Oklahoma City, OK Accessory Structures: ADU Impact Fees (2026)

Oklahoma City does not operate a Texas-style Local Government Code Ch. 395 impact-fee program for residential growth. Instead, new dwelling units pay water and wastewater connection fees through the City Utilities Department based on meter size, plus a Stormwater Utility fee billed monthly. A new 5/8-inch water meter and tap typically costs $1,500 to $3,000; wastewater connection charges run $500 to $1,500. If the secondary dwelling shares the primary meter, water connection charges may be avoided, but the wastewater Equivalent Dwelling Unit (EDU) charge generally still applies. Building permit fees through the Development Center scale with project valuation - roughly $7.50 per $1,000 valuation for residential, plus separate plumbing, electrical, mechanical, and gas permits each running $50 to $200. Oklahoma has no fee-waiver statute for ADUs (compare Cal. Gov. Code 65852.2(f) waiving impact fees on ADUs under 750 sq ft). Park land dedication or fee-in-lieu may apply for new dwelling units under Title 59 Chapter 22. School impact fees are not charged in Oklahoma. Total city-side fees commonly run $3,000 to $7,000 for a typical secondary dwelling.