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Plumbing & Repipe Cost in Washington (2026)

Plumbing repipe in Washington typically runs $6,800–$16,800 for a whole-house 2-bath PEX repipe, with PEX-A or PEX-B cross-linked polyethylene the dominant retrofit choice and the Uniform Plumbing Code (UPC) as the adopted enforcement basis. Buried service-line trench depth must clear the 18-inch design frost line. Western Washington from Olympia through Bellingham sits within the Cascadia Subduction Zone where a magnitude 9 megathrust event is projected with 30% probability over the next 50 years — Seattle, Tacoma, and Bremerton building codes require seismic gas-shutoff valves, double-strap water-heater anchorage, and PEX-A retrofits over rigid copper in the liquefaction-prone Puget Sound alluvial zone, with Eastside Bellevue-Redmond increasingly adopting voluntary seismic upgrades.

State Washington
Cities Covered 28
Typical whole-house 2-bath PEX repipe $6,800 – $16,800
BLS plumber wage $38.07/hr

Washington water-quality & freeze drivers

  • IECC climate zone: 4C-5B-6B — drives freeze-protection scope on supply lines
  • Frost-line trench depth: 18-inch design minimum for buried water service
  • Water hardness profile: Soft (under 3.5 grains/gallon) — minimal scaling, no softener required
  • Dominant retrofit supply material: PEX-A or PEX-B cross-linked polyethylene — dominant on whole-house repipes since 2005
  • Adopted plumbing code basis: Uniform Plumbing Code (UPC) — IAPMO model adopted statewide
  • Lead service line risk tier: Moderate — partial pre-1986 service line inventory under utility review

Washington licensing & permits

  • License status: Statewide license required
  • License board: Washington Department of Labor & Industries — Plumber Certifications (PL01 Plumber / PL02 Specialty / PT01 Trainee) (official site)
  • Permit: L&I or municipal plumbing permit; on-site sewage through county health departments

How plumbing and repipe costs vary in Washington

State-specific code or insurance rule: Washington RCW 18.106 created a unified Plumber Certification system administered by the Department of Labor & Industries — issuing PL01 (Journey-Level Plumber) and PL02 (Specialty Plumber: water heater, residential service) credentials that explicitly differ in scope under WAC 296-400A, with PL02 capped at residential service work below specific job-value thresholds and not authorized for new construction repipe scopes.

Cities in Washington

Compare plumbing and repipe 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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More state guides

Pricing ranges reflect Washington market labor (BLS OEWS plumber mean $38.07/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.