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Accessory dwelling unit companies — Hillsboro, OR

Looking for accessory dwelling unit companies in Hillsboro, OR? Call AccessoryDwellingUnit Pros for a contact a provider — no obligation. Licensed adu builders serve Hillsboro and the surrounding area, and you'll get straight answers on timing and what affects the price.

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

Frequently asked in Hillsboro

What accessory dwelling unit contractor services are available in Hillsboro?

Accessory dwelling unit contractor services in Hillsboro encompass the entire construction process, from initial design and permitting to final build-out. Professionals manage site assessments, architectural planning, and ensure compliance with Hillsboro's specific zoning ordinances and building codes. This includes foundation work, framing, utility installations, and interior/exterior finishing. Whether you need a detached unit or an attached addition, these services provide the expertise for a high-quality, code-compliant ADU. Comprehensive project management is provided.

What are the requirements for a detached accessory dwelling unit in Hillsboro?

Requirements for a detached accessory dwelling unit in Hillsboro typically involve adhering to specific zoning ordinances regarding size, height, and lot coverage. Setback requirements from property lines and existing structures are also critical. Professionals will ensure the design meets all local building codes and permit stipulations. Utility connections for water, sewer, and electricity must be addressed. The city of Hillsboro has specific guidelines for these structures. Compliance with city regulations is mandatory.

How can I get an ADU quote in Hillsboro?
What is an accessory dwelling unit near me in Hillsboro?
What are homes with mother-in-law suites like in Hillsboro?

Homes with mother-in-law suites in Hillsboro feature a separate, self-contained living space attached to or within the main residence. These suites typically include a bedroom, bathroom, and often a kitchenette or small kitchen. They provide independent living quarters for elderly parents, adult children, or guests. Professionals can help design and build these suites to meet specific needs and comply with Hillsboro's building codes. They offer privacy and convenience for occupants.

Are there accessory dwelling unit grants available in Hillsboro?

Information on accessory dwelling unit grants specifically for Hillsboro can be limited and may change. It is advisable to research current local and state programs that might offer financial assistance for ADU construction. Pros can sometimes provide guidance on potential funding avenues. Checking with the city of Hillsboro's planning department or housing authorities is also recommended for the most up-to-date information on available grants or incentives. Researching current programs is essential.

What is the cost to build an accessory dwelling unit in Hillsboro?

The cost to build an accessory dwelling unit in Hillsboro varies based on its size, design complexity, materials chosen, and site preparation needs. Permit fees and utility connection costs are also significant factors. It is crucial to obtain detailed quotes from experienced ADU professionals in Hillsboro for an accurate estimate tailored to your specific project. Understanding these variables is key to effective budgeting. Accurate estimates are vital for planning.

Also serving nearby: Beaverton · Portland · Vancouver · Gresham · Salem

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More on this: HUD ADU resources — ADU policy and financing research.

Service area details

107,730residents
4,168per sq mile
3ZIP codes served

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 Station, Glencoe, Raleigh Hills, Merlo — and every surrounding area.

Areas we serve

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