Permit Document
Checklist · Puget Sound 2026.

Stamped by a WA-licensed PLS. Required when existing record drawings are older than 10 years, the lot is on a slope >15%, or any structure is within 5 ft of a setback line.

1" = 10' or 1" = 20' scale. Show all structures, setbacks, easements, impervious area, tree canopy, and the proposed work footprint. Include the lot coverage and FAR calculations on the sheet.

Required in Seattle (Tier 1–4), Bellevue, Kirkland, Sammamish and Mercer Island. Tag every protected tree with DBH, species, and dripline.

Required when new + replaced impervious surface exceeds the city threshold (2,000 sqft in Seattle, 5,000 sqft in most Eastside cities). Must conform to the WA DOE Stormwater Manual for Western WA.

Temporary erosion and sediment control. Required on any ground disturbance >500 sqft. Show construction entrance, silt fence, inlet protection, and stockpile location.

Required when slope >15%, soils are mapped as liquefaction or landslide hazard, or the project is in a critical area overlay. Stamped by a WA-licensed PE-Geotech.

Wetlands, streams, fish & wildlife habitat, steep slopes. King and Snohomish counties require a written CAR + buffer plan when any portion of the parcel is mapped.

Stamped by a WA-licensed Professional Engineer (PE) or licensed Architect (per RCW 18.43). Cite the design code edition (IRC 2021 with WA amendments) on the title block.

Gravity loads, wind (Risk Cat II, 110 mph ASCE 7-22), seismic (SDC D1–D2 for Puget Sound). Include lateral force-resisting system narrative.

Reference IRC R602.10 braced-wall or engineered shear-wall design. Show hold-down placement and anchor schedule.

Delivered by the truss manufacturer with PE stamp. Must include layout, truss-to-truss connections, and uplift schedule. Submit at deferred submittal in most cities.

List every component you intend to submit after permit issuance — trusses, stairs, fireplaces, solar mounts. Must be approved by the EOR before installation.

Required when new dwelling unit count >1 or when access road grade exceeds 12%. Confirms hydrant flow rate (1,000 GPM minimum in most Puget Sound cities) and emergency-vehicle turning radius.

Required for any structure >3,600 sqft in Seattle, any DADU built off a 20' access drive, and most multifamily. NFPA 13D or 13R as applicable.

Required for commercial tenant improvement, multifamily, and any project receiving public funding. Reference 2010 ADA Standards and WA Type B unit requirements.

Required for ADUs and any new dwelling unit. Apply through the city addressing coordinator — most cities require approval before utility hookup.

Water, sewer, electric, and gas providers issue capacity letters confirming service can be extended. Required as part of the permit submittal in most jurisdictions.

Most Puget Sound school districts collect an impact fee per new dwelling unit at building-permit issuance. Confirm the current fee and the school district boundary for the parcel.

Required for any work in the public right-of-way — driveway aprons, sewer taps, curb cuts. Posted with the city before issuance.

Required for engineered foundations, post-tensioned slabs, structural welds, and high-load anchors. Signed by owner + special inspector before the first structural inspection.