Grand Junction, CO Accessory Structures: Tiny Homes (2026)

The Zone and Development Code's definitions chapter, § 21.14.020, sets out five conditions a structure must meet to be a tiny home rather than a manufactured home or recreational vehicle: it must be permanently constructed on a vehicle chassis, designed for long-term residency, built with electrical, mechanical or plumbing services fabricated off-site, not self-propelled, and no larger than 400 square feet. On top of those five elements, the definition adds a construction standard: to qualify, the unit must be built to the International Residential Code as adopted by the Building Codes and Standards program within Colorado's Division of Housing, and a compliant unit receives a metal plate insignia certifying it meets that program's codes and standards.

The definition expressly excludes manufactured homes, recreational park trailers and recreational vehicles from counting as tiny homes, so a park model RV parked in a driveway does not get tiny-home treatment no matter its size. Once a structure meets the definition, § 21.14.020 says it may function as a single-unit detached dwelling unit or as an accessory dwelling unit, and a separate definition entry for Dwelling, single-unit detached confirms that manufactured homes and tiny homes are both treated as single-unit detached dwellings for zoning purposes.

That dual classification matters because it means a certified tiny home can be sited on its own lot under the single-unit detached use standards, or added to an existing lot as an ADU under the accessory dwelling unit standards in Chapter 21.04, without needing a separate tiny-home use category or variance.