Adu estimate — 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
An ADU estimate is a preliminary assessment used to give you a rough idea of what your project might cost before you commit to a full design plan. This is helpful when you are in the early research phase and trying to determine if your budget aligns with your vision. Because site preparation and permit fees vary, your final cost will depend on these specifics. We provide these figures to help you plan your finances. Exact pricing confirmed free on the call.
Frequently asked in Hillsboro
What accessory dwelling unit services are available in Hillsboro?
Accessory dwelling unit services in Hillsboro encompass the full spectrum of ADU development, from initial design consultation and architectural drawings to navigating the complex permitting process with the city. This includes site analysis, foundation construction, framing, utility installations (plumbing, electrical, HVAC), interior and exterior finishing, and final inspections. We provide comprehensive services to ensure your ADU is built to code.
What is involved in accessory dwelling unit construction in Hillsboro?
Accessory dwelling unit construction in Hillsboro involves detailed planning, obtaining permits from the city, site preparation including excavation and foundation work, framing the structure, installing all mechanical, electrical, and plumbing systems, and completing interior and exterior finishes. Each phase must adhere to precise building codes and safety standards, including seismic considerations. We manage this process.
What ADU services can I get in Hillsboro?
What are the best accessory dwelling unit builders in Hillsboro?
What is the accessory dwelling unit construction cost in Hillsboro?
The accessory dwelling unit construction cost in Hillsboro is influenced by factors such as the unit's size, the complexity of its design, and the quality of materials selected. Site preparation, foundation type, and the extension of utilities are significant cost components. We provide detailed quotes based on your specific project requirements. Call us for an estimate.
What about prefab ADUs in Hillsboro?
Where can I find accessory dwelling unit builders near me 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: Raleighwood, South Hillsboro, Brookwood, North Hillsboro, Glencoe — and every surrounding area.
Areas we serve
Browse by state, then city.