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Plumbing & Repipe Cost in Montana (2026)

Plumbing repipe in Montana typically runs $4,900–$12,500 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 48-inch design frost line. Montana's combination of 48-inch design frost line plus high-elevation diurnal swings drops crawlspace temperatures below 32°F overnight even when daytime highs reach 50°F, freezing exposed riser stubs that survive insulated-pipe Lower 48 conditions — and propane water heaters dominate rural residential supply where natural gas does not extend, requiring 100-gallon outdoor LP storage on most ranch properties.

State Montana
Cities Covered 4
Typical whole-house 2-bath PEX repipe $4,900 – $12,500
BLS plumber wage $28.18/hr

Montana water-quality & freeze drivers

  • IECC climate zone: 6B-7 — drives freeze-protection scope on supply lines
  • Frost-line trench depth: 48-inch design minimum for buried water service
  • Water hardness profile: Moderate (3.5–7 grains/gallon) — periodic appliance descaling recommended
  • 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: Low — minimal pre-1986 lead service line installations

Montana licensing & permits

  • License status: Statewide license required
  • License board: Montana Department of Labor & Industry — Board of Plumbers (Master / Journeyman) (official site)
  • Permit: DLI or municipal plumbing permit required; private water/sewer through DEQ

How plumbing and repipe costs vary in Montana

State-specific code or insurance rule: Montana 37-69 MCA created a Board of Plumbers under DLI but routes individual well-and-septic system permits to the Department of Environmental Quality under a Subdivision and Sanitation Act framework — making any new private water-supply or wastewater system a two-agency permit, with DEQ Subdivision Review required before the local health department issues the operating permit.

Cities in Montana

Compare plumbing and repipe pricing for 4 cities across Montana.

Billings, MT

Compare local plumbing and repipe pricing in Billings.

Bozeman, MT

Compare local plumbing and repipe pricing in Bozeman.

Great Falls, MT

Compare local plumbing and repipe pricing in Great Falls.

Missoula, MT

Compare local plumbing and repipe pricing in Missoula.

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Pricing ranges reflect Montana market labor (BLS OEWS plumber mean $28.18/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.