Plumbing & Repipe Cost in California (2026)

Plumbing repipe in California typically runs $7,400–$18,800 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 12-inch design frost line. Hayward, San Andreas, and Newport-Inglewood fault zones impose seismic plumbing requirements unmatched outside the Pacific Rim — automatic gas shutoff valves on the meter, flexible braided supply connectors, strapped 50-gallon water heaters with two strap zones (top third + bottom third), and PEX-A retrofits favored over rigid copper for liquefaction-prone Bay-Delta and Los Angeles Basin soils.

State California
Cities Covered 40
Typical whole-house 2-bath PEX repipe $7,400 – $18,800
BLS plumber wage $36.21/hr

California water-quality & freeze drivers

  • IECC climate zone: 3B-3C-4B-5B — drives freeze-protection scope on supply lines
  • Frost-line trench depth: 12-inch design minimum for buried water service
  • Water hardness profile: Hard (7–10.5 grains/gallon) — softener cost-effective on tankless and water-heater retrofits
  • 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

California licensing & permits

  • License status: Statewide license required
  • License board: California Contractors State License Board — C-36 (Plumbing) (official site)
  • Permit: city plumbing permit required; CALGreen and Title 24 efficiency verification on new fixtures

How plumbing and repipe costs vary in California

State-specific code or insurance rule: California Health & Safety Code §116875 (AB 1953, effective 2010) is the original lead-free fixture law that pre-dated and shaped the federal Reduction of Lead in Drinking Water Act — every plumbing fitting sold in California for potable water must contain ≤0.25% lead by weighted average, and CSLB C-36 contractors who install non-compliant inventory face license suspension.

Cities in California

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