Seattle Washington
Accessory Dwelling Unit (ADU) Contractors in Seattle
Thinking about building an accessory dwelling unit (ADU) in Seattle? You’ve come to the right place. Our list of experienced local contractors includes specialists in backyard cottages, basement conversions, garage apartments, and detached ADUs that meet Seattle’s unique building codes and zoning laws.
Whether you’re adding space for family, rental income, or a private home office, these professionals can help turn your vision into a fully functional living space. Every contractor listed is licensed, insured, and carefully vetted for quality and compliance. Explore below to find the right ADU contractor for your project.
Top Verified Accessory Dwelling Unit (ADU) Contractors in Seattle
Select a verified contractor below to view details
ADU Designer and Builder
New Day Construction specializes in building ADUs and DADUs in Seattle. Stylish, functional backyard cottages and in-law suites that expand your living space and increase property value. Their team handles everything from permitting to construction with efficiency and care.
Residential Only
ADU Designer and Builder
Denizen Construction specializes in ADU and DADU construction throughout Seattle, crafting efficient backyard cottages, in-law suites, and rental-ready units. Their compact builds are thoughtfully designed for maximum comfort, energy efficiency, and long-term property value. They are ideal for urban homeowners looking to expand.
Residential Only
ADU Designer and Builder
Emerald City Construction designs and builds ADUs in Seattle, delivering stylish backyard cottages and in-law units that maximize property value and livability.
Residential Only
ADU Designer and Builder
Model Remodel builds stylish ADUs in Seattle, combining energy-efficient features with thoughtful design to maximize small-space potential.
Residential Only
ADU Designer and Builder
Better Builders designs and builds ADUs in Seattle, offering custom backyard cottages and in-law suites that add value and flexibility to residential properties.
Residential Only
ADU Designer and Builder
Seattle Style Remodel builds custom ADUs in Seattle, offering smartly designed backyard cottages and in-law units that combine style, comfort, and utility.
Residential Only
ADU Designer and Builder
Axiom Design Build constructs stylish ADUs in Seattle, offering flexible backyard cottages and in-law suites designed for urban living and long-term value.
Residential & Commercial