Licensed & insured NJ waterproofing contractor

Interior French Drain Installation in North Jersey

Water coming in where your basement floor meets the wall? Our French drain installation catches the water at the footing and pumps it out of your house — before it ever reaches your floor.

30-year limited, transferable warranty · 90 Google reviews

  • Free inspection and estimate — no pressure
  • Installed by our own crews, never subcontractors
  • Interior French drain systems for wet basements across North Jersey

Get Your Free French Drain Estimate

Share your name, phone and town. We'll call to arrange a visit and provide a free estimate.

30-YearLimited, transferable warranty
Based in ClarkWaterproofing NJ basements
Own CrewsNever subcontractors
Licensed & InsuredNJ HIC #13VH06363800
Signs you need a French drain

Water in your basement after every heavy rain?

  • Water along the bottom of the walls, where the floor meets the wall
  • Puddles or damp spots on the basement floor after rain or snowmelt
  • White, chalky residue on the walls (efflorescence) or peeling paint
  • A musty smell, rising humidity, or rust on the bottom of appliances
  • A sump pump that runs constantly — or no sump pump at all
  • An old drain system that has stopped working

Lingering moisture can also lead to mold. The EPA's guide to moisture in the home explains why it matters, and if mold has already started, see our mold remediation in NJ.

Book My Free Inspection
How water gets into your basement Basement cross-section: loose backfill soil around the foundation, underground water veins, a false water table, undisturbed soil and the water table below. Hydrostatic pressure pushes water in through window well leaks, water seeping through the cinder block wall, wall cracks, the floor-wall joint and floor cracks. Window well leaks Water seeps through the wall Wall cracks Floor-wall joint Floor cracks Floor joist Poured concrete wall Cinder block wall Basement floor Footer Footer Loose backfill ~10 ft around foundation Underground water veins False water table Undisturbed soil Undisturbed soil Water rises & wraps around the foundation Hydrostatic pressure Water table Effective Basement Solutions

How water gets into your basement: water seeps through block foundation walls and wall cracks, hydrostatic pressure pushes groundwater up through cracks in the floor and the floor-wall joint, and a high water table after heavy rain makes basement leaks worse. An interior French drain collects groundwater near the footing and directs it to a sump pump.

When outside drainage improvements aren't enough

Keeping gutters clear, extending downspouts and grading soil away from the house can reduce water around your foundation. These steps are worth checking when a basement leaks.

When groundwater continues entering at the floor-wall joint or through block walls, an interior French drain can collect that water and direct it to a sump pump.

We inspect where the water is entering before recommending a system, so your estimate addresses your basement's conditions.

How it works

How an interior French drain keeps your basement dry

After heavy rain, the soil around your foundation fills with water and pushes against the walls and floor. That force is called hydrostatic pressure, and it squeezes water through the joint where your floor meets the wall. An interior French drain — also called a perimeter drain or interior drain tile — relieves that pressure and gives the water somewhere to go.

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1. Collect at the footing

A perforated drain pipe sits in clean, washed stone below the floor, right beside your foundation footing, all along the walls.

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2. Drain the walls

Weep holes let water trapped inside block walls drain down into the system, and drainage board guides wall water into the stone.

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3. Pump it out

The pipe is pitched to a sump pit. The sump pump sends the water out of the house, away from your foundation.

Real New Jersey basements

From wet walls to a dry, usable basement

Examples from our New Jersey projects: water damage, installation in progress, and a finished sump installation.

Wet basement before French drain installation, with water-stained cinder block walls and a damp floorBEFORE
Water-stained walls and a damp floor after every heavy rain.
French drain installation in progress: new sump pit set in washed stone with drainage board along the basement wallsWHILE WORKING
Drain pipe in clean stone, drainage board on the walls, new sump pit going in.
Painted basement walls after interior French drain installation, with new concrete and drainage edgeWORK COMPLETE
Painted walls, new concrete and a drainage edge after the French drain installation.
Our installation process

How we install your French drain, step by step

Every photo below is from an actual Effective Basement Solutions job.

Basement French drain trench dug along the foundation wall with the footing exposed

1Open the trench to the footing

We cut and remove the concrete along your foundation walls and dig down to expose the footing, where water enters.

Water draining from weep holes drilled in a cinder block basement wall into the French drain trench

2Drill weep holes

On block walls we drill weep holes so water trapped inside the wall drains into the trench instead of building up.

French drain installation NJ: perforated drain pipe being installed in clean washed stone with drainage board along the basement wall

3Perforated pipe in clean stone

Perforated pipe is laid with a steady pitch toward the sump pit and bedded in clean, washed stone so water flows freely.

Drainage board and vapor barrier installed along the basement wall over an interior French drain

4Drainage board & vapor barrier

Drainage board at the base of the wall guides water into the drain, and a vapor barrier goes over the stone before concrete.

New sump pump installed in the sump basin connected to the interior French drain system

5Sump pit, pump & discharge

The drain connects to a sump pit and pump, with a discharge line that carries the water outside and away from the house.

Fresh concrete poured over a new basement French drain with a drainage edge along the cinder block wall

6New concrete & cleanup

We pour new concrete over the system, finish it flush with your floor, and leave your basement clean.

French drain installation cost

How much does a French drain cost in New Jersey?

Interior French drains are priced mainly by the linear foot — how much of your basement wall needs drainage. What else affects the price:

  • How many walls need the drain (one wall, a few, or the full perimeter)
  • Block or poured-concrete foundation walls
  • Whether you need a new sump pit and pump, or a battery backup sump pump
  • Where the discharge line can run outside
  • Finished walls, flooring, or obstacles along the walls

Every basement is different, so we measure yours and give you a free estimate — no guessing, no pressure.

Get your exact price

We'll inspect your basement, find where the water is coming in, measure the run, and give you an estimate.

Get My Free Estimate

or call 1-800-957-0075

Why homeowners choose us

A French drain contractor that does it right the first time

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Our own crews

No subcontractors, ever. The same local company that quotes your job installs it and stands behind it. About us.

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Transferable warranty

Every French drain we install comes with our 30-year limited, transferable warranty. Sell your home, and the protection goes with it.

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NJ Home Improvement Contractor

Licensed and insured in New Jersey. License #13VH06363800.

Recent job

French Drain Installation in Springfield, NJ

  • 60 feet of interior French drain
  • Wall drainage board
  • New sump pit and Zoeller M53 sump pump
  • Downspout connection
  • Completed October 2026
Get a Free Estimate for Your Home
Finished basement in Springfield NJ after French drain installation, with plastic vapor barrier on the wallsSump pit lid and sump pump discharge line set in new concrete after French drain installation in Springfield NJ
Service area

French drain installation NJ: towns we serve across North & Central New Jersey

Our French drain installation NJ crews work in Union, Essex, Morris, Somerset, Middlesex and Bergen counties, including:

See all service areas · All basement waterproofing services

Questions

French drain FAQ

What is an interior French drain?

It's a perforated drain pipe set in washed stone below your basement floor, along the inside of your foundation walls. It collects the water that would push through the floor-wall joint and carries it to a sump pump that pumps it outside.

Is a French drain inside the basement better than outside?

For water coming in at the floor-wall joint, an interior French drain is usually the most direct and cost-effective fix, because it relieves the water pressure right where it enters. We'll tell you honestly what your basement needs after we inspect it.

Do I need a sump pump with a French drain?

Yes. The drain carries water to a sump pit, and the sump pump moves it out of the house. Many homeowners add a battery backup so the system keeps working in a power outage.

Can you install a French drain in a finished basement?

Yes. We open only the strip of floor along the walls where the drain goes. Let us know about finished walls, flooring or built-ins during the inspection so we can plan around them.

How long does a French drain last?

A properly installed interior French drain lasts for decades. Proper pitch to the pump and clean washed stone keep it flowing, and every system we install is backed by our transferable warranty.

How long does installation take?

It depends on how many feet of drain your basement needs and what's in the way. You'll get a clear timeline with your estimate.

Will installation make a mess?

We contain the dust as we work and do a full cleanup when we finish.

How much does French drain installation cost?

It's priced mainly by the linear foot, plus the sump pit, pump and discharge. Every basement is different, so we give you a free estimate after we see it. Call 1-800-957-0075.

Ready for a dry basement?

Tell us about your basement. We'll call to arrange a visit, assess the water entry points, and provide a free estimate.