Tiny home rules in Hillsboro, 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.
Washington County allows foundation-built tiny homes as dwellings or ADUs under CDC 430-89 (ADU) and ORS 197.312(5). Tiny homes on wheels are regulated as RVs or park model homes and cannot be occupied as permanent dwellings on residential lots.
Oregon is a national leader on tiny homes. Tiny houses on permanent foundations under 400 sq ft are built to IRC Appendix Q (adopted as Appendix AQ in Oregon ORSC). They can serve as a primary dwelling, ADU, or detached unit. Washington County allows one ADU per single-family lot in urban unincorporated areas under CDC 430-89, implementing ORS 197.312(5) and HB 2001 (2019): no owner occupancy requirement, no off-street parking requirement. ADU size generally limited to 800 sq ft or 60% of primary dwelling. Tiny homes on wheels (THOW) are regulated as RVs under ORS 446.003 and cannot be occupied as a permanent dwelling on a residential lot except in licensed RV parks. Park model RVs (ANSI A119.5) face similar limits. Hillsboro, Beaverton, and Tigard all allow foundation ADUs under parallel HB 2001 ordinances.
Occupying a THOW as permanent residence: zoning violation, code compliance order. Unpermitted ADU construction: stop-work, retroactive permit, possible removal. Short-term rental use of ADU may trigger additional restrictions.
Hillsboro, OR
Hillsboro Municipal Code Subchapter 6.24 prohibits unauthorized, disturbing, or unnecessary noise. Noise levels are especially enforced between 9 PM and 6 AM...
Hillsboro, OR
Hillsboro addresses barking dogs through its noise ordinance and animal control. Persistent barking is a nuisance violation. Washington County Animal Service...
Hillsboro, OR
Hillsboro permits construction, industrial, and agricultural noise between 6 AM and 9 PM per Subchapter 6.24. Construction outside these hours is prohibited ...
Hillsboro, OR
Vehicles in Hillsboro driveways must not block sidewalks. Driveway modifications require permits from the city's permitting center.
Hillsboro, OR
Hillsboro restricts RV and boat parking on streets and in residential front yards. RVs may not be used as dwellings on residential property.
Hillsboro, OR
Hillsboro regulates on-street parking. Vehicles must be registered and operable. Vehicles may not remain in the same location for more than 72 hours without ...
See how Hillsboro's tiny homes rules stack up against other locations.
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