Accessory Structures in Beaverton, OR (2026)
4 verified accessory structures rules for Beaverton, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Beaverton allows one ADU per detached dwelling unit in all residential zones under Development Code Chapters 40 and 60. Detached ADUs are limited to 800 sq ft; attached ADUs cannot exceed 50% of primary dwelling or 800 sq ft. Detached ADU height limit is generally 16 feet. No owner-occupancy requirement. No parking minimum near transit per state law.
Beaverton ADU / Accessory Dwelling Unit Rules
Some RestrictionsShed Rules
Sheds and detached accessory structures in Beaverton are regulated by the Beaverton Development Code Chapter 60 (Section 60.50, Residential Accessory Structures) and the Oregon Residential Specialty Code adopted under BC Chapter 8.02. One-story detached accessory structures of 200 square feet or less are generally exempt from a building permit under the Oregon Residential Specialty Code, but they must still comply with the setbacks of the underlying residential zone (BDC Chapter 20). Sheds cannot be used as habitable dwelling units unless converted into an ADU with full permitting.
Beaverton Shed Rules: Permits and Setbacks
Some RestrictionsGarage Conversions
Garage conversions to ADUs are permitted in Beaverton. Existing legal non-conforming structures can be converted to ADUs provided the conversion does not increase the non-conformity. Building, mechanical, plumbing, and electrical permits are required. The converted unit must have a separate exterior entrance and meet all ADU standards.
Beaverton Garage Conversion Rules
Some RestrictionsCarport Rules
Beaverton regulates carports as residential accessory structures under the Beaverton Development Code Chapter 60 (Special Requirements), Section 60.50 (Accessory Dwelling Units and Residential Accessory Structures). Carports must meet the same yard setbacks as the principal dwelling under the underlying residential zone in BDC Chapter 20, and garage door or vehicle-entry setbacks are measured from the door elevation to the property line. Building permits are administered under BMC Chapter 8.02, which adopts the Oregon Residential Specialty Code.
Beaverton Carport Rules: Accessory Structure Setbacks
Some RestrictionsLooking for Washington County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Beaverton city rules.
Accessory Structures in Washington County →