Adu services — 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 services simplify the complex process of turning unused yard space into a functional, independent living unit. This involves architectural drafting, structural engineering, and managing municipal building departments to secure necessary approvals. You should look for these services when you are ready to expand your home’s footprint for rental income, guest accommodations, or multi-generational living. Engaging experts ensures the project stays compliant with state codes while meeting your specific design goals for a secondary dwelling.
Frequently asked in Hillsboro
What are accessory dwelling units (ADUs) in Hillsboro?
What is the cost of an accessory dwelling unit in Hillsboro?
Where can I find accessory dwelling unit builders in Hillsboro?
What is the process for an ADU quote in Hillsboro?
What are the best ADUs for Hillsboro properties?
What are the permit costs for an accessory dwelling unit in Hillsboro?
What is the process for ADU building in Hillsboro?
The ADU building process in Hillsboro typically begins with design consultation and obtaining necessary permits, followed by site preparation and foundation construction. Subsequent stages include framing, exterior finishing, and interior rough-ins for plumbing, electrical, and HVAC systems. Inspections are conducted at various milestones to ensure code compliance. We work with builders who manage each phase efficiently. Your ADU will be built to high standards.
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: The (), Orenco Station, Downtown Hillsboro, Brookwood, Walnut Creek — and every surrounding area.
Areas we serve
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