What's Required in Oklahoma City
- Building permit required for any secondary dwelling unit.
- Must have full kitchen and bathroom facilities.
- Requires architectural plan set including foundation and framing.
- Must meet lot coverage and setback rules for accessory buildings.
- Separate or combined utility permit for water and sewer.
- Owner-occupancy of the primary home is often required.
How Much Does an ADU Permit Cost in Oklahoma City?
Budget $500–$1,500 for the Oklahoma City permit itself (valuation-based), issued by the Development Services Department — but treat that as the entry fee, not the total. ADUs are full dwelling units, so the permit stack usually includes building, electrical, plumbing, and mechanical trade permits, plus plan review. One local note: includes building permit and utility impact charges. Get an itemized fee estimate from the department before finalizing your budget; the spread between a simple conversion and a new detached build is wide.
ADU Size Limits and Zoning Rules in Oklahoma City
Before drawing plans, check the two gates that sink most ADU projects: size and zoning. Size ceilings vary by lot and ADU type (attached, detached, or conversion), so confirm your specific configuration. Other recorded conditions: owner-occupancy of the primary home is often required. Setbacks, height limits, and utility connections layer on top of those rules. The Development Services Department can confirm what your specific lot allows — worth doing before you pay for architectural drawings rather than after.
How to Get a ADU Permit in Oklahoma City
Step 1: Zoning Check
Confirm your lot allows for a second dwelling unit.
Step 2: Submit Plans
Upload architectural drawings and a site plan to the portal.
Step 3: Agency Reviews
Checked for zoning, drainage, and building code safety.
Step 4: Inspections
Full series: Footing, Framing, Trades, and Final.
Step 5: Occupancy
Final sign-off required before the unit can be lived in.