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Foundation Cost in Washington (2026)

New-construction foundation pours in Washington typically run $21,400–$51,400 for a full-house 2,000 sq ft new-construction foundation pour, with full basement pour as the dominant residential foundation type. Buried footings must clear the 18-inch design frost line. Washington's combination of Cascadia subduction zone seismic exposure forcing ASCE 7-22 SDC D1 seismic design category requirements on every coastal residential foundation pour from Cape Flattery to Long Beach, ASCE 7-22 SDC D0-D1 seismic detailing across the Puget Sound including Seattle, Tacoma, and Olympia, statewide radon zone 1 designation across eastern Washington counties (Spokane, Pend Oreille, Stevens, Ferry) forcing sub-slab depressurization rough-in on every residential foundation, Pacific Northwest high water table across the Coastal Range and Puget Sound driving sump-pump and capillary-break specification, and WSEC above-IECC-baseline foundation insulation R-value mandate drives aggressive seismic-and-energy-code-driven foundation engineering.

State Washington
Cities Covered 28
Typical full-house 2,000 sq ft new-construction foundation pour $21,400 – $51,400
BLS construction-laborer wage $28.84/hr

Washington climate, soil, seismic & hydrologic drivers

  • Frost-line trench depth: 18-inch design minimum for buried footings
  • Dominant residential foundation type: Full basement — dominant in Upper Midwest, Northeast, and Mid-Atlantic on freeze-thaw + radon-zone-1 sites
  • Expansive soil risk: Moderate — periodic clay shrink-swell, standard footing reinforcement adequate
  • Seismic design category (ASCE 7-22): SDC D1 — high seismic risk + Special Inspector continuous observation required
  • Hurricane wind tier: Moderate — 110-140 mph design wind, standard tie-down
  • Water table risk: High — periodic water table within footing depth, sump-pump rough-in standard
  • Sulfate exposure (ACI 318): S0 — no sulfate exposure, Type I/II cement adequate
  • IECC climate zone: 4C-5B
  • EPA radon zone: Zone 2 (moderate) — sub-slab depressurization rough-in recommended

Washington licensing & permits

  • License status: Statewide license required
  • License board: Washington State Department of Labor & Industries — Contractor Registration (General or Specialty) (official site)
  • Permit: city or county building permit required for residential foundation pour; WA L&I Contractor Registration required for all residential work; WA State Energy Code WSEC 2021 above-IECC-baseline foundation R-value mandatory; Cascadia subduction zone seismic detailing mandatory on coastal Washington residential pours

How foundation pour costs vary in Washington

State-specific code or insurance rule: Washington State Department of Labor & Industries §18.27 requires every Washington foundation contractor to register with the WA L&I Contractor Registration program plus carry a $12,000 General Contractor or $6,000 Specialty Contractor surety bond — one of the most aggressive consumer-protection bond regimes in the country, with the WA L&I Construction Contractor Registration Section operating active enforcement against unregistered contractors statewide, plus WA State Energy Code (WSEC, WAC 51-11C) separately mandates above-IECC-2021-baseline foundation insulation R-value (R-15 continuous below-grade plus R-19 cavity) on every Washington residential foundation pour, and Cascadia subduction zone seismic detailing mandatory on every Washington coastal residential pour.

Cities in Washington

Compare foundation pour pricing for 28 cities across Washington.

Auburn, WA

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Bellevue, WA

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Bellingham, WA

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Bremerton, WA

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Burien, WA

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Edmonds, WA

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Everett, WA

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Federal Way, WA

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Kennewick, WA

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Kent, WA

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Kirkland, WA

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Lacey, WA

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Lakewood, WA

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Marysville, WA

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Olympia, WA

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Pasco, WA

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Puyallup, WA

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Redmond, WA

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Renton, WA

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Richland, WA

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Sammamish, WA

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Seattle, WA

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Shoreline, WA

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Spokane, WA

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Spokane Valley, WA

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Tacoma, WA

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Vancouver, WA

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Yakima, WA

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Pricing ranges reflect Washington market labor (BLS OEWS construction-laborer (foundation work) mean $28.84/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.