# Seattle ADU Builders
> Full-service ADU construction for Seattle and King County, Washington. Design, permitting, and construction of detached ADUs, attached ADUs, garage conversions, and basement conversions.

## About
Seattle ADU Builders is a licensed ADU construction company serving Seattle and King County, Washington. We handle every phase of ADU development: feasibility analysis, architectural design, permitting through Seattle DCI and King County DPER, and full construction. Detached ADUs (DADUs) start at $450,000 in Seattle's market.

## Services
- Detached ADU (DADU) Construction: $450,000–$800,000+
- Attached ADU Construction: $300,000–$500,000+
- Garage Conversion ADU: $200,000–$325,000+
- Basement ADU Conversion: $225,000–$400,000
- ADU Permitting Services: Free when we build
- ADU Design & Architecture: Included with build

## Service Area
- Seattle, WA (all neighborhoods)
- King County (Bellevue, Renton, Kirkland, unincorporated areas)

## Key Resources
- Free Feasibility Study: https://www.seattleadubuilders.com/feasibility
- ADU Cost Breakdown: https://www.seattleadubuilders.com/adu-costs-king-county
- Pricing: https://www.seattleadubuilders.com/pricing
- ADU Laws & Regulations: https://www.seattleadubuilders.com/adu-laws
- Permitting Guide: https://www.seattleadubuilders.com/permitting
- ADU Guide: https://www.seattleadubuilders.com/adu-guide
- Neighborhood Guides: https://www.seattleadubuilders.com/neighborhoods
- Portfolio: https://www.seattleadubuilders.com/portfolio

## Regulations
- Seattle City Code (SMC 23.44.041 — DADU, SMC 23.44.025 — AADU)
- King County Code Title 21A (unincorporated areas)
- Washington HB 1337 / RCW 36.70A.680-681 (state mandate)
- Shoreline Management Act (200 ft buffer from Lake Washington, Lake Union, Green Lake, Puget Sound)
- Seattle DCI permit timeline: 6–10 weeks
- King County DPER permit timeline: 8–14 weeks

## ADU Laws
- Seattle City Code: https://www.seattleadubuilders.com/adu-laws/seattle-city
- King County Code: https://www.seattleadubuilders.com/adu-laws/king-county
- Washington HB 1337: https://www.seattleadubuilders.com/adu-laws/washington-hb-1337
- Seattle vs King County: https://www.seattleadubuilders.com/adu-laws/seattle-vs-king-county
- Shoreline Management Act: https://www.seattleadubuilders.com/adu-laws/shoreline-management-act

## Contact
- Website: https://www.seattleadubuilders.com
- Contact form: https://www.seattleadubuilders.com/contact