Homes with mother in law suites — 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
These homes include a dedicated living area for family members, often equipped with a private bathroom or small kitchenette. You need this if you want to keep family close while respecting everyone’s need for personal space. The cost of adding this to your home is typically driven by your plumbing needs, electrical requirements, and the scale of the interior renovation. Exact pricing confirmed free on the call.
Frequently asked in Hillsboro
What is the cost to build an ADU in Hillsboro?
The cost to build an ADU in Hillsboro depends on factors like size, design complexity, material choices, and site preparation needs. Utility connections and permit fees also contribute to the overall expense. We provide detailed, no-obligation quotes after a thorough site evaluation. Accurate budgeting starts with a precise estimate.
What are the financing options for ADUs in Hillsboro?
Financing options for ADUs in Hillsboro can include home equity lines of credit, personal loans, or specific construction loans. Exploring these avenues early can help manage project costs. We can discuss potential pathways during your consultation. Securing financing is a key step in the ADU process.
What is the cost of an accessory dwelling unit in Hillsboro?
The cost of an accessory dwelling unit in Hillsboro is influenced by its dimensions, the quality of materials selected, and the complexity of the construction. Site conditions, such as foundation requirements and utility hookups, also play a significant role. We offer free, detailed estimates after a site assessment. This ensures you have accurate cost information.
Are prefabricated ADUs a good option for Hillsboro properties?
Prefabricated ADUs can be a suitable option for Hillsboro properties, potentially offering faster construction timelines and predictable costs. However, careful site preparation and foundation work are still essential. We can help assess if a prefab ADU aligns with your project goals and property. Consider all build types for the best fit.
Where can I find an accessory dwelling unit contractor in Hillsboro?
What are accessory dwelling unit homes?
Accessory dwelling unit homes are properties that include a secondary, independent living unit in addition to the primary residence. These units can serve various purposes, such as housing extended family or generating rental income. We specialize in creating these valuable additions. They significantly enhance property utility and value.
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: North Hillsboro, South Hillsboro, Downtown Hillsboro, Brookwood, Orenco Station, Walnut Creek — and every surrounding area.
Areas we serve
Browse by state, then city.