French Drain Installation Cost: What You'll Actually Pay Per Linear Foot

By Andrea · August 2026

French drain costs vary more than most cost-estimator sites admit — the range per linear foot shifts based on whether you're draining a soggy yard, protecting a foundation, or waterproofing a basement. This guide breaks down what drives the price and how to compare quotes accurately. For yard-specific installs, see the full French Drain For Yard Drainage cost breakdown.

What Goes Into a French Drain — and Why It Affects Price

A French drain is a trench filled with washed gravel and a perforated pipe, wrapped in filter fabric to prevent soil from clogging the stone over time. Water enters the gravel, drops into the pipe, and travels by gravity to a daylight outlet downhill or into a dry well. Simple in concept — but the cost changes fast depending on depth, soil, and where the water needs to go.

Trench depth is the single biggest cost lever — a shallow 12–18 inch trench suits surface runoff, while intercepting a high water table may require 24–36 inches, driving up excavation and gravel costs. Pipe diameter (typically 4-inch for residential jobs) also affects price. The full per-depth breakdown is in the French Drain For Yard Drainage cost guide.

French Drain Cost Per Linear Foot: Key Ranges

Most contractors price French drains per linear foot, with the number shifting based on trench depth, soil type, pipe diameter, site access, and discharge setup. These figures vary by region and project length — always get at least three quotes. Full per-foot ranges by soil type are covered in the French Drain For Yard Drainage cost guide.

• Shallow yard drain (12–18 in. depth, easy soil, daylight outlet): lower end of the per-foot range — typical for surface pooling in accessible backyards
• Mid-depth install (18–30 in., clay soil or limited machine access): mid-range per foot — accounts for slower digging and heavier gravel volume
• Deep or complex run (30+ in., rocky ground, long discharge to storm drain or dry well): highest per-foot cost — labor and material both increase sharply
• Interior basement drain (footing-level, concrete cutting, sump pump required): priced differently from yard work — see the full breakdown for basement French drain cost

A Simple Cost Estimate: What a 50-Foot Yard Drain Might Run

Example only — not a quote or guarantee. Costs vary by region, soil, and contractor. A 50-linear-foot yard French drain at mid-range pricing (18–24 inch depth, clay soil, gravel backfill, filter fabric, daylight outlet to lawn edge) typically produces a total that covers excavation, pipe and fittings, gravel, fabric, backfill, and basic outlet work. If the discharge has to run to a street or storm drain — adding another 20–30 feet of solid pipe — that footage adds to both material and labor. A longer run with rocky soil or a tight gate that prevents machine access can push the same linear footage well above mid-range. Get three quotes with itemized specs before budgeting.

What Drives Cost Up — or Down

• Soil type: clay slows digging and requires more labor time; rock may need hand tools or a jackhammer; sandy loam is the easiest and cheapest to trench
• Site access: a backyard with no gate wide enough for a mini-excavator means hand digging — often the biggest cost adder on suburban lots
• Discharge type: a simple daylight outlet costs little; routing to a dry well, storm drain, or sump pit adds material and may require a permit. See the French Drain For Yard Drainage guide for a full breakdown of discharge options and their impact on cost.
• Project length: unit costs sometimes decrease slightly on longer runs when equipment is already mobilized — ask contractors about per-foot pricing at different lengths
• Region: labor rates vary widely across the U.S. — the same spec in rural Alabama and suburban Boston will not carry the same price

Exterior vs. Interior: Two Different Systems

An exterior French drain runs along the outside of a foundation or through the yard to intercept groundwater before it reaches a structure. An interior basement drain — sometimes called a footing drain or perimeter drain — is cut into the concrete floor at the base of the basement walls and routes water to a sump pump. Interior systems involve concrete cutting, more confined labor, and a sump pump installation, which makes them a distinct category from yard drainage work.

If you're seeing water seep through basement walls or floors, a yard drain outside won't fully solve it — hydrostatic pressure at the footing level needs an interior system. The basement French drain cost guide covers interior system pricing in detail.

French Drain vs. Other Drainage Options

A French drain isn't always the right first move — if the grade is wrong, Yard Grading For Drainage may fix pooling without any pipe. For defined low spots, a Catch Basin captures concentrated surface flow more efficiently. For a full comparison of when each approach makes sense, see the French Drain For Yard Drainage guide.

Flat lots with no gravity discharge point may need a Sump Pump For Yard Drainage at the end of the French drain run. For a full side-by-side comparison of all yard drainage systems and costs, the Yard Drainage Solutions Guide covers when each approach makes sense.

DIY vs. Hiring a Pro

A short French drain — say 20–30 feet, easy soil, clear daylight outlet — is realistic for a capable DIYer with a rented trencher. The materials are straightforward: perforated pipe, washed stone, filter fabric. The part that trips up DIY installs is slope. The pipe needs a consistent fall toward the outlet — typically 1% grade or about 1 inch of drop per 8 feet. Get that wrong, and the system silts up within a few years.

For runs over 50 feet, clay soil, limited access, or anything near a foundation, a licensed drainage contractor is worth the cost — improper discharge can create real liability. The Yard Drainage Solutions guide covers what to realistically DIY versus hand off.

Before You Dig: Three Non-Negotiables

• Call 811 first — free utility marking is legally required in every U.S. state before any excavation. If a sump pump is part of your system, see the Sump Pump For Yard Drainage guide for cost and installation details.
• Check local permits — some jurisdictions require a permit for drainage work that connects to a storm sewer or redirects water off your property. If your system includes a pump, the Sump Pump For Yard Drainage guide covers permit considerations in that context.
• Confirm the discharge point — water that outlets onto a neighbor's property or into an unapproved location creates liability; a licensed contractor will know local rules

Getting Accurate Quotes

Three quotes minimum is the standard for a project of this scope — prices for the same spec can vary 30–50% between contractors in the same metro area. Ask each contractor to provide: total linear feet, trench depth, pipe diameter, gravel type and volume, discharge point and pipe material, and whether filter fabric is included. Vague quotes that just say "French drain installation" without those details make it impossible to compare bids.

For yard-specific installs — soggy lawn, low spots, surface pooling — the French Drain For Yard Drainage cost guide breaks down per-foot ranges by depth and soil type, with practical checks to run before calling contractors.

Estimate your French drain cost with our free 2026 calculator →