Thinking about adding an accessory dwelling unit to your property? ADU construction is one of the smartest ways to add living space, rental income, or multigenerational flexibility to your home. As experienced ADU builders in the Greater Eastside & Snohomish County, ARK Contractors handles every phase — from ADU design and permitting through construction and final inspection. We build detached ADUs, attached ADUs, and garage conversion ADUs, and we’re deeply familiar with local zoning and building codes. Whether you need a backyard cottage, a home addition, or a full accessory dwelling unit, we’ll help you navigate the process and maximize your investment.