Broken Arrow, OK Accessory Structures: ADU Rules (2026)
ADU rules in Broken Arrow, OK, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Max ADU size
- 50% of home or 1,200 sq ft
- ADUs per lot
- One only
- Detached ADU setback
- 10 ft from principal building
- Eligible districts
- AG, residential, DROD Areas 1-5
Summary
Broken Arrow allows one attached or detached accessory dwelling unit per lot in agricultural and residential zoning districts, capped at 50% of the primary home's floor area or 1,200 square feet, whichever is less.
5.Accessory dwelling units. In agricultural and residential zone districts, and DROD Areas 1, 2, 3, 4, and 5, an accessory dwelling unit (ADU) is permitted as an accessory to a primary residential structure if the following standards are met:...c.Number. Only one ADU shall be permitted per lot.d.Size of unit.i.The ADU shall not exceed 50 percent of the square footage of the primary structure, or 1,200 square feet of gross floor area, whichever is less.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 43).
Full Breakdown
An ADU is permitted as an accessory to a primary residential structure in Broken Arrow's agricultural and residential zoning districts and DROD Areas 1-5, under Zoning Ordinance Sec. 2-4-2.A.5. Both attached and detached types are allowed. A detached ADU must sit behind the principal building's rear wall, at least ten feet from it, and be no taller than the principal structure (max two stories); an attached ADU must share water, sewer, and electrical utilities with the main house and use an entrance not visible from the street. Only one ADU is allowed per lot, and its size cannot exceed 50 percent of the primary structure's floor area or 1,200 square feet, whichever is smaller. Manufactured homes cannot be used as ADUs outside the RMH district.
Violations & Fines
Constructing an ADU that exceeds the size or height limits, sits closer than ten feet to the principal building, or lacks required parking is a zoning violation that can block occupancy approval or require the structure's removal.
Frequently Asked Questions
Can I build more than one ADU on my Broken Arrow lot?
Does a detached ADU need to match the main house's address?
Sources & Official References
Other rules in Broken Arrow
How Broken Arrow compares: Easiest Cities to Build an ADU·Compare Broken Arrow to another location·View the Oklahoma accessory structures overview
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ADU Rules in Nearby Cities
How other cities in this county handle adu rules.