Owasso, OK Accessory Structures: Tiny Homes (2026)

Tulsa County Building Inspections permits foundation-built tiny homes as dwellings under the 2018 International Residential Code Appendix Q (Tiny Houses) — adopted as part of Oklahoma's building code framework. Appendix Q specifications for homes ≤400 sq ft: minimum ceiling height 6'8" in main living area (6'4" in lofts), lofts min 35 sq ft with min 16" clear headroom, stairs/ladders to lofts with specific rise/run rules, emergency egress window from sleeping loft (min 5.7 sq ft opening). Foundation required per IRC Chapter 4. Standard residential minimum-square-footage rules in Tulsa County Title 42 §45.010 may apply — some districts require 600-800 sq ft minimum dwelling, effectively limiting tiny homes. Tiny homes on wheels (THOW) are classified as recreational vehicles under Oklahoma Title 47 §1-140 and cannot be used as permanent residences in most residential zones under Title 42 §90.010. Some Tulsa County RV parks and campgrounds allow extended THOW stays (with limits per state RV-park rules OAC 310:285). ADU provisions in Tulsa County are limited — accessory dwelling units require conditional use permit under Title 42 §90.150 and must meet standard dwelling codes. Tulsa city allows ADUs in some districts under 2017 zoning update (Title 51 §90). Park Model RVs (400 sq ft per ANSI A119.5) are classified as RVs not dwellings. Utility connections (water, sewer or septic, electric) required for legal occupancy. Oklahoma has no tiny-home-specific state preemption.