Benton County, OR Accessory Structures: Tiny Homes (2026)
Tiny home rules in Benton County, OR, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.
Key Facts
- Classification
- Group R-5 wheeled residential structure
- Building permit
- Not accepted for tiny houses on wheels
- Governing standard
- RV occupancy rules, Development Code Chapter 91
- Defining code
- 2018 Oregon Reach Code R119.1.2
Summary
Benton County will not issue a building permit for a tiny house on wheels, classified as a Group R-5 wheeled residential structure under the 2018 Oregon Reach Code. Instead, placement of one on unincorporated land is governed by the recreational-vehicle occupancy standards in Chapter 91 of the Benton County Development Code, not the building permit process.
11.100 - Plans and Permits. (1)The building official shall neither recognize nor accept a permit application for the construction, reconstruction, alteration, or repair of a Group R-5 wheeled residential structure (commonly referred to as "tiny house on wheels") as defined by 2018 Oregon Reach Code R119.1.2. Placement of such structure is subject to the provisions of BCC Ch. 11.263. ... 11.263 - Tiny Houses, R-5 Occupancy. Placement of Group R-5 wheeled residential structure, as defined by 2018 Oregon Reach Code R119.1.2, is subject to the standards regarding Occupancy of Recreational Vehicles in Chapter 91 of the Benton County Development Code.
Full Breakdown
2. That carve-out routes tiny houses on wheels out of the ordinary building-permit track entirely. 263 confirms where the rule actually lands: placement of a Group R-5 wheeled residential structure is subject to the standards for Occupancy of Recreational Vehicles found in Chapter 91 of the Benton County Development Code, the same development-code chapter that also covers accessory dwelling units, home occupations and RV parks. In practice this means a tiny house on wheels in unincorporated Benton County is treated and reviewed as an RV placement under the zoning code's occupancy limits rather than inspected and permitted as a fixed dwelling under the building code.
Because the standard sits in the Development Code rather than the Building Code, the applicable limits (how long the unit may be occupied, which zones allow it, and any site-plan requirements) turn on the zone in question and the RV occupancy rules the county applies there.
Violations & Fines
Because § 11.100(1) bars the building official from even accepting a tiny-house-on-wheels building permit application, placing one without meeting the Chapter 91 recreational-vehicle occupancy standards is treated as an unpermitted, noncompliant land use rather than a building-code defect, subject to the county's general code compliance and civil penalty process under BCC Chapter 31, including infraction complaints and fines.
Frequently Asked Questions
Can I get a building permit for a tiny house on wheels in unincorporated Benton County?
How is a tiny house on wheels regulated instead?
What defines a 'tiny house on wheels' under Benton County's code?
Sources & Official References
Other rules in Benton County
Compare Benton County to another location·View the Oregon accessory structures overview
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