SQFT Studios, founded in 2015, is Portland's leading ADU design-build firm. Specializing in detached ADUs, garage conversions & backyard cottages, they deliver Earth Advantage Platinum-certified, sustainable builds tailored to every homeowner.
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Cronen Building Co. is an expert ADU builder specializing in granny flats, garage conversions, backyard cottages, and detached ADUs. They deliver custom accessory dwelling units that boost property value and functionality.
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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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The Powell Group is a Portland-area custom home and ADU builder led by Mitch Powell, with 20+ years of experience. They've completed 500+ homes and 30+ ADU projects, offering expert construction from planning to completion.
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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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As a premier ADU contractor in Portland, Sert Construction specializes in designing and building high-quality, functional ADUs. Whether you're considering an added space for rental income, additional family space, or a home office, their team of experienced ADU builders ensures a seamless integration of these units into your existing property.
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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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Lamont Bros. Design & Construction is a Portland, Oregon ADU contractor offering full design-build services. They help homeowners plan and build accessory dwelling units, including detached ADUs, garage conversions, and JADUs for rental income or flexible living.
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Accessory Dwelling Units are a great way for Mississippi Avenue homeowners to make the most of their property. Whether you need extra space for family, a home office, or a way to generate rental income, our team at Home Services Plus handles everything—from permits to finishing touches.
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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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JAM Concept Remodeling is a Portland ADU contractor with 25+ years of experience in basement conversions, garage conversions, home additions, and residential remodeling, helping homeowners add functional living space and long-term property value.
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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 rules apply.
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Integrity Timber Frame offers custom prefabricated timber frame home, cabin, and ADU kits in South Dakota. Using their TruFit™ System and SIPs panels, they deliver strong, energy-efficient, sustainable structures with faster assembly and potential cost savings.
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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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TaylorSmith Sustainable Construction is a Portland, Oregon contractor specializing in sustainable new homes, renovations, energy retrofits, and ADU construction. All new builds target DOE Net Zero Energy Ready certification.
read moreColton is a small, unincorporated rural community located in Clackamas County, Oregon. Unlike incorporated cities, Colton falls under the jurisdiction of Clackamas County's land use and zoning regulations, which significantly shapes how ADU (Accessory Dwelling Unit) contractors operate in this area. The rural character of Colton, surrounded by forests and farmland, means that ADU projects here often involve unique site considerations such as well water systems, septic systems, and larger lot sizes — all of which experienced local ADU contractors must be well-versed in handling.
Since Colton is an unincorporated community, ADU permits and approvals are governed by Clackamas County rather than a city planning department. Oregon state law, particularly House Bill 2001 and subsequent legislation, has expanded ADU allowances statewide, but county-specific rules still apply. In rural residential zones common to the Colton area, ADU contractors must navigate regulations including:
Skilled ADU contractors serving Colton, OR understand that rural builds come with distinct challenges compared to urban or suburban projects. These professionals are experienced in site preparation on sloped or wooded terrain, coordinating with Clackamas County's building department for permits, and working with subcontractors who specialize in rural utilities. Whether you are looking to build a detached ADU, an attached ADU, or convert an existing structure such as a barn or garage into a livable unit, local contractors can guide you through every step of the process.
Adding an ADU to a Colton property offers several practical advantages for rural homeowners:
When planning an ADU in Colton, it is essential to work with licensed and insured ADU contractors who have direct experience with Clackamas County's permitting process and rural construction requirements. Choosing a contractor familiar with the specific demands of unincorporated Oregon communities will save time, reduce costs, and ensure your project meets all local and state building codes from start to finish.