Professional team to build studio sheds and backyard offices
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Seattle ADUs, Built the Right Way
A smooth, guided design–build process for ADUs, DADUs, and backyard offices — from feasibility to final inspection.
About Our ADU Services in Seattle
An ADU (Accessory Dwelling Unit) is a fully independent living space on your property — perfect for rental income, family housing, or simply adding more room without leaving the neighborhood you love. In Seattle, ADUs can be attached to your home (AADUs), built as a detached backyard cottage (DADU), or created by converting a garage or finished basement.
We design and build ADUs that fit your lot, your home, and your goals. Our team manages everything — feasibility, architectural design, engineering, SDCI permitting, and construction — so your ADU comes together smoothly from the first idea to move-in day. Whether you’re planning a rental unit, a guest cottage, or a space for family, we help you create something functional, beautiful, and built to Seattle’s requirements.
What You Can Build With Us
- Attached ADUs (AADUs): Lower-level or side-addition units with private entrances.
- Detached ADUs (DADUs): Backyard cottages up to 1,000 sq ft for rentals or multigenerational living.
- Garage Conversion ADUs: Transform an existing garage into a legal, efficient living unit.
- Basement ADUs: Finished lower-level spaces ideal for rental or extended family living.
Why Homeowners Choose ADUs
- Rental income to offset mortgage costs or create long-term revenue.
- Space for family without buying a second property or leaving Seattle.
- Increased property value with a fully permitted, livable unit.
- Flexible use — guest cottage, teen suite, workspace, or future housing.
Why Seattle Homeowners Choose Us
Seattle ADU Experts
We understand Seattle’s zoning, SDCI permitting, lot requirements, and build standards. Our team guides you through everything so your ADU is designed and approved the right way.
Full Design–Build Service
From feasibility and architectural design to engineering, permits, and construction, we manage the entire ADU process under one team for a smooth, stress-free experience.
Quality Builds, Transparent Process
You get clear communication, up-front pricing, and thoughtful craftsmanship—whether it’s a DADU, basement ADU, garage conversion, or attached addition.
Recent ADU Projects in Seattle
A collection of ADUs, DADUs, basement conversions, and backyard cottages we’ve designed and built throughout Seattle and the Puget Sound.
What Seattle Homeowners Say About Our ADU Builds
Seattle ADU FAQ
Do you handle the entire ADU project or just the build?
We’re a full design–build team. We handle feasibility, architectural design, engineering, SDCI permitting, and construction, so you don’t have to coordinate multiple vendors.
Can you help me figure out what type of ADU fits my property?
Yes. Our feasibility review looks at zoning, setbacks, buildable area, and utilities, then recommends whether a DADU, attached ADU, basement ADU, or garage conversion is the best fit for your lot and goals.
Do Seattle ADUs usually require utility upgrades?
Often they do. Depending on your existing electrical capacity, sewer line, and water service, the city may require upgrades. We evaluate this up front and include any required utility work in your plan and budget.
How do you help keep ADU projects on budget?
We start with a detailed, line-item estimate and review it with you before finalizing design. During the build, we provide regular updates and approvals on any changes so you’re always clear on scope and cost.
Can you match my home’s style or build something more modern?
Yes. We can echo your home’s existing architecture or go in a more modern direction. Our design team works with you on materials, rooflines, and details so the ADU feels intentional on your property.
Can I rent out my ADU in Seattle?
Yes. Seattle allows ADUs and DADUs to be rented long term (30+ days). Many of our clients build ADUs specifically for rental income, future flexibility, or to improve resale value.
What’s the typical timeline for designing and building an ADU?
Every project is different, but a common range is:
- 1–2 months for design and engineering
- 2–4 months for SDCI permitting
- 4–7 months for construction
We’ll give you a project-specific timeline once we’ve reviewed your property and ADU type.
