Building permits, zoning and land rules in Washington County, Oklahoma

At a glance

Building permit

Not required outside about three miles of Bartlesville; required inside that zoning jurisdiction¹

Zoning

Applies only within about three miles of Bartlesville; unzoned elsewhere in the county⁷

Septic

DEQ authorization is required before installation or modification, followed by inspection and approval⁴⁵⁶

RV / tiny home outside Bartlesville jurisdiction

No zoning or building-permit rule was found; confirm with the Community Development Office⁷¹

Owner-builder exemption

Not confirmed for the Bartlesville jurisdiction; ask before you plan to self-build⁸

Minimum lot size (new plat outside city limits)

2.5 acres minimum to record a residential plat without state approval⁹

Wells

No drilling authorization for qualifying domestic wells; OWRB approval is required before drilling for non-domestic use¹⁰

Who to call

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in Washington County, Oklahoma?

Unincorporated Washington County, Oklahoma does not require a general building permit for a home¹. The county's own Community Development page states that its code-enforcement work in unincorporated areas is limited to violations of state statute, not a general building code¹¹. The one exception is the roughly three-mile-wide Bartlesville-Washington County zoning jurisdiction around the city of Bartlesville, where the City of Bartlesville's Community Development Department issues building permits⁷². If your land sits inside that jurisdiction, budget for a small state add-on on top of the local fee: Oklahoma law caps the Uniform Building Code Commission's own share of a construction permit at $5, and the commission's FAQ currently lists it at $4¹². Outside that jurisdiction, no building-permit process was found for unincorporated Washington County¹.

Who is the Washington County building department, and how do you reach them?

Washington County itself has no general building department¹. The Washington County Community Development Office handles floodplain review, E911 addressing and code enforcement for state-statute violations in the unincorporated county; reach it at (918) 331-2710¹¹. Inside the Bartlesville-Washington County zoning jurisdiction, building permits and inspections go through the City of Bartlesville's Community Development Department at 918.338.4244, and planning and zoning questions go to the same department's Planning & Zoning line at 918.338.4243, both based at 401 S. Johnstone Ave., Bartlesville, OK 74003²³. Driveways onto county roads are a Board of County Commissioners matter; reach the board at (918) 337-2820 at the Washington County Admin Building¹³.

Does Washington County have zoning?

Washington County has zoning only within about three miles of Bartlesville, the joint Bartlesville-Washington County zoning jurisdiction⁷. Land outside that jurisdiction is unzoned⁷. Inside the jurisdiction, the City of Bartlesville's Planning & Zoning division sets the districts and standards, including any setback, minimum-home-size, RV and tiny-home rules for a specific parcel; call that office before you plan a build there³. Oklahoma law exempts the usual farm buildings used for agricultural purposes, and the planning of agricultural crops, from a city or county zoning ordinance's reach, and construction of a farm home or other farm building under the same Title 19 planning-and-zoning act needs no zoning fee or permit¹⁴¹⁵. That exemption is narrow: it does not waive septic, highway-access or other state and local approvals that still apply.

How do septic permits work in Washington County?

The Oklahoma Department of Environmental Quality (DEQ), not Washington County, administers septic systems⁴. Before installing a new system or modifying an existing one, buy an Authorization to Construct from DEQ and have DEQ review the Report for On-Site Sewage; DEQ must issue the authorization before work begins⁵. A new or modified system must be inspected and approved by DEQ, or installed, self-inspected and approved by a certified installer, before it is used; a certified installer's final inspection must reach DEQ within 15 days of completion⁶. Call the DEQ On-Site Sewage Program at (405)702-6100 before choosing a system¹⁶. USDA soil ratings show 0% of Washington County soils without severe limits for a conventional drain field, so make the site evaluation an early purchase contingency rather than assuming a standard gravity system will work¹⁷.

Can you live in an RV or tiny home on your land in Washington County?

Outside the Bartlesville-Washington County zoning jurisdiction, no zoning ordinance or building-permit requirement was found for unincorporated Washington County⁷¹, and the county's Community Development Office does not run general code enforcement there beyond state-statute violations¹¹. That absence of a found rule is not a confirmed answer, so call the Community Development Office at (918) 331-2710 before you set up an RV or tiny home, especially if the parcel sits in a floodplain, which that office also reviews¹¹. Inside the roughly three-mile Bartlesville jurisdiction, the City of Bartlesville's Planning & Zoning division sets the applicable district and its RV and tiny-home rules; call 918.338.4243 to ask about your specific parcel³. If you plan to occupy a manufactured home anywhere in Oklahoma, state rules treat an occupied manufactured home as a permanent installation that must follow HUD's Manufactured Home Model Installation Standards (24 CFR Part 3285) or DAPIA-approved manufacturer installation instructions¹⁸.

Building a home in Washington County: the steps, in order

1. Confirm whether your parcel is inside the Bartlesville-Washington County zoning jurisdiction (about three miles around Bartlesville) or in the unzoned rest of the county; call the Washington County Community Development Office at (918) 331-2710 to check¹¹⁷.
2. If you're inside that jurisdiction, apply for a building permit and any needed zoning approval through the City of Bartlesville's Community Development Department (918.338.4244 for permits, 918.338.4243 for zoning)²³, and budget for the small state OUBCC add-on fee, capped at $5, on top of the local fee¹².
3. Either way, contact the Oklahoma DEQ On-Site Sewage Program at (405)702-6100, have the Report for On-Site Sewage reviewed, and obtain an Authorization to Construct before installing or modifying a septic system¹⁶⁵. Do not use the system until DEQ or a certified installer has inspected and approved it⁶.
4. If your driveway will connect to a state highway, apply for an ODOT Driveway Agreement before any work begins on the right-of-way; the agreement expires if the driveway isn't built within six months unless you get a written extension¹⁹.
5. If your driveway connects to a county road instead, check with the Washington County Board of County Commissioners at (918) 337-2820, which maintains and constructs county roads and bridges¹³.
6. If you're creating a new residential plat outside Bartlesville's corporate limits, know that Oklahoma won't let the county clerk record a plat with any lot under 2.5 acres without state Department approval, and the plat must disclose your water-supply and sewage-treatment plan⁹²⁰.
7. Confirm E911 addressing with the Community Development Office so emergency services and your address are set correctly before you build¹¹.

What to check before you buy land in Washington County

Washington County averages 41.5 inches of precipitation a year and sits in severe drought about 23% of years, so ask about existing wells and water rights before you buy²¹²². OWRB drilling authorization is not required for household wells, livestock up to the land's grazing capacity, or irrigation of less than 3 acres, but it is required before a contractor drills a well for non-domestic use, which may also require an active groundwater-use permit¹⁰. About 96.7% of the county's land sits at 15% slope or less, and 22.6% is wooded²³²⁴. Check the floodplain status of any specific parcel with the Community Development Office, which reviews floodplain issues for unincorporated areas¹¹. The county's population density is about 129 people per square mile, and the nearest city of 100,000 or more people is about 44 miles from the county's center²⁵²⁶. Typical property tax runs about 0.9% of value, with a median bill near $1,505 a year²⁷²⁸. If you're subdividing or replatting raw acreage, confirm your plat meets the state's 2.5-acre minimum and sewage-disclosure rules before you list or record it⁹.

Watch-outs

• Washington County's owner-builder exemption status is unconfirmed; no county or city page states whether an owner-builder can skip a permit inside the Bartlesville jurisdiction — ask the Community Development Department at 918.338.4244 before you plan to build it yourself⁸².
• Confirm which side of the roughly three-mile Bartlesville-Washington County zoning line your parcel falls on before you assume no permit or zoning applies — that line, not the county's own borders, decides the answer⁷.

Sources

1. Washington County Community Development (2026 county census)
2. City of Bartlesville Community Development Department - Building Permits & Inspections (cityofbartlesville.org)
3. City of Bartlesville Community Development Department - Planning & Zoning (cityofbartlesville.org)
4. On-Site Sewage Treatment, quoted and re-checked
5. On-Site Sewage Treatment, quoted and re-checked
6. On-Site Sewage Treatment, quoted and re-checked
7. Bartlesville-Washington County Zoning Regulations (Municode) (2026 county census)
8. (2026 county census)
9. Oklahoma Statutes, Title 27A — Environment and Natural Resources (Oklahoma statewide rule), quoted and re-checked
10. Wells & Licensing, quoted and re-checked
11. Washington County Community Development Office (washingtoncountyok.gov)
12. FAQs (Oklahoma statewide rule), quoted and re-checked
13. Washington County Board of County Commissioners (washingtoncountyok.gov)
14. Oklahoma Statutes, Title 19 — Zoning exemptions and farm-building permits (Oklahoma statewide rule), quoted and re-checked
15. Oklahoma Statutes, Title 19, Section 19-863.25 (Oklahoma statewide rule), quoted and re-checked
16. Oklahoma Department of Environmental Quality - On-Site Sewage Programs (oklahoma.gov)
17. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
18. Title 765 Oklahoma Used Motor Vehicle and Parts Commission Rules and Regulations (Oklahoma statewide rule), quoted and re-checked
19. Instructions for Driveway Permit Application (Oklahoma statewide rule), quoted and re-checked
20. Oklahoma Statutes, Title 27A — Environment and Natural Resources (Oklahoma statewide rule), quoted and re-checked
21. Annual precipitation: Bolthole Index county data
22. Share of years in severe drought: Bolthole Index county data
23. Share of land at 15% slope or less: Bolthole Index county data
24. Wooded share of land: Bolthole Index county data
25. Population density: Bolthole Index county data
26. Distance to the nearest metro area: Bolthole Index county data
27. Effective property tax rate: Bolthole Index county data
28. Median property tax bill: Bolthole Index county data

Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.