Larimer County, CO Accessory Structures: Tiny Homes (2026)
Tiny home rules in Larimer 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.
Key Facts
- Tiny house size
- 400 sq ft or less, no lofts
- On foundation
- Legal dwelling with permit
- On wheels (THOW)
- Treated as an RV
- THOW on vacant land
- Max 180 days/12 months
- Code adopted
- 2021 IRC Appendix Q
Summary
By Colorado law a tiny house is 400 sq ft or less (excluding lofts). In unincorporated Larimer County, a tiny house on a permanent foundation is a legal dwelling with a building permit; a tiny house on wheels is treated as an RV and cannot be a year-round home.
By Colorado law and building code rules, Tiny Houses are 400 sq. ft. in floor area or less, excluding lofts... A 'Tiny House on Wheels' (THOW) is still considered a Recreational Vehicle (RV) and is regulated by the Land Use Code (LUC) instead of the building code... They are not considered permanent homes and cannot be occupied year-round.
Full Breakdown
Larimer County follows Colorado law: tiny houses are 400 sq ft of floor area or less, excluding lofts. A 'Tiny House on a Foundation' (site-built or manufactured) can be a legal dwelling if it gets a building permit, is designed for site-specific snow, wind, floodplain and wildfire hazards, and sits on a permanent foundation. The county adopted the 2021 IRC and Appendix Q for tiny houses, requiring minimum 70 sq ft habitable rooms, 6'8" ceilings (6'4" in baths/kitchens), egress, and smoke/CO alarms. A 'Tiny House on Wheels' (THOW) is a Recreational Vehicle regulated by the Land Use Code, cannot be occupied year-round, and on vacant land is limited to 180 days per 12 months in specific zoning districts.
Violations & Fines
Occupying a THOW as a permanent residence, or building a foundation tiny house without a permit, is a Land Use Code / building code violation subject to enforcement.
Frequently Asked Questions
Can I live in a tiny house on wheels full-time?
Is a foundation tiny house legal?
Sources & Official References
Other rules in Larimer County
Compare Larimer County to another location·View the Colorado accessory structures overview
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