Oklahoma City, OK Accessory Structures: ADU Permits (2026)

Under Oklahoma City Municipal Code Title 59, the dominant residential districts (R-1 Single-Family Residential and its sub-districts) allow only one principal dwelling per lot. A separate, habitable accessory unit is treated as a second dwelling, which converts the use to two-family and requires either a Special Use Permit under Chapter 59 Article XII or a rezoning. Internal conversions (e.g., a guest suite sharing the main house's kitchen) are permitted as part of the principal dwelling, but a kitchen plus full bath plus separate entrance triggers the secondary-dwelling classification. The Planning Department reviews applications, the Planning Commission holds a public hearing, and City Council issues the final entitlement. Required submittals include site plan, floor plans, elevations, parking layout (one additional space required for the new unit), and demonstration that setbacks, lot coverage, and 35-foot height limits are met. Oklahoma has no statewide ADU mandate comparable to California's Gov. Code 65852.2, so OKC retains full discretion. Severe-weather building requirements (anchoring, wind-load design under the 2018 IRC adopted at Title 11) apply to all detached units. Total entitlement plus building permit timeline is typically 4 to 7 months.