PerimeterTileInterior drain, exterior dig or neither — decided by where the water is.

How much does basement waterproofing cost in Nashua, NH?

Interior basement waterproofing in Nashua, NH
$10,846
150 linear feet · typical range $7,231 – $15,908
Typical total$72 per linear feet$10,846
Range you should see in bidsthree bids on the same scope normally land inside this$7,231 – $15,908
Labor portion60% of the job — this is the part that moves by city$6,508
Material portion40% — bought at national prices$4,339
Cement Masons and Concrete Finishers pay near Nashuaabout $27/hr · Manchester-Nashua, NH metro$56,460/yr
U.S. mean for the same tradeSOC 47-2051$60,050/yr
Versus the national pricetrade pay here runs −6% against the U.S. mean−$404
Short pour season130 freezing days a year in Nashua. ACI 306 cold-weather protection — blankets, heated water, or waiting — is a real line item here, not boilerplate—

Notes

  • Where the number comes from. The national price for interior basement waterproofing is $75 per linear feet — interior drain tile pricing published for 2026, $50–$110 per linear foot. Labor is about 60% of that. Cement Masons and Concrete Finishers near Nashua, NH average $56,460 a year against a U.S. mean of $60,050 — a factor of 0.94 — so the labor half is scaled by that and the material half is not. Source: BLS OEWS May 2025 for the Manchester-Nashua, NH metro area, SOC 47-2051.
  • Why the city matters, not just the state. Trade pay moves inside a state as much as it does between states. Crews do not commute across a state to bid a job, and materials ship at national prices either way — so a metro wage is the honest input here and a state average quietly rounds four different cities into one number.
  • Short pour season. 130 freezing days a year in Nashua. ACI 306 cold-weather protection — blankets, heated water, or waiting — is a real line item here, not boilerplate.
  • What is in the price: breaking out the slab at the perimeter, the drain tile and gravel, a wall vapour barrier, re-pouring the concrete, a sump pit and pump.
  • What is not: a battery backup pump, exterior grading and downspout work, foundation crack injection, and finishing the basement afterwards. These are the lines that turn a $10,846 quote into a $13,558 invoice, so ask about each one before signing.
  • Use this as a bid check, not a quote. It prices an average job in average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a per-unit average.

interior basement waterproofing in Nashua, NH

$10,846 is the typical number, and three bids on the same scope normally land between $7,231 and $15,908.

That is $404 less than the same job priced at the national average.

Why the city changes the number

About 60% of this job is labor — $6,508 of the $10,846 above. Labor is the only part that moves locally; a bundle of material costs what it costs wherever it is nailed down.

Cement Masons and Concrete Finishers near Nashua average $56,460 a year, against a U.S. mean of $60,050. That is a factor of 0.94, so the labor half is scaled by it and the material half is not.

Source: BLS OEWS May 2025 for the Manchester-Nashua, NH metro area, SOC 47-2051.

What the quote should include

Short pour season

The lines that turn a quote into an invoice

Ask about each of them before you sign. On a job this size they are the difference between $10,846 and something a quarter higher.

Use it as a bid check, not a quote

This prices an average job in average condition. Access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average.

If a bid lands outside $7,231 – $15,908, that is not automatically wrong — but it is the question worth asking out loud.

Nearby sizes

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