ADU Design in Wasco, OR

ADU Design in Oregon: what governs your project

Oregon's HB 2001 (2019), following 2017's SB 1051, requires cities of 10,000 or more to allow at least one ADU on any lot where a single-family home is permitted. The law bars cities from imposing owner-occupancy requirements or off-street parking mandates beyond what the primary home requires.

Energy code

System development charges for ADUs are capped by state law at a proportional share of the primary home's charges. Local building departments process ADUs through standard residential permits with predictable timelines in Portland, Eugene, Salem, and other covered cities.

Permitting & plan check

Portland's Bureau of Development Services runs a well-established electronic plan review process; other large cities like Eugene, Salem, and Bend operate their own portals. Many smaller cities and counties rely on third-party review agencies. Land-use approvals often run on a separate track from building permits in Oregon jurisdictions.

Good to know

• Western Oregon is in Seismic Design Category D due to the Cascadia subduction zone.
• Oregon DEQ's 1200-C permit covers construction stormwater statewide.
• Portland administers development review through its Bureau of Development Services.

Every discipline, one team