What a French Drain Should Really Cost to Install (2024)

TL;DR: A French drain typically costs $2,500 to $6,500 installed, or $10 to $50 per linear foot depending on trench depth, pipe material, and whether the water needs to be pumped away. DIY materials run $3 to $15 per foot, but most of the labor is digging, and a bad slope wastes the whole job. Get quotes from at least three contractors and ask each one where the water actually exits.

_Last reviewed: July 2026 · 8 min read_

Standing water along your foundation, a soggy patch that never dries, or a basement that smells damp after every storm — these are the reasons homeowners start Googling French drains. The tricky part is nobody quotes the same price twice, and it's hard to tell if $3,000 is a fair deal or a markup.

Okoniq Property Hub lets you log drainage repairs and contractor quotes in one place, so you can compare bids and track what actually got fixed over time.

How much does a French drain cost per linear foot?

Most French drains cost $10 to $50 per linear foot installed, with the national average landing around $25 per foot for a standard residential trench. A typical 100-foot run along a foundation or backyard low spot lands between $2,500 and $5,000, while longer runs with rock beds, fabric wrap, and a pop-up emitter push toward $6,500 or more.

The spread comes down to three things: depth, pipe type, and what's in the ground. A shallow surface drain 12 inches deep costs far less than one dug 3 feet down to intercept groundwater near a foundation. Perforated PVC pipe wrapped in landscape fabric runs cheaper than a full curtain drain system with a sump pump tie-in. And if the crew hits roots, buried utility lines, or solid clay that needs a mini-excavator, expect an extra $500 to $1,500 tacked on.

If your yard has a grading problem feeding the issue, it's worth checking whether downspouts are dumping water in the wrong place before you pay for a drain that just moves the same water somewhere else.

What drives the price up or down?

Trench length and depth matter most, but exit strategy is the hidden cost that surprises people. If the water can gravity-drain to a street, ditch, or daylight point downhill, you're on the low end. If the lot is flat and the water has to be pumped uphill or into a dry well, add $800 to $2,000 for a sump pump, basin, and electrical hookup.

Soil type changes labor time significantly. Sandy soil digs fast; rocky or clay-heavy soil can double the hours a crew spends per foot, and that labor is usually 50-60% of the total bill. Access also plays a role — a drain along a fenced side yard that only fits a hand shovel costs more per foot than an open backyard a mini-excavator can reach.

Interior French drains (installed inside a basement along the footer, tied to a sump pump) run a different price entirely: $45 to $80 per linear foot because it involves breaking concrete. That's a separate job from an exterior yard drain, and contractors sometimes blur the two in a quote, so ask which one you're actually pricing.

| Exterior yard drain | Interior basement drain | |---|---| | $10–$50 per linear foot | $45–$80 per linear foot | | Gravity or pump exit to daylight | Ties into a sump pump pit | | No concrete cutting | Requires breaking the slab along the footer | | Fixes surface and shallow groundwater | Fixes water entering through basement walls/floor |

Is it cheaper to DIY a French drain?

Yes, materials-only DIY can cost $3 to $15 per linear foot, roughly a third of the professional price, but the labor you're skipping is the part that determines whether the drain works. A trench needs a consistent slope of at least 1 inch of drop per 8 feet of pipe run. Get that slope wrong and water sits in the pipe instead of flowing out, which means digging the whole thing back up.

Renting a trencher for a weekend runs $100 to $300, plus $150 to $400 for pipe, gravel, and fabric for a typical 50 to 100-foot run. That's a real savings if you're comfortable checking slope with a laser level and you're not dealing with buried lines. If the water problem is actually coming from a slab crack rather than surface runoff, no amount of yard trenching will fix it — that's worth ruling out by reading up on signs of a slab leak under your floor first, since that's a plumbing repair, not a drainage one.

Where DIY gets risky is near a foundation. A drain dug too close or too shallow can undermine a footing, and in some counties a permit is required for any excavation deeper than 18 inches near a structure. Call your local building department before you rent equipment.

How do you know if you actually need a French drain?

You need one if water is pooling within 10 feet of your foundation for more than 24 hours after rain, or if a basement or crawlspace shows recurring dampness with no plumbing leak. A French drain solves surface and shallow groundwater problems — it does not solve a high water table, a failed sewer line, or gutter overflow.

Before paying for a full trench system, check simpler fixes first. Downspout extensions that carry water 6 to 10 feet from the house solve a surprising number of "drainage problems" for under $50. Regrading a low spot with a few yards of fill dirt can cost $200 to $600 and eliminate the need for a drain entirely. If water is backing up from the sewer side rather than the yard side, that's a different repair — see the signs in warning signs your sewer line is about to back up before assuming it's a yard issue.

A licensed contractor should walk your property and identify the actual source before quoting a trench length. If a quote arrives without them checking your gutters, grading, and downspouts first, get a second opinion.

What should be in a written quote before you sign?

A solid French drain quote should specify total linear feet, trench depth, pipe diameter and schedule (typically 4-inch perforated PVC), gravel type (usually 3/4-inch washed stone), fabric wrap brand, and the exact exit point. Vague quotes that just say "drainage system, $4,000" are the ones that lead to disputes about scope later.

Ask for the depth in writing — a 12-inch trench and a 24-inch trench solve different problems and cost differently, but both can be described as "a French drain" on an invoice. Also ask what happens to the excavated soil and sod; restoration of your lawn is sometimes a separate line item that adds $300 to $800 if not included upfront.

FAQ

How long does a French drain last?

A properly installed French drain with washed gravel and fabric wrap typically lasts 30 to 40 years before the fabric clogs enough to need replacement or flushing.

Does a French drain add value to a home?

It can prevent value loss more than add value directly — a documented, working drainage system reassures buyers and inspectors that a wet basement or yard issue has already been addressed, which avoids price negotiations at sale time.

Can a French drain freeze in winter?

Yes, if it's installed above the frost line in cold climates, standing water in the pipe can freeze and block flow; drains in northern states are typically installed 24 to 36 inches deep specifically to stay below frost depth.

Why did my contractor's quote double from the first estimate?

The most common reason is hidden soil conditions or roots discovered mid-dig, or a change in exit strategy from gravity drain to pump-assisted; always ask for a not-to-exceed clause or a per-foot rate for unexpected rock or utility conflicts.

Do French drains need maintenance?

Yes, flush the outlet end and check the pop-up emitter or daylight exit twice a year for debris; a clogged outlet is the number one reason a working drain suddenly stops draining.

This is educational information, not construction or engineering advice. Call a licensed drainage contractor or civil engineer to assess your specific soil and grading before excavating near a foundation.