Accessory Structures in Tigard, OR (2026)
4 verified accessory structures rules for Tigard, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Tigard allows accessory dwelling units under Chapter 18.220 (Accessory Dwelling Units) of the Tigard Community Development Code, with a maximum size of 800 square feet, a maximum height of 25 feet for a detached ADU, one detached ADU per lot, and no city-imposed owner-occupancy or additional off-street parking requirement. The framework implements Oregon's statewide ADU mandate under SB 1051 (2017) and HB 2001 (2019).
ADU Rules in Tigard
Few RestrictionsShed Rules
Tigard treats sheds as detached residential accessory structures under the Tigard Community Development Code. Under CDC Chapter 18.290 (Small Form Residential), accessory structures may not be located in the required front-yard setback and must maintain at least a 5-foot setback from side, street side, and rear property lines. Accessory structures may not exceed 528 square feet on lots smaller than 2.5 acres and may not cause the lot to exceed the base-zone lot-coverage maximum.
Shed Rules in Tigard
Some RestrictionsGarage Conversions
Tigard allows existing detached garages and other accessory structures to be converted into accessory dwelling units under Tigard Community Development Code Chapter 18.220 (Accessory Dwelling Units), subject to the 800-square-foot size cap, 25-foot height cap, and small form residential setback and lot-coverage rules in Chapter 18.290. Conversions to general habitable space follow the Oregon Residential Specialty Code adopted under ORS 455.020 and require building, electrical, plumbing, and mechanical permits from the Tigard Building Division.
Garage Conversions in Tigard
Few RestrictionsCarport Rules
Tigard treats carports as residential accessory structures under the Tigard Community Development Code. Detached accessory structures must maintain a minimum 5-foot setback from side, street side, and rear property lines, with garage and carport vehicle-entry setbacks measured from the door elevation under the standards in Chapter 18.290 (Small Form Residential) Table 18.290.1. Building permits follow the Oregon Residential Specialty Code adopted under ORS 455.020.
Carport Rules in Tigard
Some RestrictionsLooking for Washington County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Tigard city rules.
Accessory Structures in Washington County →