Portland ADU Builders
Portland helped invent the modern ADU movement. SDC waivers and state law make ADUs straightforward to permit, and local firms handle everything from backyard cottages to basement conversions and structural work.
3 builders based in the Portland area
Cost basics
Detached ADU projects commonly run $150,000–$400,000+ depending on size and finishes; garage conversions cost less. Builders focused on the Portland area can give project-specific pricing — several publish real example budgets on their profiles.
Permit basics
State law requires by-right approval of compliant ADUs in most cases, but local rules (setbacks, height, parking, historic districts) vary. Confirm requirements with your city's planning department before finalizing a design — or ask a local design-build firm, which handles permitting as part of the project.