19 Best ADU Builders in Portland, Oregon

Verified ADU contractors and builders in Portland, OR

Showing 119 of 19 listings

ADU PDX

Specializing in accessory dwelling unit construction throughout Portland, we help homeowners add valuable living space to their properties with expert design and quality craftsmanship. From new builds to conversions, our team handles every aspect of bringing your ADU project to completion.

+1 503-335-9040
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Arciform

Transform your underutilized garage into a functional living space with expert conversion services in Portland. Our specialized team handles every aspect of garage-to-living-space projects, from structural modifications and permits to finishing touches that seamlessly integrate with your home.

+1 503-493-7344
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Birdsmouth Design-Build

Specialized ADU contractor serving Portland homeowners looking to add accessory dwelling units to their properties, from initial design through final construction. Brings expert knowledge of local building codes and zoning requirements to maximize your project's potential.

+1 503-753-9692
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Catalyst Construction & Kitchen Remodeling

Expert garage-to-living-space conversions in Portland that transform underutilized spaces into functional rooms for your home. From design through completion, we specialize in creating seamless additions that maximize your property's potential.

+1 503-914-9146
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Hammer & Hand

Hammer & Hand is a construction company specializing in residential and commercial projects, with a focus on high-performance building and custom woodshop services.

(503) 232-2447
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J.A.M Concept Remodeling LLC

Specializing in ADU construction and conversions throughout the Portland area, this contractor transforms underutilized spaces into fully functional accessory dwelling units for homeowners seeking to maximize their property's potential. With expertise in building codes and design optimization, they deliver custom ADU solutions tailored to each client's needs and budget.

+1 503-490-5541
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Neil Kelly

Neil Kelly is a design/build remodeling company serving the Northwest since 1947. They offer custom ADU design and construction services, bringing expertise, craftsmanship, and environmental awareness to remodeling and custom homebuilding.

(866) 691-2719
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Orange Splot

A housing development company and general contractor specializing in community-oriented, affordable, and green housing projects including multi-unit developments and townhomes in Portland and beyond.

+1 503-422-2607
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Peton Construction LLC

Specializing in garage-to-living-space conversions throughout the Portland area, we transform underutilized garages into functional rooms tailored to your home's needs. Our expert team handles everything from design and permitting to construction and finishing touches, ensuring your new space seamlessly integrates with your existing home.

+1 503-389-8899
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PORTLAND ADU

Unlock the full potential of your home by adding additional living space. We also specialize in remodeling basements, bathrooms, kitchens and bonus spaces so that you can turn your dream home into a reality.

(503) 756-2813
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Portland ADU / Jason Allen Contracting, LLC

Specializing in accessory dwelling unit (ADU) construction throughout the Portland area, this contractor transforms properties with expert planning and quality craftsmanship to create additional living spaces that maximize your home's potential. From initial design through final completion, they deliver comprehensive ADU services tailored to local building codes and your family's unique needs.

+1 503-756-2813
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Portland ADU Builders

We specialize in building accessory dwelling units throughout Portland, helping homeowners add rental income or guest space to their properties with expert design and construction. From permits to completion, we handle every aspect of your ADU project with quality craftsmanship and local expertise.

+1 503-966-2500
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Portland ADU Contractor

Specializing in accessory dwelling unit construction and conversions throughout the Portland area, this contractor helps homeowners maximize their property value by building new ADUs or transforming existing structures into livable rental units. With expertise in local zoning requirements and permitting processes, they deliver quality ADU projects tailored to your home and budget.

+1 971-297-1558
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PortlandADU.com

Portland's premier resource for everything related to Accessory Dwelling Units. Powered by GatherADU, we bring together top architects, contractors, and ADU specialists under one roof.

(323) 591-3717
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Propel Studio

Transform your Portland property with a custom ADU designed and built to maximize your space and investment. From initial concept through completion, we specialize in creating accessory dwelling units tailored to your family's needs and your home's unique architecture.

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Relevant Buildings

From container homes to wood-framed homes, we\'re your local ADU builder. Our goal is to make your home building journey as easy as possible. From financing help, design, permitting, and building, we provide everything you’ll need to make your ADU dream a reality.

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Shelter Solutions

At Shelter Solutions, we use a streamlined ADU Design-Build model and 28 years of expertise that merge every stage of your project under one roof. By focusing on both Portland ADU design and construction, you benefit from minimized delays, lower expenses, and top-tier craftsmanship.

(971) 359-3731
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The Powell Group

The Powell Group is a hands-on homebuilding company that specializes in the construction of custom homes and Accessory Dwelling Units (ADUs) in the greater Portland metropolitan area. They help guide you through each step of the homebuilding process and ensure customers have a positive experience and a home that will last.

(503) 919-0314
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True Built Home

True Built Home stands out with a strong record of delivering functional, stylish ADUs. They focus on working closely with you throughout the entire project, from initial sketches to finishing touches.

(855) 949-8783
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Frequently Asked Questions — ADU Builders in Portland

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

ADU construction costs in Portland, 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 Portland to get accurate quotes for your specific project.

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

In Portland, 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 Portland?

Yes, a building permit is required for ADU construction in Portland, 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 Portland?

Common ADU types in Portland 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 Portland ADU builder can advise on what's allowed on your specific parcel.