ADU Builders in Oklahoma City
Oklahoma City adopted an accessory dwelling ordinance in 2025, which opened the door to backyard dwellings, garage apartments, and in-house suites in parts of the city. Skullco helps Oklahoma City homeowners and investors work out whether their lot qualifies and then builds it.
Can you build an ADU on your Oklahoma City lot?
The City of Oklahoma City describes the ordinance as applying to certain residential lots in its urban areas. As adopted in May 2025, the main conditions are:
- The site is in the Urban Medium or Urban High land use area of the city's comprehensive plan. The city describes this area as roughly between Interstate 35 on the east, Interstate 44 and the Northwest Expressway on the north and west, and SW 59th Street on the south.
- The lot is zoned R-1, or is zoned NC, R-2, R-3, or R-4 and is occupied by a single-family home.
- The lot is not in a Historic Landmark Overlay District, and is not in a PUD or SPUD that fails to permit the use.
- The lot is at least 50 feet wide to build a new accessory dwelling.
Rules can be amended and zoning details are specific to each parcel, so confirm your lot with the City of Oklahoma City before you commit to plans. We can help you work through that at the start.
What the ordinance requires
Here are the main standards for a new accessory dwelling, in plain language:
| Topic | What the ordinance says |
|---|---|
| Number per lot | One accessory dwelling per parcel, which can be detached, attached with its own entrance, or internal |
| Size | Up to 950 square feet of floor area |
| Height | A detached ADU can be no taller than the main house or 25 feet, whichever is less (25 feet over a garage) |
| Location | Detached ADUs go in the rear yard and must meet the zoning district's setbacks and lot coverage |
| Parking | One off-street space, unless the street is at least 26 feet wide or the ADU is 600 square feet or less |
| Utilities | Water and wastewater connections approved by the city's Utilities Department |
| Ownership | The ADU cannot be sold separately from the main house, and manufactured homes are not allowed |
| Short-term rental | Only if the owner lives on the property, and only with a special exception from the city |
| Permit | A building permit is required for a new ADU or a conversion |
This is a summary, not legal advice. The ordinance text and the city's permitting staff are the authority for your lot.
What do ADUs cost in Oklahoma City?
Cost depends heavily on the type of ADU and your site. As a general guide, here is where accessory dwellings have historically landed:
| Type of ADU | Roughly, total project | What moves the price |
|---|---|---|
| Garage or interior conversion | Roughly $30,000–$80,000 | How much of the structure is reused and how much utility work is needed |
| Attached addition | Roughly $80,000–$150,000 or more | Size, foundation, and finish level |
| Detached new construction | Roughly $100,000–$200,000 or more | Size (up to 950 sq ft here), utilities, site access, and finishes |
These are broad historical ranges from a single general source, not Oklahoma City bids and not a Skullco quote. Every project is unique — the written estimate is the only number that matters.
How a Skullco ADU project works
- Lot review. We check your lot against the ordinance conditions: land use area, zoning, lot width, and any overlay.
- Concept and budget. We talk through the type of ADU, size, and finish level against your budget.
- Plans and permit. Plans are prepared and the building permit is filed. The ordinance also requires a notice sign on the property during permitting.
- Utilities and site work. Water and wastewater connections, foundation, and any access path the ordinance requires.
- Build. Framing, roof, exterior, systems, and interior finish.
- Final walk-through. We walk the finished dwelling with you before the project is closed out.
Who builds ADUs?
Homeowners add an ADU for family, for rental income, or for a home office or studio. Real estate investors look at them as a way to add a unit to an existing property. Because short-term rental is tightly limited by the ordinance, plan around long-term use.
Frequently asked questions
Is an ADU legal in Oklahoma City?
Yes, in the areas and zones the 2025 ordinance covers. It depends on your land use area, your zoning, your lot width, and whether you are in a historic or PUD area, so check your specific lot.
How big can an ADU be in Oklahoma City?
The ordinance caps accessory dwellings at 950 square feet of floor area.
Can I rent my ADU on Airbnb?
Only if you live on the property, and only with a special exception from the city. Most owners plan for long-term tenants or family.
Do I need a permit?
Yes. A building permit is required when you build a new ADU or convert an existing structure.
How much does an ADU cost?
Historically, roughly $30,000 to $80,000 for a conversion and roughly $100,000 to $200,000 or more for a detached new build. Ask us for an estimate based on your lot and plans.