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Seattle DADU Builder
We design and build detached ADUs (DADUs) that add private living space, rental income, and long-term value to your Seattle home — with a smooth, guided process from design to final inspection.
What We Build for Seattle Backyards
A DADU (Detached Accessory Dwelling Unit) is a standalone living space built in your backyard — perfect for rental income, multigenerational living, guest housing, or simply adding more space without leaving Seattle. DADUs are private, flexible, and fully permitted as legal dwelling units.
We design and build DADUs that fit your lot, match your home’s architecture (or take on a modern look), and meet Seattle’s zoning and SDCI requirements. From feasibility and design to engineering, permitting, and construction, we handle the entire process so your backyard cottage comes together smoothly.
Types of DADUs We Build
- Modern backyard cottages: Clean lines, large windows, and open floor plans.
- Cottage-style DADUs: Warm, homey designs that blend with Seattle neighborhoods.
- Rental-ready DADUs: Private layouts designed for long-term tenants.
- Multigenerational living units: Comfortable homes for family or future flexibility.
Why Homeowners Choose DADUs
- Long-term rental income backed by strong Seattle demand.
- Private living space that doesn’t require changing your main home.
- Boost in property value with a fully permitted, functional second home.
- Flexible use — family, guests, grandparents, returning adult children, office + living.
Why Seattle Homeowners Choose Us for DADUs
DADU Specialists
We build DADUs every year in Seattle and understand the design, zoning, and utility requirements that make backyard cottages possible here.
Designs That Fit Your Lot
Every backyard is different. We help you maximize space, privacy, and sunlight while staying compliant with setbacks, height limits, and lot coverage rules.
Full Design–Build Delivery
One team handles feasibility, architectural plans, engineering, permitting, and construction — so your DADU project stays on track and stress-free.
Recent DADU 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 DADU FAQ
How big can a DADU be in Seattle?
Most Seattle DADUs can be up to around 1,000 sq ft depending on your lot size, zoning, and lot coverage. We verify exact limits during our feasibility review.
Do I need a separate utility hookup for a DADU?
Some DADUs require electrical or sewer upgrades depending on the capacity of your existing home. We coordinate all utility assessments and handle any upgrades required by Seattle Public Utilities or SDCI.
Will a DADU affect my backyard privacy?
Not if it’s designed the right way. We position windows, entries, and outdoor areas to maximize privacy for both your main home and the DADU — especially on smaller Seattle lots.
Can a DADU have two stories?
Yes, if your zoning and height limits allow it. Many Seattle homeowners choose a lofted or two-story DADU to maximize usable space on smaller lots.
Can I use my DADU as a short-term rental?
Seattle restricts short-term rentals in many cases. Most DADUs are best suited for long-term rentals (30+ days). We can walk you through the current rules so your DADU stays compliant.
How long does it take to build a DADU?
Once permits are issued, most DADU builds take about 4–7 months depending on the design, season, and site conditions. We’ll give you a project-specific schedule after feasibility and design.
Can a DADU share a yard or outdoor space with my main home?
Yes. Many homeowners create small patios, shared spaces, or separate outdoor areas depending on how the DADU will be used. We help you plan a layout that works for privacy, access, and sunlight.
