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Costs · Basements & Drainage

French Drain Cost in NJ: Interior vs. Exterior, Per Foot (2026)

Quick answer

A French drain in New Jersey costs about $30 to $60 per linear foot for a shallow yard drain, $70 to $150 per foot for an interior basement perimeter system with a sump, and $100 to $250 per foot for a deep exterior footing drain. Call (201) 676-3099 or book a free estimate.

A French drain in New Jersey costs about $30 to $60 per linear foot for a shallow yard drain, $70 to $150 per foot for an interior basement perimeter system with a sump, and $100 to $250 per foot for a deep exterior footing drain. A typical interior system for a 1,200 square foot basement runs $9,000 to $18,000. This guide covers what each type does, what it costs, and how to know which one your water problem actually needs.

The three kinds, and what each fixes

TypeWhat it fixes2026 NJ cost
Yard / curtain drain (shallow, gravel and pipe)Soggy lawn, water running toward the house$30 – $60 per ft
Interior perimeter drain with sump pumpWater seeping at the basement floor-wall joint$70 – $150 per ft · $9,000 – $18,000 typical
Exterior footing drain (dig to the footing, waterproof the wall)Water through the wall itself, high water table$100 – $250 per ft · $15,000 – $40,000 typical

Before you dig: the cheap fixes to try first

  • Extend downspouts 6 to 10 feet from the foundation ($50 to $300)
  • Regrade the soil so it slopes away from the house 6 inches over 10 feet ($800 to $3,000)
  • Clean the gutters and fix the one that overflows
  • Check the window wells for drains and covers
  • Seal the driveway or walkway joint against the foundation

When a French drain is the wrong answer

If water is coming through a crack in a poured wall, inject the crack ($400 to $1,200). If it is a plumbing leak or a sewer backup, it is a plumber's job. If the yard floods because the town storm drain backs up, no drain on your property will help. A real diagnosis first, then the fix. We do the water test and tell you which one it is.

What is in a proper interior system

  • Concrete floor cut and removed along the perimeter
  • Perforated pipe in washed stone, sloped to the pit
  • A dimpled wall membrane that channels wall seepage into the drain
  • A sump basin with a quality pump and a battery backup
  • Discharge line run well away from the house, with a check valve
  • New concrete over the trench

Guarantee

Our basement systems carry a written 5-Year Watertight Guarantee. If water comes back where we worked, we come back. See the basement waterproofing cost guide for full-system prices.

Questions people ask next

How long does a French drain last?

A properly built one with a cleanout, 30 to 40 years. Ones installed without filter fabric clog in 5 to 10.

Interior or exterior French drain, which is better?

Exterior stops water before it touches the wall but costs two to three times more and means digging up landscaping. Interior is cheaper, done in days, and handles most NJ seepage. We recommend interior unless the wall itself is failing.

Do I need a permit for a French drain in NJ?

Interior systems with a sump usually need a plumbing permit for the discharge; some towns also regulate where you can discharge. We handle it.

Can a French drain be installed in winter?

Interior, yes, any time. Exterior and yard drains wait for the ground to thaw.

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Water in the basement or a yard that never dries?

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