Tiny home rules in Rocklin, CA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Rocklin allows fixed-foundation tiny homes only as Accessory Dwelling Units (ADUs) or Junior ADUs (JADUs) under Rocklin Municipal Code Chapter 17.67 and California Government Code 65852.2/65852.22. Detached ADUs are capped at 1,200 sq ft and 16 feet in height (18 feet within a half-mile of major transit), and JADUs are capped at 500 sq ft. Movable tiny homes on wheels are not addressed in Rocklin's published ADU standards and would generally be regulated as recreational vehicles under Title 10/17, which do not authorize permanent occupancy outside a permitted RV park.
Rocklin's Accessory Dwellings page (RMC Ch. 17.67) sets detached-ADU maximums at 1,200 sq ft total floor area and 16 feet in height (18 feet near transit, per Gov. Code 65852.2(c)(2)(D)), with 4-foot side and rear setbacks. Attached ADUs may be 60% of the primary dwelling up to 1,200 sq ft (studio/1-bed capped at 850 sq ft, 2+ bedrooms capped at 1,000 sq ft). JADUs follow Gov. Code 65852.22 at 500 sq ft maximum and require owner occupancy in either the primary residence or the JADU. A factory-built tiny home placed on a permanent foundation can qualify as an ADU if it meets California Building Code or HCD (Health & Safety Code 18000 et seq.) standards. Tiny homes on wheels classified as park trailers or RVs (HSC 18010) are not permitted as permanent dwellings on residential lots in Rocklin outside a state-licensed RV park.
Living in a tiny home on wheels on a Rocklin residential lot as a permanent residence violates Title 17 zoning (no permitted second dwelling outside the ADU process) and Title 8 nuisance provisions. Building an ADU-tiny-home over 1,200 sq ft, over 16 feet tall, or without a permit violates Ch. 17.67 and Title 15 building permit requirements; enforcement may include stop-work orders, double fees, and removal orders.
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