Accessory dwelling unit homes — 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
Accessory dwelling unit homes are fully functional, independent residences that share a lot with a main house. You need one of these if you are looking to increase the value of your property or accommodate changing family needs, such as adult children or elderly parents. These homes are designed to be comfortable and complete, offering all the amenities of a standard house in a smaller footprint. We specialize in designing these homes to complement your existing property and neighborhood aesthetic.
Frequently asked in Hillsboro
How do I get an ADU estimate?
What companies offer ADU services?
Companies that offer ADU services are typically licensed general contractors or specialized ADU builders with expertise in design, permitting, and construction. Look for firms with a strong understanding of local zoning laws and building codes. We provide comprehensive ADU services tailored to your needs.
What makes the best accessory dwelling unit?
The best accessory dwelling unit is one that is custom-designed to meet your specific needs, budget, and property constraints while adhering to all local building codes and zoning regulations. It should be constructed with durable materials and incorporate energy-efficient features for long-term value. We focus on tailored solutions.
Who are accessory dwelling unit companies?
Accessory dwelling unit companies are businesses specializing in the design, permitting, and construction of secondary housing units on residential properties. They possess the expertise to navigate local regulations and ensure a compliant, high-quality build. We are a leading provider of ADU services.
Who are accessory dwelling unit builders near me?
What is involved in ADU construction?
What are the specific requirements for accessory dwelling units in Massachusetts?
Accessory dwelling units in Massachusetts are regulated by state laws and local municipal bylaws, which often cover size limitations, owner occupancy rules, and parking requirements. Each town may have unique provisions. It's essential to verify your specific locality's ordinances. We can guide you through this process.
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: Downtown Hillsboro, Orenco, South Hillsboro, Brookwood, Raleighwood — and every surrounding area.
Areas we serve
Browse by state, then city.