Oklahoma County, OK Accessory Structures: Tiny Homes (2026)

Oklahoma County tiny home regulation varies by construction type and location. Foundation-built tiny homes must meet Oklahoma City Building Code adopted IRC standards. OKC §59-4100 residential zoning requires minimum dwelling size of 400-600 square feet in most residential zones, though the IRC Appendix Q (tiny houses under 400 sq ft) is not fully adopted. Edmond and Midwest City have similar minimums. Tiny homes on a permanent foundation must have: connected potable water and sewer (or approved septic under OK Dept of Environmental Quality 252:645), approved heating/cooling meeting IRC, minimum ceiling height 7 feet (6'8' in bathrooms/kitchens), loft access meeting ladder/stair code, one compliant egress window per sleeping area, and smoke/CO detectors. Tiny homes on wheels (THOW) are classified as recreational vehicles under 47 O.S. §1-135 and cannot be used as permanent dwellings in OKC residential zones per §59-9210. RVs may be parked on private property but not occupied as residence long-term (typically 30-day maximum). Some rural unincorporated Oklahoma County areas are more permissive. OKC approved ADU regulations in 2020 (§59-7270) allowing accessory dwelling units in RD-1, R-1, R-2, and R-3 zones — a tiny home built as an ADU is permissible if it meets the minimum size and code requirements. Tiny home RV parks require zoning approval as RV parks. The Oklahoma Tiny Homes Association advocates for more inclusive zoning.