ADU rules in Oklahoma City, OK — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Oklahoma City Ordinance 27847 amended Chapter 59 (Zoning) to allow Accessory Dwellings as a conditional use in R-1, R-2, R-3, and R-4 residential districts. Maximum floor area is 950 sq ft, with one ADU per parcel. Manufactured homes are prohibited as ADUs.
Under the Chapter 59 ADU standards (codified at § 59-9350.2.1), an Accessory Dwelling provides complete independent living facilities (sleeping, cooking, sanitation) on the same parcel as a Principal Dwelling. Total floor area cannot exceed 950 sq ft. Detached ADU height cannot exceed the height of the Primary Dwelling or 25 feet, whichever is less. Detached ADUs must be located in the rear yard and meet underlying district setbacks. One off-street parking space is required unless paved street frontage curb-to-curb is 26 feet or greater (or the ADU is 600 sq ft or smaller). The ADU cannot be subdivided from ownership of the Principal Dwelling. Manufactured Homes are not allowed as ADUs. State zoning enabling authority is 11 O.S. § 43-101 et seq.
Constructing an ADU without a Conditional Use approval or building permit triggers stop-work orders and Chapter 59 enforcement by OKC Development Services. Subdividing the ADU from the principal lot ownership violates the use standard.
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