ADUs (on single-family lots, detached ADUs may be up to 1,200 sq ft; height up to two stories / 25 ft; minimum 4-foot side and rear setbacks). By contrast, under California's Department of Housing and Community Development rules, a tiny home on wheels (a 'movable tiny house') is classified as a recreational vehicle, requires ANSI certification and DMV registration, and is eligible only for occasional or seasonal use - it cannot legally serve as a permanent residence. Removing the wheels and tongue and setting the unit on an approved permanent foundation is what converts it into a dwelling/ADU. Like other ADUs, a tiny-home ADU in Alhambra may not be used as a short-term rental (Chapter 5.92). Anyone considering a tiny home should confirm foundation, utility, and permitting requirements with Alhambra's Planning and Building divisions, since both city zoning and state building/RV rules apply.