ZIP Code 98101 Construction Cost Estimating & Crew Wage Index (Seattle, WA)
Bid-ready CSI MasterFormat Divisions 01–48 material takeoffs and labor cost estimates calibrated directly to postal code 98101 in Seattle, King County, Washington. Delivered in unlocked Excel + color PDF takeoff layers within 24–48 hours, flat fee from $80.
ZIP 98101 Calibration Card
- Jurisdiction
- King County
- ZIP Labor Index
- 125.1
- Material Freight Index
- 106.3
- Composite Multiplier
- 1.17x (116.6)
- Coordinates
- 47.6114, -122.3305
ZIP 98101 (Seattle, WA) Burdened Trade Labor & CSI Assembly Rates
Calibrated for Strong Union / Prevailing Wage bidding in King County (125.1 labor factor).
| CSI Division | Trade & Benchmark Assembly | ZIP 98101 Crew Rate | ZIP Installed Unit Cost | Flat Takeoff Fee |
|---|---|---|---|---|
| Div 26 | Commercial Electrical Distribution & LED Package | $98.20/hr | $22.85/SF | From $85 |
| Div 23 | Packaged VAV RTU + SMACNA Galvanized Ductwork | $93.57/hr | $26.12/SF | From $85 |
| Div 22 | Cast-Iron DWV + Type L Copper Domestic Plumbing | $95.33/hr | $11.43/SF | From $85 |
| Div 03 | 4,000 PSI Footings & Slab-on-Grade w/ Grade 60 Rebar | $81.19/hr | $277.51/CY | From $80 |
| Div 05 | A992 Wide-Flange Structural Steel + Metal Decking | $99.33/hr | $4956/TON | From $90 |
| Div 09 | Metal Stud Framing, Type X Gypsum & ACT Ceilings | $83.19/hr | $11.95/SF | From $80 |
| Div 31 | 3D GPS Mass Grading, Trenching & Select Structural Fill | $90.20/hr | $40.23/CY | From $95 |
WA Building & NEC Code Notes
Washington State Building Code + Washington State Energy Code (WSEC — strictest commercial heat-pump space/water heating rules in the US) + Seattle Director's Rules.
Site & Environmental Scope Factors
Puget Sound Seismic Category D deep soldier-pile shoring, building-envelope rainscreen air-barrier testing, and Central WA clean-hydro data centers.
Prevailing Wage Rules in ZIP 98101
Washington L&I Prevailing Wage (RCW 39.12) applies strictly to ALL public works and public building service maintenance.