Residential drainage work typically costs $500-$12,000, with a common project averaging about $4,500; extensive yard or foundation systems can exceed $20,000. The cost of drainage work depends most on the system type, trench length, soil and access conditions, and whether excavation, grading, or indoor plumbing is required.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Downspout extensions | $150 | $600 | $1,500 | Several extensions, splash blocks, or buried pipe |
| Yard regrading | $500 | $2,500 | $8,000 | Small slope correction to substantial reshaping |
| French drain | $1,500 | $5,000 | $12,000 | About 50-100 linear ft, with access and outlet affecting price |
| Channel drain | $800 | $2,500 | $6,000 | Driveway or patio trench drain, often 10-30 linear ft |
| Foundation drainage system | $3,000 | $8,000 | $20,000+ | Interior or exterior perimeter work; excavation changes the total |
What a typical French drain or yard project costs
A straightforward residential drainage project usually lands between $1,500 and $8,000. A short surface channel or a few buried downspout lines may cost less, while a long French drain, broad regrading, or foundation perimeter system can push the estimate above $12,000. These ranges assume a typical single-family property, standard materials, and no major retaining wall or utility relocation.
Contractors commonly price French drains at $20-$60 per linear foot, including a perforated pipe, gravel, filter fabric, and typical installation labor. Difficult excavation, deep trenches, or extensive restoration can raise the rate to $75-$100 per linear foot. Yard grading often runs $1-$4 per square foot for modest work, but importing soil, removing trees, or moving large volumes of earth adds expense.
For many homes, a 50-100-foot drain or grading correction costs roughly $2,500-$7,500. The estimate should state the drain length, depth, outlet location, surface restoration, and whether soil disposal is included. Assumptions: Average U.S. labor rates, standard residential materials, normal machine access, and no major utility conflicts.
How pipe, gravel, excavation, and labor shape the quote
Drainage bids combine materials and installation work, but the balance differs by system. A simple downspout line is relatively material-light; a deep French drain or foundation system requires more excavation, hauling, and restoration. The table shows typical cost shares for a mid-sized project and representative line-item prices. Ranges vary by local wages and site conditions.
| Cost component | Typical charge | Common scope | What changes the price |
|---|---|---|---|
| Pipe, gravel, and fabric | $5-$20 per linear ft | Perforated pipe, clean stone, filter fabric | Pipe diameter, stone type, and drain depth |
| Excavation and labor | $10-$40 per linear ft | Trenching, setting pipe, backfill | Soil, access, trench depth, crew time |
| Equipment | $200-$1,200 per project | Mini-excavator, trencher, compactor | Rental duration and machine access |
| Outlet and fittings | $100-$1,000 per project | Catch basin, solid pipe, pop-up emitter | Distance to discharge point and number of inlets |
| Disposal and restoration | $200-$2,500 per project | Soil hauling, sod, seed, paving repair | Excavated volume and surface material |
| Permits and inspection | $0-$500 | Local review where required | Municipal rules and discharge location |
On an average $5,000 French drain, materials might account for $800-$1,800, labor and excavation $2,000-$3,000, and equipment, outlet, and restoration the remainder. This is a planning breakdown, not a fixed allocation; contractors may combine tasks into a single installed rate.
Ask for separate excavation, pipe, outlet, and restoration amounts so bids can be compared on the same scope. Confirm whether the contractor is including a cleanout, catch basin, and a lawful place to discharge collected water.
Drain length, soil type, and slope can change the estimate
Length is a major pricing driver because each additional foot adds trenching, pipe, stone, and backfill. A 40-foot French drain at $25-$60 per foot may total $1,000-$2,400 before substantial restoration; a 120-foot run can be $3,000-$7,200 on the same basic rate. Multiple drain branches or catch basins add parts and labor, even when the total footage stays similar.
Depth and soil conditions matter too. A shallow trench around 12-18 inches is typically less costly than one 24-36 inches deep, which may require more excavation, shoring precautions, and spoil removal. Clay soil can slow digging and drain poorly; rock, roots, buried concrete, or a high water table can add $500-$3,000 or more. A contractor should inspect the proposed route rather than assume easy digging.
Drainage also needs a workable outlet. A gravity line generally needs continuous fall toward an approved discharge point; a site without adequate slope may need a sump basin and pump. A basic sump pump installation often costs $800-$2,500, while adding a long discharge route or battery backup can bring the total to $1,500-$4,000. Confirm the drain’s outlet and slope before comparing per-foot quotes.
How long drainage crews work and what labor rates include
A small downspout or surface-drain job may take 4-8 hours, while a 50-100-foot French drain commonly takes 1-3 working days for a three-person crew. Foundation drainage can take several days to more than a week, especially if workers must remove and replace concrete or excavate around the home. Weather, inspections, and access restrictions can extend the schedule.
Drainage labor is often bundled into a per-foot or project price. For estimating purposes, general labor and equipment operators may bill at $50-$100 per hour, while a plumber or drainage specialist may charge $75-$150 per hour. A crew of three working eight hours at a blended $65-$100 per worker-hour represents about $1,560-$2,400 in labor for one day, before equipment, materials, and contractor overhead.
Hourly billing is more common for diagnostics, small repairs, or exploratory work than for a defined installation. A drainage inspection or troubleshooting visit may cost $100-$400, sometimes credited toward approved work. Get the expected crew size, working days, and restoration tasks in writing. This makes it easier to identify whether a low bid assumes a smaller crew or leaves finish work out.
Three drainage quotes for different home conditions
These examples illustrate how scope changes the total. They assume ordinary access and typical U.S. contractor pricing; local labor, soil, and surface restoration can move each figure. The totals include common installation tasks but not major landscaping redesign or unexpected buried obstacles.
| Project example | Scope and unit rate | Labor and schedule | Estimated total |
|---|---|---|---|
| Downspout water moved away | 60 linear ft of solid pipe at $12-$25 per ft, two outlets | Two workers, 4-6 hours | $900-$1,800 |
| Backyard French drain | 80 linear ft at $30-$60 per ft, gravel and fabric, pop-up outlet | Three workers, 1-2 days | $3,000-$6,000 |
| Driveway channel drain | 20 linear ft at $40-$100 per ft, concrete cutting and drain connection | Two or three workers, 1-2 days | $1,800-$4,500 |
The driveway example costs more per foot than a basic yard drain because cutting and patching concrete adds specialized work. Likewise, a French drain in an open lawn may be cheaper than one routed through landscaping, a patio, or a narrow side yard. Match the quote to the actual route and surface repair, not just the drain length.
Regional labor and access create different drainage prices
Quotes tend to be higher in major coastal metros and high-cost urban areas than in many rural or lower-cost markets. A useful planning adjustment is about 15%-30% above national midrange prices in expensive markets such as parts of California, the Northeast, and the Pacific Northwest. Many smaller Midwestern and Southern markets may come in 10%-20% below those metro prices, although local shortages or specialized work can reverse the difference.
Urban access can add cost when equipment cannot reach the work area, parking or staging is restricted, or debris must be carried through the home. Tight side yards may require hand digging instead of a mini-excavator, adding $10-$30 per linear foot on some jobs. Rural properties may have lower labor rates but longer contractor travel, longer pipe runs, or no nearby approved stormwater connection.
Climate and local rules affect the design as well as the rate. Areas with heavy seasonal rainfall, freeze-thaw cycles, or expansive clay may need deeper burial, stronger fittings, or an outlet protected from freezing. These specifications should be reflected in the proposal; a low price based on a different drainage design is not a fair comparison. Use local quotes and adjust for access, not a single national average.
When grading, downspouts, or a sump pump cost less
Not every wet yard needs a full French drain. If roof runoff is the main source, extending downspouts 10-20 feet with solid pipe may cost $150-$500 per outlet, depending on burial and the discharge point. A shallow swale or regrading near the foundation may solve surface flow for $500-$2,500 on a modest area. These approaches are less expensive when water is moving over the surface rather than seeping up through soil.
A channel drain is suited to water crossing a driveway, garage threshold, or patio. A 10-30-foot installation often costs $800-$3,500, while concrete cutting, a long outlet line, or a traffic-rated grate can raise the price. A French drain collects groundwater through perforated pipe and gravel; a channel drain captures surface water at a grate. Neither is a substitute for fixing a leaking pipe or a foundation crack.
Interior basement drainage and sump systems can be effective when groundwater enters at the floor perimeter, but they are more involved than yard grading. Interior perimeter drains often run $40-$100 per linear foot, with many projects totaling $4,000-$12,000, including floor cutting and pump work. Exterior excavation to the foundation can run $80-$200 per linear foot where waterproofing, backfill, and landscaping repair are included. Choose the least extensive system that addresses the source of the water.
Permits, removal, and restoration that add to drainage bills
Minor downspout extensions or yard grading may not require a permit, but rules vary by city and watershed. A permit or inspection can cost $0-$500 for ordinary residential work; engineered drainage plans or stormwater reviews may cost more. Municipalities may restrict discharge onto sidewalks, neighboring lots, streets, or sanitary sewers. A contractor should identify the intended discharge point and confirm local requirements before digging.
Removal and restoration can be easy to overlook. Hauling excess soil may add $200-$1,000, while replacing sod or reseeding can cost $1-$4 per square foot. Repairing a concrete walk or driveway may add $8-$20 per square foot, depending on thickness, finish, and access. Buried irrigation lines, landscape lighting, tree roots, and utility conflicts may require extra labor or repairs.
Ask whether the bid includes utility marking, spoil hauling, surface restoration, and cleanup. Public utility locating services can mark many public lines, but private irrigation, lighting, and other owner-installed lines may need separate locating. Clarify exclusions before work begins to reduce change orders. A written allowance for uncertain rock or buried debris is more useful than an unexplained contingency charge.
Ways to lower a drainage quote without weakening the design
Start with a clear diagnosis. Photograph standing water after rain, note where it appears, and record whether downspouts discharge nearby. Addressing roof runoff or correcting a small grade problem can cost less than installing a full perimeter system. Avoid paying for a French drain until the contractor explains the water source, route, and outlet.
Keep the scope focused on necessary footage and surfaces. A drain along the problem area may be sufficient instead of treating the entire yard. Ask whether a solid pipe extension, swale, or regrading can handle surface runoff before choosing perforated pipe. Do not reduce the required slope, gravel envelope, or filter fabric merely to obtain a lower bid; those elements help the system function and resist clogging.
Compare at least three itemized quotes with matching length, depth, pipe type, outlet, disposal, and restoration. Schedule non-emergency work outside the wettest or busiest season when contractors have more flexibility, but do not delay active basement flooding or foundation damage. Combining nearby downspout and grading work may reduce mobilization charges. Save money by controlling scope and comparing equivalent designs, not by omitting essential drainage details.