How Much Does French Drain Installation Cost in New Hampshire?
New Hampshire pricing is above the national average. Updated for 2026.
French Drain Installation Pricing in New Hampshire
In New Hampshire, the average cost for french drain installation is $5,600 per project, which is 12% higher than the national average of $5,000. Most New Hampshire residents pay between $1,120 and $11,200.
New Hampshire has a higher cost of living than most states, which translates to higher labor rates and material costs. Urban areas within New Hampshire may be even higher.
French drains redirect water away from your foundation using a perforated pipe in a gravel-filled trench. Critical for preventing basement flooding and foundation damage.
New Hampshire vs National Average
What Affects French Drain Installation Cost in New Hampshire?
Type
Interior: $40-$100/linear ft. Exterior: $60-$120/linear ft. Full perimeter: $5,000-$12,000
Additions
Sump pump: $500-$1,200. Drain tile: $20-$40/linear ft. Channel drain: $30-$75/linear ft
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Top-Rated French Drain Installation Pros in New Hampshire
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⭐ PREMIUMProudly serving NH since 2000. Licensed, insured, and committed to excellence.
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⭐ PREMIUMProudly serving NH since 2008. Licensed, insured, and committed to excellence.
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💡 Tips to Save on French Drain Installation in New Hampshire
- 1.Interior French drains are cheaper ($40-$100/linear ft) than exterior ($60-$120/linear ft)
- 2.DIY is possible for simple exterior drains
- 3.Address grading issues first — sometimes regrading alone solves drainage
- 4.Bundle with waterproofing for better pricing
📈 French Drain Installation in New Hampshire Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $4,756 | — |
| 2021 | $4,956 | +4.2% |
| 2022 | $5,278 | +6.5% |
| 2023 | $5,426 | +2.8% |
| 2024 | $5,600 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for French Drain Installation in New Hampshire
Recent Reports
Frequently Asked Questions
Do French drains really work?
Yes. A properly installed French drain is one of the most effective solutions for redirecting groundwater. They typically last 30-40 years with minimal maintenance.
French Drain Installation Cost in Other States
Related Cost Guides for New Hampshire
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