How much does a French drain cost in North Carolina?

Most exterior French drains run about $10 to $65 per linear foot installed, according to national cost guides. A Charlotte-scoped cost page built from contractor feedback puts the local band tighter, at $23 to $36 per linear foot. A 100-foot backyard run lands near $1,000 to $6,500 in the national guides. The Charlotte page puts it at $2,340 to $3,640.

Those are market numbers, not our price list. Your figure depends on trench depth, run length, what the ground holds and where the water can go. If your yard sits wet after every storm, here is how yard and lot drainage work actually gets done.

What does a French drain cost per linear foot?

This work gets priced by the foot. The table below pulls published ranges from national cost guides and from a cost page scoped to the Charlotte market. Every number below belongs to somebody else’s research.

The same guides put the average whole project near $5,000. One guide’s typical band runs $1,650 to $12,250. Another sets a footing drain as high as $80 to $100 per foot. The spread is wide because a 40-foot side-yard run and a 200-foot system are not the same job.

What drives the price of a French drain?

Depth is the biggest lever. A shallow surface drain sits about a foot down. A drain set at the bottom of a footing is a deeper, slower dig. The guides price it two to three times higher per foot.

Length comes next, because every added foot brings pipe, gravel, fabric and labor. Access changes the number just as fast. A machine that can reach the trench line keeps the dig short. A 36-inch gate as the only way in turns the job into shovels and hours.

Union County and the east side of Charlotte sit on the Carolina Slate Belt. Shallow rock shows up in some digs. Red Piedmont clay drains slowly and it is heavy to move. Tree roots, old utility lines and a septic field can push the trench onto a longer route.

Restoration is the line item people forget. Sod, seed, a driveway cut or a patio that has to come up are real money. Ask any bidder whether putting the yard back is inside the price or on top of it. Sometimes regrading the yard so it falls away from the house belongs in the same scope.

Are French drains worth the money?

A French drain earns its price when the water has a lower place to go. The gravel and pipe collect water and carry it out. With no fall toward a ditch, a swale, a street or a daylight point, a drain only relocates the puddle.

The source of the water decides the rest. If the yard stays soaked because roof water dumps beside the foundation, a downspout line costs less and works better. If the whole lot leans toward the house, the grade is the real problem and the pipe is a bandage.

Where should you not put a French drain?

Avoid an outlet that dumps onto a neighbor. Concentrated runoff across a property line creates a new problem, and it can create a legal one. Check with your town or county before you set the discharge point.

Keep the trench off unmarked utilities. North Carolina 811 asks for three working days notice before digging, and that request covers homeowners and contractors alike.

A tie-in to the public storm system is its own question. Charlotte-Mecklenburg Storm Water Services says a repair it takes on has to carry water from a public street. It also has to serve the public good, not simply benefit one property owner. Private yard drainage is usually the owner’s to fix.

What can you do instead of a French drain?

Start with the grade. Moving a few inches of dirt so the ground falls away from the house solves a lot of standing water. It often costs less than a pipe run. Our blog on what land grading costs in North Carolina covers those numbers.

A swale is a shallow shaped channel that carries surface water across the lot. A dry well takes a burst of roof water and lets it soak in. Solid pipe from the downspouts to a lower spot handles roof water with no gravel trench at all.

Plenty of yards want a mix. A regrade fixes the broad surface, and a short drain handles the one corner that stays wet. That combination usually beats pipe alone in Piedmont clay.

Is an interior French drain the same job?

No. An interior French drain is cut inside the basement, in a trench around the inside of the footing. National guides price that at $40 to $100 per linear foot. It feeds a sump pump, and it counts as basement waterproofing, so a waterproofing contractor does it.

We stay outside. That means the yard drain, the regrade and the trenching for drain lines. It also means excavation around a foundation so a repair or waterproofing crew can reach the wall. When the water starts as a yard that drains toward the house, the outside fix does the most good.

Who should you call for drainage work near Charlotte?

A published range gives you a ballpark and a way to read a bid. It cannot tell you how deep your trench has to go or where your water can outlet. That part takes somebody standing in the wet spot with you.

Cornerstone Excavation Group is an excavation contractor based in Indian Trail, on the east side of Charlotte. We are 5.0-rated on Google. We look at the job on site first, then put a free estimate together. Call or text (980) 315-5707, or read more about drainage repair across the Charlotte metro.