Accessory dwelling unit builders near me — 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
Local builders specialize in the specific zoning codes and climate considerations of your region. Searching for builders in your area is the right step when you are ready to break ground and need a team that understands local geography, utility access, and neighborhood aesthetic requirements. These professionals handle the physical assembly of the structure, ensuring it meets all safety and energy standards required by your specific city or county government. Exact pricing confirmed free on the call.
Frequently asked in Hillsboro
What are the best ADU services in Hillsboro?
What is ADU construction in Hillsboro?
What is an accessory dwelling unit (ADU)?
What is a modular accessory dwelling unit?
A modular accessory dwelling unit is a type of ADU where the majority of the structure is prefabricated in a factory setting and then transported to the building site in Hillsboro for assembly. These units are built to specific building codes and standards, often allowing for faster on-site construction times. While customization options might differ from fully custom builds, they offer a controlled construction environment. We can assess their suitability.
What's the cost of an accessory dwelling unit in Massachusetts?
The cost of an accessory dwelling unit in Massachusetts can vary significantly based on factors like the unit's size, design complexity, materials used, and local labor rates. Permitting fees, site preparation, and connection to utilities also contribute to the overall expense. It is recommended to consult with local Massachusetts ADU builders for specific pricing tailored to your project and location within the state. Our focus is on Hillsboro.
What is involved in ADU building in Hillsboro?
What kind of backyard accessory dwelling unit can be built in Hillsboro?
In Hillsboro, a backyard accessory dwelling unit (ADU) can be a detached structure, such as a small cottage or studio, built on your property. Its construction must comply with Hillsboro's zoning ordinances regarding setbacks from property lines, lot coverage, and height restrictions. Proper planning for utility connections and access is also essential. We ensure your backyard ADU meets all city requirements.
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: AmberGlen, Raleighwood, Westwick, The Reserve at Hillsboro, South Hillsboro — and every surrounding area.
Areas we serve
Browse by state, then city.