As of September 2026, a practical planning range for a professionally installed exterior yard French drain is about $20 to $50+ per linear foot. The University of Georgia’s current Green Stormwater Infrastructure demonstration lists $20 to $50+ per linear foot including materials and labor, while Angi’s September 2026 yard-drainage cost table lists French drains at $20 to $50 per linear foot and $2,000 to $7,000 per project. HomeGuide publishes a lower $10 to $35 per-foot range for shallow yard and curtain-style drains, which shows how much scope definitions can change the number. [1][2][3]
For budgeting, use the per-foot range as a starting point, not a quote. Length, trench depth and width, soil or rock, machine access, utility conflicts, the outlet route, hauling, and landscape restoration can move an estimate well outside a simple multiplication. This page covers exterior residential yard French drains. Interior basement perimeter systems and deep foundation waterproofing are different scopes and are not priced here.
| Measure | Planning figure |
|---|---|
| Planning range | $20–$50+ per linear foot installed |
| 50-foot planning math | $1,000–$2,500+ |
| 100-foot planning math | $2,000–$5,000+ |
| 150-foot planning math | $3,000–$7,500+ |
| Scope | Exterior yard French drain; added outlet, excavation, hardscape, hauling, and restoration may be separate |
What a Yard French Drain Usually Costs
The broad published range is not a sign that one source is necessarily “right” and another is “wrong.” Cost guides often use the same term for different jobs. A shallow drain across an open lawn is not the same project as a deeper interception drain beside a foundation, a trench that must be hand-dug between utilities, or an interior basement perimeter system.
For Drainage Helper, the most useful planning approach is to keep the scope narrow: an exterior yard French drain that uses a gravel-filled trench, geotextile, perforated pipe, and a gravity route to an appropriate outlet. UGA’s 2026 demonstration-site figure of $20 to $50+ per linear foot and Angi’s 2026 $20 to $50 range overlap closely enough to support that as a current planning band. HomeGuide’s $10 to $35 range is still useful context for simpler or shallower exterior work. [1][2][3]
The examples below are arithmetic, not representative quotes. They multiply the $20 to $50+ planning band by the drain length before property-specific add-ons.
| Drain length | Base planning math | Assumptions behind the math | What can push it higher |
|---|---|---|---|
| 50 ft | $1,000–$2,500+ | Straightforward exterior yard route with ordinary excavation | Restricted access, deeper trench, long outlet run, roots/rock, restoration |
| 100 ft | $2,000–$5,000+ | Longer yard run with similar basic drain assembly | Hand digging, hauling, multiple collection points, hardscape crossing, added grading |
| 150 ft | $3,000–$7,500+ | Long continuous run using the same planning range | Deep or difficult excavation, major restoration, pump requirement, complicated discharge plan |
Planning note: a quote can reasonably fall below or above these figures when the project definition, local labor market, excavation conditions, or included scope differs. Compare the written scope before comparing totals.
What Changes the Cost of a French Drain
The trench itself is only part of the project. A useful estimate explains what the contractor has to excavate, how water will enter the drain, how it will leave the property’s problem area, and what must be repaired afterward.
| Cost factor | How it changes the scope | What to ask on the estimate |
|---|---|---|
| Drain length | More trench means more excavation, pipe, fabric, stone, labor, and restoration. | What measured linear footage is included? |
| Trench depth and width | A deeper or wider trench takes more excavation and usually more stone, soil handling, and labor. | What trench dimensions are the quote based on? |
| Access and excavation method | Open machine access can be very different from hand digging through a narrow side yard or around fixed obstacles. | What equipment can reach the route, and where will hand work be required? |
| Soil, roots, and rock | Dense clay, large roots, buried debris, or rock can slow excavation and increase disposal or equipment needs. | What site conditions could trigger a change order? |
| Slope, elevation, and outlet | A French drain needs a workable route for collected water. A distant outlet, insufficient fall, or a pump requirement changes the system. | Where does the drain end, and is the outlet work included? |
| Pipe, stone, and geotextile | Material quantity and specification change with trench size and system design. | What pipe, stone, fabric, and fittings are included? |
| Collection components | A French drain may be paired with a catch basin or another inlet when concentrated surface water also needs collection. | Are any basins, inlets, or solid conveyance lines included? |
| Hauling and disposal | Excavated soil, old drainage material, or construction debris may need to be removed from the site. | Does the price include haul-off and disposal? |
| Landscape or hardscape restoration | Sod, seed, planting beds, edging, pavers, concrete, or irrigation disturbed by trenching may require separate repair. | What will be restored, to what finish, and by whom? |
| Permits, inspections, and utility conflicts | Local requirements vary, and buried utilities can force a route or excavation change. | Who verifies local requirements and who handles utility locating before work begins? |
What Is Usually Included in a French Drain Estimate?
A well-defined exterior French drain estimate should make the basic assembly and route clear. The exact materials and dimensions are property-specific, but the scope commonly includes trench excavation, geotextile or filter fabric, drainage stone, perforated pipe, fittings, backfill or finish treatment, and a planned outlet or connection. UGA’s demonstration drain, for example, uses an 18-inch-by-18-inch trench, nonwoven geotextile, stone, and 4-inch perforated pipe sloped toward a discharge point; those dimensions are a demonstration design, not a universal residential specification. [1]
The word “installed” does not guarantee that every surrounding task is included. Two contractors can quote the same linear footage but include different amounts of outlet piping, haul-off, surface restoration, grading, or collection hardware. That is why the written scope matters more than the headline per-foot price.
- Drain route and measured linear footage.
- Planned trench depth and width.
- Pipe type and diameter, plus whether outlet piping is perforated or solid where appropriate.
- Stone/gravel and geotextile specification.
- Connection points, fittings, cleanouts, basins, or other components included in the bid.
- Where collected water is intended to go and what outlet work is included.
- Excavated-soil handling, haul-off, and disposal.
- Lawn, planting-bed, irrigation, edging, or hardscape restoration.
Added Costs and Scope Changes to Plan For
The biggest budget surprises are often outside the perforated trench. They are the tasks needed to make the system complete or to return the property to usable condition.
A longer or more complicated outlet
The French drain has to move collected water somewhere appropriate. If the outlet is far from the wet area, the project may need additional solid conveyance pipe, more trenching, erosion protection, or another discharge/infiltration feature. A property with no workable gravity outlet may require a different design altogether. Colorado State University Extension notes that a French drain must flow downhill to an outlet, and that subsurface drainage works only when water can move through the soil to the drain and then downhill from the drain. [4]
Surface collection or combined drainage
A French drain is not automatically the best collector for a visible puddle or a concentrated sheet of runoff. A project may pair subsurface drainage with a catch basin, grading change, swale, or solid downspout line when the water source requires it. Those are added components, but they may also be what makes the overall system fit the problem.
Hardscape, roots, rock, and restricted access
Driveways, walks, retaining features, mature roots, rock, fences, gates, and narrow side yards can turn a straightforward trench into a slower excavation and restoration job. Ask the estimator which obstructions are already accounted for and which would be treated as unforeseen conditions.
Restoration and cleanup
Confirm whether the quoted finish means rough backfill, seed and straw, sod replacement, replanting, irrigation repair, paver reset, or another standard. Restoration can be a meaningful part of the project even when the drain itself is priced by the foot.
Permits, inspections, or local drainage requirements
Requirements vary by jurisdiction, project location, and where the water will go. Do not assume that a quoted drainage route may discharge to a street, storm system, ditch, neighboring property, or other destination without local verification. Ask who is responsible for checking and obtaining any required approvals.
Make Sure You Are Pricing the Right Drainage Solution
A French drain can be an expensive answer to the wrong water problem. Before comparing prices, confirm that the issue actually calls for subsurface interception or conveyance. The French drain guide explains how the system works and when it fits. If you are still comparing several ways to fix a yard, the broader yard drainage cost guide is the better starting point.
| What you observe | What to confirm before pricing a French drain |
|---|---|
| Soil stays saturated or seeps along a slope after rain | A subsurface drain may fit if there is a workable outlet and the wet layer can reach the trench. |
| Water collects at one obvious surface low point | A catch basin or grading correction may collect surface water more directly, sometimes with separate conveyance. |
| Runoff moves across the lawn toward a house or patio | Surface grading or a swale may need to intercept or redirect the flow before a buried drain is considered. |
| Roof water is the main source | A solid downspout drainage line may be more direct than asking a perforated French drain to handle concentrated roof discharge. |
DIY vs. Professional French Drain Cost
DIY installation can remove contractor labor from the budget, but it does not remove the cost of pipe, stone, fabric, fittings, delivery, tool or equipment rental, excavation, soil handling, disposal, and restoration. It also does not solve an unclear outlet or an uncertain water source. For that reason, this page does not apply a fixed “DIY savings” percentage.
A smaller, shallow exterior run can be more approachable when the homeowner clearly understands the water path, has safe access, and has a lawful and workable destination for the water. Longer or deeper excavation, work close to foundations or retaining structures, restricted equipment access, pump-dependent designs, and uncertain discharge conditions are stronger reasons to have the site evaluated and priced by a drainage-focused contractor or another appropriate trade.
Before any digging, contact 811 or the applicable state 811 center and wait for the required utility responses and markings. The national 811 service specifically includes home drainage and drain-tile projects among the work that requires a locate request; state procedures and waiting periods vary. [5]
How to Compare French Drain Quotes
The most useful comparison is not “Who has the lowest price per foot?” It is “Are these contractors pricing the same route, drain, outlet, and restoration scope?” Put each estimate side by side and look for clear answers to these questions:
- What exact problem is the proposed French drain intended to solve?
- What is the measured drain length, and does the quote separate perforated drain from solid outlet piping?
- What trench depth and width are included?
- What pipe, stone, geotextile, fittings, and cleanouts are specified?
- Where will the collected water go, and what outlet construction is included?
- Does the route require hand digging, special equipment, or hardscape removal?
- How will excavated soil, old drainage material, roots, or debris be handled?
- What lawn, landscape, irrigation, or hardscape restoration is included?
- Who is responsible for utility locating, permits, inspections, and local discharge verification?
- How are unforeseen rock, buried obstructions, or route changes priced?
- What maintenance access, warranty terms, and exclusions are documented?
When a Lower Quote May Not Be Cheaper
A lower total can be legitimate when the contractor has easier access, a shorter route, less restoration, or a simpler outlet. It can also look lower because the quote stops at the trench and leaves other work to the homeowner. Before deciding, make sure you are not comparing one complete drainage plan with another estimate that excludes the outlet, haul-off, catch basins, grading, sod, or hardscape repair.
Vague wording such as “install French drain” is difficult to compare. A better estimate describes enough of the route, trench, materials, outlet, restoration, and exclusions that you can understand what will actually be built. Price matters, but scope alignment is what makes the prices meaningful.
Plan the Project Before You Compare Prices
Before requesting estimates, document what happens during rain. Note where water first appears, whether it is flowing across the surface or keeping the soil saturated, how long the area stays wet, and which direction the property appears to fall. Measure the approximate route from the problem area to a plausible outlet area, and note fences, gates, trees, utilities, hardscape, or landscaping that could affect access.
Then ask contractors to price the same problem and explain the same outlet. If you need help deciding which trade to call, use Who Installs Yard Drainage?. For the larger budget picture, return to Yard Drainage Costs and Project Planning or compare other systems in Yard Drainage Cost: What Homeowners Can Expect.
Related Drainage Guides
- French Drains: How They Work and When to Use One
- Yard Drainage Cost: What Homeowners Can Expect
- Yard Drainage Costs and Project Planning
- Who Installs Yard Drainage?
Cost update note: Recheck the 2026 cost sources by March 2027, or before publication if this draft is published materially later than September 2026.
Sources
- University of Georgia, “French Drain” (opens in a new tab)
- Angi, “How Much Does Yard Drainage Cost? [2026 Data]” (opens in a new tab)
- HomeGuide, “How Much Does a French Drain Cost? (2026)” (opens in a new tab)
- Colorado State University Extension, “Soil Drainage” (opens in a new tab)
- 811 Before You Dig / Common Ground Alliance (opens in a new tab)
Cost sources should be rechecked by March 2027 or before public launch if later.