Tiny home rules in Boulder County, CO — 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.
Boulder County has no separate tiny-home category. A permanent tiny house on a foundation is regulated as a dwelling or accessory dwelling under the Land Use Code and building code; a tiny house on wheels or an RV is not an approved permanent residence outside a licensed manufactured/RV park. Manufactured
The unincorporated county's residences are governed by the Land Use Code and Boulder County Building Code. A site-built or modular tiny house on a permanent foundation is treated like any dwelling or accessory dwelling: it needs a building permit, must meet the district's setbacks and Residential Floor Area limits, and must connect to an adequately sized onsite wastewater system. A tiny house on wheels or a recreational vehicle is not recognized as a permanent dwelling except in a licensed Manufactured Home Park (MH District) or RV park; living in an RV on private land as a residence is not an approved use. Manufactured homes must be installed using county-approved methods and, in floodplains, meet elevation standards.
Living in a tiny house on wheels or an RV as a residence outside a licensed park is a zoning violation; the county may issue notices, require the unit be removed or permitted, and assess fines under Article 4-1300.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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