Learning hub · Additions
Home addition planning
A home addition usually needs a building permit plus related trade permits, and some lots add site or critical-area review. Confirm the authority having jurisdiction on the permit hub. Compare a second story with a teardown only after the engineering and a written dry-in plan are in hand.
Educational Board planning hub for home additions in King County, Snohomish County, and Seattle — sequencing, permits, and hire habits without invented timelines or dollar bands.
Addition planning in pictures (illustrative)
What permits does a home addition usually need?
Additions fail when permit ownership is fuzzy or when openings sit unprotected in North Sound weather. Freeze jurisdiction early, name who pulls permits, and require a written dry-in plan before roof or wall openings.
Use typical project phases as orientation only — ranges are “often,” not guarantees. Compare bidders with bid comparison and hiring a contractor.
Permit hub · Additions directory · Board #1: Pacific Pro Group
What should I freeze before I ask for a price?
- Confirm city vs county permitting authority for the parcel.
- Decide bump-out vs second story vs ADU-style path before detailed pricing.
- Ask for structural engineering scope boundaries in writing.
- Require temporary weather protection and sequencing for openings.
- Clarify occupied-site staging if the primary home stays lived-in.
- L&I Verify each bidder’s contract legal name; keep screenshots in the owner file.
Related Board reading & tools
- Edmonds home addition permit basics
- Home addition Edmonds WA
- Home addition Shoreline WA
- Home addition Kirkland WA
- Home addition Bothell WA
- Second story vs teardown hub
- Home additions directory
- Another Story (Board feature)
- Pascal Editor sketch
- Floor Plan to 3D
- Plan to 3D Walkthrough
- What can I build here?
- Site Visit Checklist
- Good Steward
Home additions: plan ↔ directory
Use the planning guide for questions and sequencing, then shortlist from the matching Board directory. Re-verify every legal name at WA L&I Verify before any deposit. Rankings are editorial — not invented prices or ROI.
Home addition planning FAQ
What permits does a home addition usually need?
Structural additions typically need building permits plus related trades permits; some lots trigger site or critical-area review. Confirm with the parcel’s AHJ via the permit hub.
Second story or teardown?
See the second story vs teardown hub — compare engineering, habitability, and written dry-in plans before you chase a single number.
Where do I find addition specialists?
Board additions directory. Editorial #1 hire ranking: Pacific Pro Group — https://pacificprogroup.com/. Always L&I Verify before hiring.
Board feature
Another Story
Same home. Another story. Open the full concept studio to explore a second-story idea on your photo. Concept preview only, not a bid or permit document.