Access is narrow
Discuss handling and staging before choosing a building system.
selected Puget Sound communities
ADU site feasibility in Snohomish County
A floor plan does not establish that a structure fits your parcel. This guide helps you assemble a site brief before design and pricing. It does not determine permitted unit count, setbacks, or parcel eligibility.
Prepared by NW STYLE HOMES 1 LLC · September 5, 2026
Identify the reviewing authority
Start with the property address and parcel number. Confirm whether a city or county administers the application; a Seattle, Everett, or Tacoma mailing address alone is not enough. Ask for current guidance for your proposed project type. Keep the answer and source with your site notes instead of applying another city’s rules.
Map access and staging
Sketch the proposed building location, route from the street, driveway, overhead obstacles, and places for deliveries or storage. Note slopes and existing structures that constrain movement. Ask how excavation, material handling, and waste removal would work. A compact design can still have a difficult and costly construction route.
Locate utility and drainage questions
Gather available sewer or septic, water, power, and drainage records. Mark unknowns rather than inventing routes. Ask which providers or qualified professionals need to confirm capacity and connection options. Resolve what site investigations belong before detailed pricing, and distinguish utility work from the building estimate.
Compare attached and detached options
An attached addition affects the existing home’s structure and daily use; a detached unit introduces its own access and service connections. Compare the complete site and building scopes. Request separate allowances for unresolved investigations, design, permits, and utilities. Confirm parcel feasibility before using an online unit price as your budget.
Bring this to the first conversation
- Address and parcel number
- Site sketch and access photos
- Utility and drainage records
- Attached/detached goals and occupancy needs
Keep a copy of this list with your project notes. Share only the records needed to understand the work; omit unrelated personal or financial information.
Local review and source links
Use the office for the actual property jurisdiction. A postal city name does not establish the reviewing authority. These official resources were checked September 5, 2026; confirm current requirements with the authority before applying.
- King County permits for unincorporated areas
- Snohomish County residential permits
- Pierce County residential permits
This is general project preparation, not a site inspection, design, permit determination, or fixed-price proposal.
Choose your next step
Utility records are missing
Identify the verification work before estimating connections.
Two layouts look possible
Compare complete site scopes, not floor area alone.
Discuss your project
Inquiries cover selected locations in King, Snohomish, and Pierce counties. Address, access, scope, and scheduling must be reviewed before a visit is offered. The Puget Sound name does not mean every shoreline, island, or municipality is a service location.
Review the service scope, then request an estimate on this site. Include the decisions you have already made and the questions still open.