ADU Locator

1 Best ADU Builders in Hillsboro, Oregon

Verified ADU contractors and builders in Hillsboro, OR

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HILLSBORO ADU BUILDERS

Specializing in accessory dwelling unit construction throughout Hillsboro, we help homeowners add valuable living space to their properties with expert design and quality craftsmanship. From new ADU builds to backyard conversions, we manage every phase of your project with professional attention to detail and local building code compliance.

+1 866-327-6017
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Frequently Asked Questions — ADU Builders in Hillsboro

How much does it cost to hire an ADU builder in Hillsboro?

ADU construction costs in Hillsboro, Oregon vary widely depending on size, type, and site conditions. Detached ADUs typically range from $150,000–$400,000+, while garage conversions and attached ADUs can be more affordable. Contact multiple builders in Hillsboro to get accurate quotes for your specific project.

How long does it take to build an ADU in Hillsboro?

In Hillsboro, the ADU construction timeline typically ranges from 6 to 18 months from permit application to move-in. Permitting alone can take 2–6 months depending on Oregon local regulations. Prefab and modular ADUs often have faster timelines than site-built units.

Do I need a permit to build an ADU in Hillsboro?

Yes, a building permit is required for ADU construction in Hillsboro, Oregon. Your ADU builder will typically handle the permit application as part of their service. Oregon has adopted streamlined ADU permitting laws in recent years, which may reduce wait times.

What types of ADUs can be built in Hillsboro?

Common ADU types in Hillsboro include detached ADUs (backyard cottages), attached ADUs, garage conversions, basement conversions, and prefab/modular ADUs. The best type for your property depends on lot size, zoning, and budget. A local Hillsboro ADU builder can advise on what's allowed on your specific parcel.