ADU Contractor
A complete second home on your property.
Accessory Dwelling Units (ADUs) are one of the best investments a homeowner in the Pacific Northwest can make. We manage ADU projects from design to move-in-ready handoff — detached, attached, and garage-conversion ADUs.
What's Included
Every ADU Construction project we take on includes these core capabilities.
Detached ADU
Fully separate structure in the backyard — own address, own utilities.
Attached ADU
Addition connected to the main house, sharing select systems.
Garage Conversion ADU
Existing garage converted into a livable ADU unit.
City Approval Management
We handle city planning, approvals, and inspections end to end.
How It Works
Feasibility Review
We review zoning, setbacks, and utility capacity for your property.
Design & Approvals
Architectural plans drawn and submitted for city approval.
Construction
Full build by our crew with weekly progress updates.
Final Inspection & Handoff
Final inspection passed and space is ready before handoff.
Why Dawn Construction
One crew. One standard. Done right.
When you hire Dawn Construction for adu construction, you get a licensed, bonded crew that has done this work hundreds of times across Renton and the greater Seattle area.
We give you a written scope before we start, show up when we say we will, and clean up at the end of every day. No subcontractors you've never met. No surprise invoices.
ADU Contractor Across 9 Western Washington Counties
From our offices in Renton and Mukilteo, Dawn Construction serves 45 cities, from Bellingham to Olympia. See the full service area.
King County
- Renton
- Seattle
- Bellevue
- Kent
- Federal Way
- Redmond
- Issaquah
- Bothell
- Kirkland
- Sammamish
- Mercer Island
- Newcastle
- Auburn
- Tukwila
- SeaTac
- Burien
- Shoreline
- Kenmore
- Covington
- Maple Valley
Snohomish County
- Mukilteo
- Everett
- Lynnwood
- Marysville
- Arlington
- Monroe
- Snohomish
Pierce County
- Tacoma
- Puyallup
- Lakewood
- Gig Harbor
- Eatonville
Kitsap County
- Bremerton
- Silverdale
- Poulsbo
- Kingston
Thurston County
- Olympia
- Yelm
Island County
- Oak Harbor
- Coupeville
Skagit County
- Mount Vernon
- Burlington
- Sedro-Woolley
Whatcom County
- Bellingham
Mason County
- Shelton
Don't see your city? Contact us or call (206) 672-1711.
Ready to get started?
Call us or send an email — a real person on this crew will respond within one business day with a free, written estimate.