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Plumbing Cost · New Hampshire

Plumbing Cost in New Hampshire (2026)

Plumbing in New Hampshire typically runs $7,900–$16,900 for a complete rough-in on a 2,000 sq ft single-family home (2.5 baths, kitchen, laundry, water heater).

Copper plumbing pipes forming a clean geometric pattern

New Hampshire context that moves plumbing rough-in cost

Climate: Cold New England climate with heavy snowfall, deep frost lines, and short building season. White Mountains region has extreme weather conditions.

Labor market: Above national average.

Permits & codes: New Hampshire follows the State Building Code based on the IRC. The state has no sales tax, making material purchases tax-free. Local enforcement varies — some towns have minimal oversight while others (especially in southern NH) have comprehensive requirements.

About plumbing rough-in in New Hampshire

Plumbing rough-in covers all the supply, drain, waste, vent, and gas piping installed inside the framing before drywall. Fixtures (toilets, sinks, faucets, tubs) are the finish phase and not included in rough-in pricing. The rough-in for a typical 2.5-bath home is a 3–5 day job for an experienced crew of 2–3 plumbers.

PEX is now the dominant residential supply material in most of the country — flexible, freeze-tolerant, fewer connections, and significantly faster to install than copper. Drain-waste-vent is typically PVC or ABS. Gas lines are still mostly black iron or CSST. Each material choice changes labor time and parts cost in ways that compound across a job.

What moves the price

Fixture count

The baseline assumes a 2.5-bath home with kitchen, laundry, and water heater. Each additional full bath adds $1,800–$3,200 in rough-in plus another $1,200–$2,500 in finish plumbing. Half-baths cost about half. Adding a wet bar, second laundry, or pot filler each adds $400–$900.

Supply material (PEX vs copper)

PEX is cheapest and fastest to install. Copper runs 20–35% more in materials and 15–25% more in labor for soldering. Copper is still required for gas lines in many jurisdictions and preferred by some buyers for branding/durability reasons. For 90% of residential supply lines, PEX is the correct choice.

Slab vs crawlspace vs basement

Slab-on-grade is most expensive for plumbing because every fixture drain has to be set before the concrete pour and any mistake means cutting concrete to fix. Basements with overhead service are cheapest. The same fixture count can vary 15–25% on this factor alone.

Water heater type

Tank water heater (40–50 gal gas or electric): $800–$1,800 installed. Tankless gas: $2,500–$4,500. Heat pump water heater (eligible for IRA tax credit and many state rebates): $2,800–$5,000. Tankless saves significant space and gives endless hot water; heat pump is the cheapest to operate but needs a 50+ gallon equivalent installation space and warm ambient temperature.

Code-driven additions

Backflow preventers on irrigation, expansion tanks at the water heater, sealed-combustion venting on gas appliances, and AAV (air admittance valves) where vent stacks would be impractical — each adds $200–$800 to a typical job. Newer code adoption cycles require more of these.

Permit and inspection

Plumbing permits in most jurisdictions are $200–$700. Rough-in inspection happens before drywall (verifies pressure test, slope, venting, materials). Final inspection happens after fixture installation. Skipping a required permit is the biggest cause of issues at home sale time.

Plumbing cost across New Hampshire metros

Within New Hampshire the spread between metros is usually 25–40% of the state midpoint. Major metros pay more than rural areas because of labor demand, permit complexity, and material delivery overhead.

  • Manchester / Nashua — typical home build $180–$410/sq ft range
  • Concord — typical home build $165–$380/sq ft range
  • Seacoast (Portsmouth) — typical home build $200–$460/sq ft range
  • Lakes Region — typical home build $190–$430/sq ft range

Frequently asked questions

How much does plumbing rough-in cost in New Hampshire?
A complete plumbing rough-in for a 2,000 sq ft home in New Hampshire runs $7,900–$16,900. That covers water supply, drain-waste-vent, gas piping, and fixture stub-outs for a typical 2.5-bath layout.
Why is plumbing labor priced differently in New Hampshire than its neighbors?
New Hampshire's plumber labor market reflects local demand for licensed trades. Hot construction markets push plumbing rates up because plumbers are the bottleneck trade — their work blocks framing inspections and drywall. New Hampshire's licensing and journeyman/master requirements also affect available labor supply.
Should I use PEX or copper in New Hampshire?
PEX is the default choice for New Hampshire residential supply lines unless your local code specifically requires copper. PEX handles freeze better than copper (relevant in New Hampshire's climate: Cold New England climate with heavy snowfall, deep frost lines, and short building season), installs faster, and costs less. Use copper for gas lines if required.
Does a New Hampshire plumber need a license?
New Hampshire requires licensed plumbers for permitted work in most jurisdictions. Some rural counties allow homeowners to do their own plumbing on a permit, but inspection requirements still apply. Always verify your contractor holds the appropriate New Hampshire state or municipal plumbing license before signing.
How much does it add to move a kitchen sink or bathroom fixture?
In an existing New Hampshire home, moving a kitchen sink to a new location adds $1,500–$3,000 in plumbing (new supply, drain, vent path). Moving a toilet is similar. Moving a tub or shower is the most expensive (often $2,500–$5,000) because the drain pitch requirement complicates retrofitting through existing framing. Plan layout changes carefully during remodels.

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Related

See the full 50-state plumbing rough-in cost comparison to see how New Hampshire stacks up nationally.

For broader benchmarks across New Hampshire, see the cost to build a house in New Hampshire.

Other trade costs for New Hampshire: