ADU Contractors near Hillsboro, OR
JRW Construction LLC
24121 South Peach Road, Canby, OR 97013
21.5 miles
JRW Construction LLC offers full-service ADU construction, managing permits, inspections, and trade scheduling. They build detached ADUs, in-law suites, granny flats, garage conversions, and JADUs with quality finishes and energy-efficient systems... read more
Dweller Inc
Portland, OR 97204
11.9 miles
ADUs (Accessory Dwelling Units) are secondary housing units on residential properties. Popular in Oregon and California, they boost property value, generate rental income, and support multigenerational living. Financing options and local zoning ru... read more
Alta Casa
5123 Northeast 94th Avenue, Vancouver, WA 98662
19.5 miles
Alta Casa Remodeling is a Vancouver, WA ADU builder specializing in accessory dwelling units, garage conversions, in-law suites, and home additions. They also offer kitchen, bathroom, and full home remodels, backed by a one-year workmanship warran... read more
Reborn Construction LLC
29030 Southwest Town Center Loop East, Medford, OR 97070
17.2 miles
Reborn Construction LLC offers garage conversion and ADU services in Portland, OR. They handle permits, structural upgrades, and finish work for guest suites, rental units, and home offices across Portland, West Linn, Beaverton, and Gresham.
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Emmert International
11811 Southeast Highway 212, Clackamas, OR 97015
20.5 miles
With over 50 years in residential & commercial construction, house lifting, and house moving - you can rest assured that your project will be handled with insight and care. At Emmert International, we’re here to make your ADU project a succe... read more
Mighty ADU Company
2624 North Borthwick Avenue, Portland, OR 97227
12.8 miles
Mighty ADU Company is a trusted ADU contractor in Portland, OR, specializing in designing and building accessory dwelling units. They manage everything from planning and permitting to construction, ensuring quality, transparency, and stress-free r... read more
Aforma Design Studio
3617 NE 16th Ave, Portland, OR 97212
13.9 miles
Aforma Design Studio offers white-label architectural design, rendering, and preconstruction services for builders, developers, and homeowners across the US, including ADUs, renovations, and new construction, delivered under your brand.
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Jenson General Contracting
Newberg, OR 97132
15.8 miles
Jenson General Contracting builds ADUs in Newberg, Oregon, including detached units, garage conversions & in-law suites. Key rules cover size limits, height, setbacks & lot coverage. All Oregon ADUs need a bathroom, kitchen & separate ... read more
Conrad Construction LLC
5325 Northeast 109th Avenue, Portland, OR 97220
18.8 miles
Conrad Construction is Portland's trusted ADU builder with 20+ years of experience. Specializing in backyard cottages, garage conversions, granny flats & detached ADUs, they handle permits, design & construction to boost property value.read more
Roost Homes LLC
4569 NE 80th Avenue, Portland, OR
17.3 miles
Roost Homes LLC is a Portland-based contractor specializing in ADU design and build, home additions, and remodels. They offer energy-efficient detached ADUs, garage conversions, and full renovations tailored to client needs across the Portland met... read more
Collins ADU Builders
2236 NE Alberta St, Portland, OR 97211
14.4 miles
Collins ADU Builders is a licensed Portland ADU contractor offering detached ADUs, garage conversions, JADUs, home additions & design services. Free consultations, transparent pricing, full permit coordination included.
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Rain Creek Construction
8826 NE 339th St, La Center, WA 98629
29.1 miles
Accessory Dwelling Units (ADUs) add self-contained living space to existing properties. Rain Creek Construction serves Clark County homeowners with ADU builds, including garage conversions, basement apartments & detached units, backed by 10+ y... read more
Triangle Bar Group
3946 N Montana Ave, Portland, OR 97227
12.5 miles
Triangle Bar Group understands that embarking on an ADU project can feel overwhelming, especially with so many options, decisions, and different Portland ADU builders to choose from. That’s where they come in.
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Westside ADU Builders
1960 Northeast 25th Avenue, Beaverton, OR 97124
1.3 miles
Westside ADU Builders is a licensed ADU contractor in Beaverton, OR, offering detached ADUs, attached ADUs, garage conversions, JADUs, and home additions. They manage design, permits, and construction from start to finish.
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JCS Construction LLC
Colton, OR 97017
34.5 miles
JCS Construction LLC builds custom ADUs in Oregon, including detached backyard cottages, granny flats, garage conversions, basement conversions, and pole building ADUs. They handle both standard and non-traditional structures with quality craftsma... read more
Other cities in Oregon
What you need to know
ADU Contractors in Hillsboro, Oregon: Building in the Heart of Silicon Forest
Hillsboro, Oregon, is one of the fastest-growing cities in the Pacific Northwest, home to major tech employers like Intel and Nike's nearby campus. This rapid growth has created a significant demand for additional housing, making Accessory Dwelling Units (ADUs) an increasingly popular solution for homeowners. Whether you're looking to house family members, generate rental income, or increase your property value, working with experienced ADU contractors in Hillsboro, OR is essential to navigating the city's specific building requirements.
Hillsboro ADU Regulations and Zoning Requirements
Before breaking ground, it's important to understand that Hillsboro operates under Washington County's land use regulations as well as its own municipal code. ADU contractors in Hillsboro must be well-versed in these local rules to ensure a smooth permitting process. Key regulations include:
- ADUs are generally permitted in single-family residential zones (R-5, R-7, R-9, and R-15)
- Detached ADUs typically cannot exceed 800 square feet or 75% of the primary dwelling's square footage
- Attached ADUs must comply with setback requirements, typically a minimum of 5 feet from side and rear property lines
- Oregon's statewide ADU legislation (HB 2001) has further streamlined approval processes for qualifying properties
- Separate utility connections and owner-occupancy requirements may apply depending on the property type
Types of ADUs Built by Hillsboro Contractors
Experienced ADU builders in Hillsboro, Oregon can construct several types of accessory dwelling units tailored to your property and budget. The most common options include:
- Detached ADUs: Standalone structures built in the backyard, offering maximum privacy for both occupants
- Attached ADUs: Units connected to the primary home, often more cost-effective to build
- Garage Conversions: Transforming existing garages into livable spaces, a popular option in established Hillsboro neighborhoods
- Basement Conversions: Utilizing existing below-grade space to create a separate living unit
Why Hire a Local ADU Contractor in Hillsboro?
Hiring a local ADU contractor in Hillsboro, OR offers distinct advantages over working with out-of-area builders. Local contractors have established relationships with the City of Hillsboro's Community Development Department, understand Washington County's permitting timelines, and are familiar with regional building materials suited to the Pacific Northwest's rainy climate. They can also help you take advantage of Oregon's SDC (System Development Charge) exemptions, which can significantly reduce upfront construction costs for qualifying ADU projects.
Start Your Hillsboro ADU Project Today
With Hillsboro's housing market continuing to grow alongside its thriving tech economy, now is an excellent time to invest in an ADU. Partnering with a qualified, licensed ADU contractor in Hillsboro, Oregon ensures your project meets all local codes, stays on budget, and delivers lasting value to your property. Request multiple quotes, verify contractor licenses through the Oregon Construction Contractors Board (CCB), and review past project portfolios before making your decision.