ADU Builders & Contractors in Washington

We specialize in designing, permitting, and constructing high-quality ADUs that align with Bellingham’s 2023 zoning updates and Washington State’s HB 1337 regulations. Our team ensures a seamless process from concept to completion.

As your Seattle home remodeling experts, we create tailored ADU designs—perfect for generating rental income or offering a comfortable space for a loved one.

Cornerstone has been a Sequim ADU (accessory dwelling unit) builder serving Washington State’s beautiful North Olympic Peninsula over 40 years. As a design-build firm we manage every step of the ADU design and build so you can enjoy the process start to finish.

Veteran-owned and operated, serving Western Washington with quality construction and remodeling services. Building dreams, one home at a time.

DIGS specializes in ADU and DADU construction in Seattle and the surrounding area with custom designs, quality craftsmanship, and local expertise. At DIGS, we believe in the power of possibility and are excited to start this building journey with you.

Evola Builds is your premier general contractor for ADU construction in Kitsap County, WA. We specialize in designing and building beautiful, functional, and compliant Accessory Dwelling Units (ADUs).

We specialize in creating beautiful and functional ADUs and garage conversions that exceed expectations. Our ADU builders in Spokane will work with you to create an ideal living space that fits your style and budget.

New Day Construction specializes in designing and building ADUs that maximize your living space, generate rental income, and increase your property’s value. They are a full-service remodeling expert in Bellevue.

At Puget Sound ADU Builders, we create functional and cozy ADUs (Accessory Dwelling Units) in Washington. Our company was founded by Tanya Mills and built on a passion for providing high-quality, affordable housing solutions that unite families.

Emerald ADU Builders Seattle is your favorite contractor when it comes to the design and building of the ADUs. You may have come across a prefab ADU Seattle going by different names like in-law units, granny flats, sidekick homes, backyard guest houses, and laneway homes among others.