ADU Contractors near Hillsboro, OR
Shelter Solutions ADU Builders
502 7th Street, Oregon City, OR 97045
19.9 miles
Shelter Solutions is Portland's trusted ADU contractor since 1997, with 250+ completed projects. Specializing in detached ADUs, backyard cottages & in-law suites, they offer full design-build services, permit handling & expert guidance throughout Oregon.
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Harka Architecture
7631 Northeast Glisan Street, Portland, OR 97213
17 miles
Harka offers ADU design, consulting, and permitting services with 18+ years of experience. Services include feasibility reports from $785, zoning review, schematic design, construction documents, and energy modeling to reduce costs and carbon footprint.
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Keyser Construction Inc
452 SW Alderwood Dr, West Linn, OR 97068
17.4 miles
Keyser Construction Inc is a Portland, OR ADU contractor since 1996. They build detached cottages, garage conversions, basement & attic ADUs. Licensed, bonded & insured, offering free estimates and permit handling across the Portland metro area.
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Adair Homes
4400 Northeast 77th Avenue, Vancouver, WA 98662
18.7 miles
Adair Homes offers custom ADU builder solutions, including stand-alone and attached accessory dwelling units. With a six-step building process, financing via Basis Home Loans, and expert guidance, Adair simplifies new home and ADU construction.
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Triangle Bar Group
Gresham, OR 97227
24.4 miles
Triangle Bar Group is a Portland, Oregon design-build contractor specializing in custom homes, additions, remodels, and ADUs. They manage design, permitting, and construction under one roof, serving Portland and Vancouver, WA homeowners.
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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.