French Drain Installation Cost: What You’ll Pay per Linear Foot

Water pooling against your foundation or turning your lawn into a swamp is a problem that only gets more expensive the longer you ignore it. The most common fix is a French drain, and the first question every homeowner asks is the same: what does it cost?

The french drain installation cost in the U.S. typically lands between $1,000 and $18,000, though most projects fall in the $5,000 to $10,000 range. Per linear foot, plan on $10 to $100, depending on depth, labor rates in your area, and whether you need heavy machinery. It’s a wide range for a reason — a 25-foot shallow trench in loose soil is a very different job from a 200-foot perimeter excavation around a finished basement.

Here’s what actually drives that number, what you can expect to pay for materials and labor, and when it makes sense to grab a shovel yourself.

What Is a French Drain and Why It Matters

A French drain is a gravel-lined trench that holds a perforated pipe. Water seeps into the gravel, enters the pipe through the holes, and flows downhill away from your house to a discharge point such as a dry well, a storm drain, the street curb, or a low corner of the yard where it can soak in.

The name has nothing to do with France. It comes from Henry Flagg French, a Massachusetts lawyer who popularized the design in the 1859 book Farm Drainage. The concept hasn’t changed much since, because it works.

French drains solve three problems that gutters and grading alone can’t handle: a high water table that saturates your yard, surface water that pools in low spots after rain, and subsurface water pressing against foundation walls. Left unchecked, that moisture cracks foundations, rots sill plates, feeds mold, and turns a usable yard into a mud pit.

French Drain Installation Cost by Project Type

Because “a French drain” can mean a dozen different things, contractors price by the project rather than by a flat rate. The method that fits your situation is usually determined by where the water is coming from and where it needs to go.

Feature	Shallow Yard Drain	Foundation Perimeter Drain	Interior Basement Drain
Typical location	Lawn low spots	Exterior of foundation walls	Inside basement, along floor edge
Excavation depth	18–24 inches	6–8 feet	Below slab level
Cost per linear foot	$10–$25	$50–$100	$60–$100+
Total typical cost	$1,000–$5,000	$6,000–$18,000	$5,000–$15,000
Best for	Soggy lawn, patio runoff	Basement leaks, high water table	Finished basements, tight lots

A shallow yard drain is the cheapest option because it involves a short trench, no demolition, and no need to protect the soil around a foundation. The exterior perimeter drain is the most invasive: it means digging down to the footing around all or part of the house, which is slow, labor-heavy work and often requires an excavator.

What Drives the Price Per Linear Foot

Several factors push the per-foot price of a french drain installation up or down, often by two or three times.

Excavation difficulty. Soil is the wildcard. Sandy or loamy soil digs fast and cheap. Rocky soil, heavy clay, and tree roots slow the crew down, and hitting ledge or large boulders can add thousands. Contractors in the Northeast and Rocky Mountain states routinely bid higher for this reason.

Depth and width. A shallow 18-inch trench for a yard drain costs far less per foot than an 8-foot footing excavation, which needs trench protection (shoring or a sloped bench) to keep the walls from collapsing while workers are in the hole. That safety requirement alone can add $10–$20 per foot.

Access and demolition. If a skid steer can drive right up to the trench line, the job is efficient. If the crew has to hand-dig through a fenced side yard, break up a concrete patio, or work around utilities, expect the price to climb. Removing and replacing sod, shrubs, or hardscaping is usually quoted separately.

Permits and inspections. Most municipalities require a permit for drainage work that ties into a storm system or alters grading, and some require an inspection of the trench before it’s backfilled. Permits commonly run $50 to $500, and some towns require a drainage plan stamped by an engineer.

French Drain Installation Cost: Labor vs. Materials

Understanding the split between labor and materials helps you sanity-check bids.

Materials for a typical perforated-pipe French drain run $2 to $6 per linear foot on their own:

• 4-inch perforated corrugated pipe (ADS or NDS): $0.50–$1.25 per foot
• Clean drainage gravel (#57 stone): $40–$80 per ton, covering roughly 10 feet of trench
• Filter fabric geotextile (Typar or similar): $50–$120 per 300-foot roll
• Pipe fittings, catch basins, and a pop-up emitter or dry well: $50–$250 total

Labor is the big line item, running $45 to $100 per hour per worker, with most two-person crews costing $500 to $1,800 per day. Because digging is the bulk of the work, a job that a crew can knock out in one day is far cheaper per foot than one that stretches across three days.

For a straight, shallow 50-foot yard drain, materials might total $300 and labor another $700 to $1,400. For a 150-foot exterior foundation drain at depth, labor becomes the dominant cost and can reach $10,000 or more on its own.

Photo by Magda Ehlers via Pexels

DIY French Drain Cost vs. Hiring a Pro

Photo by 猫 鱼 via Pexels

Digging a shallow yard drain is one of the few major landscaping projects a handy homeowner can realistically tackle. The catch is that “realistically” depends almost entirely on depth.

For a shallow trench (under about 2 feet), a DIY French drain can cost as little as $300 to $1,000 for a 50-foot run — mostly gravel, pipe, and either a trencher rental ($70–$120 per day) or a lot of manual labor. If you hand-dig, be honest about the math: a 50-foot trench 18 inches deep and 12 inches wide means moving roughly 2.5 cubic yards of soil, which is genuinely hard work.

For anything near a foundation — which means a trench deeper than 4 feet — DIY is a bad idea for three reasons. First, backfill against a foundation must be compacted correctly or you create a new drainage problem. Second, trench walls at that depth can collapse, and an unshored 6-foot trench is a real fatality risk. Third, a botched perimeter drain is invisible until water damage shows up years later, at which point the fix costs more than doing it right the first time.

If you do go the DIY route, buy a grade stake tool or a self-leveling laser to ensure the pipe slopes at least 1 inch per 8 feet (a proper 1% grade) toward the discharge point — a pipe with a belly will hold standing water and fail. And don’t skip the geotextile fabric wrap; it’s what keeps silt from clogging the gravel and extending the drain’s useful life for decades.

Additional Costs to Watch For

Even a well-scoped bid can grow once the work starts. Here’s what to budget for beyond the drain itself.

• Sump pump and discharge: If your drain flows to a dry well that can’t handle the volume, or if you have an interior perimeter drain, you’ll need a sump pump ($150–$500 for the unit, $500–$1,500 installed).
• Landscaping restoration: Backfilling is included in most bids, but re-sodding, reseeding, and replanting shrubs usually isn’t. Budget $1 to $2 per square foot for sod replacement.
• Concrete and patio repair: If the trench crosses a walkway or patio, expect $8 to $12 per square foot to remove and repour concrete.
• Downspout tie-ins: Adding your gutter downspouts to the same drainage line is smart and cheap (often $50–$150 per connection), and it keeps roof water out of the equation entirely.

Getting three written bids is the single best way to protect yourself on price. When comparing them, look past the bottom line and check whether each quote includes trench backfill, sod replacement, permit fees, and disposal of the excavated soil — hidden exclusions there are the most common source of surprise charges. For related budgeting, see our guide to landscaping cost per square foot and our take on hardscaping ideas for your backyard.

Frequently Asked Questions

How much does a French drain cost per foot?

Most French drains cost $10 to $100 per linear foot installed. Shallow yard drains run $10–$25 per foot, while deep foundation perimeter drains toward $50–$100 per foot because of the deeper excavation and added safety requirements.

Is a French drain worth the cost?

For a home with a wet basement, soggy yard, or water pooling at the foundation, yes — drainage is almost always cheaper than the damage it prevents. Foundation repairs start around $2,000 for minor cracks and climb past $15,000 for structural work, which makes a $5,000–$10,000 drainage system a bargain by comparison.

Can I install a French drain myself?

Shallow yard drains under about 2 feet deep are DIY-friendly and can be done for $300–$1,000. Any trench near a foundation that goes deeper than 4 feet should be left to a pro, both for safety and because proper compaction against the foundation is critical.

How long does a French drain last?

A properly installed French drain wrapped in geotextile fabric typically lasts 30 to 40 years. The most common failure point is pipe clogging, which the fabric wrap prevents; drains installed without fabric can silt up in a decade or less.

Do I need a permit for a French drain?

Many municipalities require a permit when the drain ties into a storm sewer or alters site grading, and permits typically cost $50–$500. Check with your local building department, and confirm that your discharge point complies with local rules — dumping into the street or a neighbor’s yard is often prohibited.

For a step-by-step look at the install, This Old House breaks down how a French drain works.

The Bottom Line

The french drain installation cost is ultimately set by the depth and difficulty of the dig, not by some fixed market rate. A shallow yard drain might cost $1,000 to $5,000 and take a day; a full exterior foundation system can run $6,000 to $18,000 and take a week.

The cheapest quote isn’t always the best value. A drain that’s undersized, poorly sloped, or missing geotextile fabric will silently fail and need to be redone — paying for the full cost of the project twice. Get at least three itemized bids, demand that backfill, sod, and permits are spelled out, and don’t skimp on the fabric wrap or the gravel. Done right, a French drain is a one-time purchase that keeps your foundation dry and your yard usable for decades. If you’re already planning bigger yard work, check out our breakdown of irrigation system cost before you budget the full project.