Adu housing — Hillsboro, OR
Last updated: September 24, 2026
What affects the price
Building an ADU is a custom project, so costs vary based on your specific choices. Site conditions are the biggest factor; if your land requires significant grading, utility extensions, or foundation work, those expenses add up quickly. Choosing high-end finishes, custom cabinetry, or complex roof lines will also push the budget higher compared to a standard design. Prefabricated units often offer predictable costs, while custom site-built structures allow for more flexibility but can be harder to estimate upfront. Exact pricing confirmed free on the call.
About this service
ADU housing refers to the creation of independent living units on the same lot as a primary residence. You might need this if you want to provide a private space for guests, generate rental income, or create a flexible home office. These units include their own kitchen, bathroom, and entrance. Whether you are looking for a detached cottage or a garage conversion, we help you navigate the process of adding functional, long-term living space to your existing property.
Frequently asked in Hillsboro
What is involved in ADU construction in Hillsboro?
What are the services offered by an ADU company in Hillsboro?
Are there affordable accessory dwelling unit options in Hillsboro?
What are homes with mother-in-law suites like in Hillsboro?
Homes with mother-in-law suites in Hillsboro, Oregon, feature a self-contained living space, either attached to or detached from the primary residence. These suites typically include a bedroom, bathroom, and a kitchenette or full kitchen, offering independent living accommodations. They are designed to provide privacy and convenience for extended family members or as rental units. The construction and permitting of these suites must comply with Oregon's building codes and Hillsboro's specific zoning regulations, ensuring they are safe, functional, and legally established additions.
What is an emergency ADU service in Hillsboro?
What is a backyard accessory dwelling unit in Hillsboro?
What ADU construction services are available in Hillsboro?
Also serving nearby: Beaverton · Portland · Vancouver · Gresham · Salem
More on this: HUD ADU resources — ADU policy and financing research.
Service area details
Serving all of Hillsboro — population 107,730; about 4,168 residents per square mile across 25.8 sq mi. ZIP codes covered include 97123, 97124, 97129.
Neighborhoods served in Hillsboro: Orenco Station, Brookwood, Downtown Hillsboro, South Hillsboro, Glencoe — and every surrounding area.
Areas we serve
Browse by state, then city.