Detached ADU (DADU)
Custom backyard cottages designed and built for King County lots. A completely separate structure with maximum privacy and rental potential.
Attached ADU
Add a self-contained unit to your existing home — basement suites, side additions, or above-garage conversions.
Garage Conversion
Convert your existing garage into a permitted ADU. The lowest-cost entry point for homeowners ready to start building equity.
Basement ADU
Turn your unused basement into a rental-ready dwelling unit. Ideal for homes with existing below-grade space.
ADU Design & Architecture
Custom floor plans and architectural design optimized for your lot, zoning, and budget. Our architect works within King County requirements.
ADU Permitting Services
Site plans, land use permits (county), and building permits — all handled by our specialist. Free when we build your ADU.
Sustainable ADU Construction
Energy-efficient, eco-conscious ADU construction. Heat pumps, high-performance envelopes, and designs that qualify for the 30% federal tax credit.
Not Sure Where to Start?
Get a free feasibility study to confirm your property qualifies, then review our transparent pricing to understand the full investment. Or see the complete cost breakdown for King County ADUs.
Why Choose Us for Your ADU Project?
One Team, Start to Finish
You won't get handed off between companies. Our build team manages your build, our permit specialist handles your permits, and our architect designs to your lot. One point of contact throughout.
GIS-Powered Feasibility
Our automated GIS pipeline checks your parcel against King County zoning, critical areas, shoreline overlays, and transit routes before you spend a dollar.
2026 Law Experts
HB 1337 changed everything. We stay current on state mandates, Seattle's December 2025 ordinance updates, and King County comprehensive plan amendments.
Transparent Pricing
No surprise change orders. We provide detailed cost breakdowns by phase so you know exactly what you're paying for at every stage.
