Accessory Structures in Beaverton, OR (2026)
5 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 accessory dwelling unit per single-detached home through a staff-level Type 1 permit, capped at 800 square feet unless it converts existing floor area.
Beaverton ADU Permit and Size Rules
Some RestrictionsBeaverton Development Code § 60.50.03
A. An accessory dwelling unit is permitted only in conjunction with a single-detached dwelling. ... C. Size 1. Accessory dwelling units shall not exceed 800 square feet in floor area, except as provided in subsection 2. 2. Accessory dwelling units that result from the conversion of a level or floor of the primary dwelling are not subject to the size limitations in Section 60.50.03.2.C.1 and may...
ADU Owner Occupancy
A recorded Beaverton HOA covenant or CC&R cannot require an accessory dwelling unit to be owner-occupied. Development Code § 10.18.4 makes every such recorded instrument print a notice that any clause doing so is unenforceable.
Beaverton ADUs: No Owner-Occupancy Rule
Few RestrictionsBeaverton Development Code § 10.18.4
All recorded instruments that create a homeowners association, or include covenants, conditions, or restrictions for real property zoned for residential use, shall include the following statement in all capital letters on the first page of the recorded instrument: THIS PROPERTY IS SUBJECT TO SECTION 13, CHAPTER 639, OREGON LAWS 2019, AND ANY RECORDED DOCUMENT F...
Shed & Carport Rules
Beaverton caps combined accessory-structure footprint at 500 square feet on lots up to 10,000 square feet (700 on larger lots), limits height to 15 feet and one story, with 3- to 5-foot setbacks.
Beaverton Shed Size and Setback Rules
Some RestrictionsBeaverton Development Code § 60.50.05
For lots ten thousand (10,000) square feet or less, the combined footprint of all accessory structures may not exceed five hundred (500) square feet. For lots greater than ten thousand (10,000) square feet, the combined footprint may not exceed seven hundred (700) square feet. ... Accessory structures shall not exceed one story and shall be no greater than fifteen (15) feet in height. ... A str...
Garage Conversions
Converting a garage into an accessory dwelling unit is allowed in Beaverton, but unlike a basement or attic conversion it still counts toward the 800-square-foot ADU size cap.
Beaverton Garage-to-ADU Conversion Rule
Some RestrictionsBeaverton Development Code § 60.50.03.2.B.1
An accessory dwelling unit may be created in the following manner: 1. Conversion of existing living area, attic, basement or garage; [ORD 4782; April 2020] 2. Adding floor area to the primary structure or to an accessory structure, subject to the limitations of the zoning district in which it is located; [ORD 4822; June 2022] 3. ...
Tiny Homes
Beaverton has not adopted Appendix Q's special tiny-house standards, so a tiny house here must meet the same full Residential Specialty Code requirements as any other dwelling.
Beaverton Tiny House Code Standard
Significant RestrictionsBC 8.02.160
R101.2.3.2 Matters preempted by the state building code. The following matters are not adopted, are preempted by the state building code and may not be adopted by a local municipality: 1. Appendix A (Sizing and Capacities of Gas Piping). 2. Appendix B (Sizing of Venting Systems Serving Appliances Equipped with Draft Hoods, Category I Appliances, and Appliances listed for use with Type B Vents...
Looking for Washington County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Beaverton city rules.
Accessory Structures in Washington County →