Drain tile typically costs $40-$150 per linear foot installed, with interior basement systems usually less expensive than exterior excavation. The drain tile cost per foot depends on access, soil, excavation depth, drainage materials, pump needs, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Interior drain tile | $40/ft | $65/ft | $90/ft | Basement perimeter, concrete slab work |
| Exterior drain tile | $70/ft | $110/ft | $150/ft | Excavation beside foundation |
| Typical 120-foot installation | $4,800 | $9,000 | $18,000 | Price varies with system type and site |
| Sump pump add-on | $700 | $1,400 | $2,500 | Pump, basin, and installation |
Typical drain tile prices by basement system
Interior drain tile generally runs $40-$90 per linear foot, or about $4,800-$10,800 for a 120-foot basement perimeter. The work commonly involves cutting and removing a strip of slab, installing perforated pipe in gravel, and restoring concrete. Exterior systems are often $70-$150 per foot because contractors must excavate around the foundation and protect or repair waterproofing.
A straightforward interior installation often averages about $65 per foot, while exterior work averages closer to $110. These are installed-price estimates, not pipe-only prices. Assumptions: standard residential basement, ordinary access, mid-grade pipe and gravel, and typical U.S. labor rates.
How pipe, excavation, and labor shape the quote
Material is only one part of a drain tile quote. Interior jobs require concrete cutting, debris removal, drainage stone, pipe, and slab patching. Exterior jobs add excavation, backfill, surface restoration, and sometimes foundation-wall waterproofing. Quotes may also include a sump basin, pump, discharge line, or electrical work.
| Quote component | Interior range | Exterior range | Typical pricing basis |
|---|---|---|---|
| Perforated pipe and gravel | $8-$20/ft | $10-$25/ft | Pipe, filter fabric, drainage stone |
| Cutting or excavation labor | $18-$40/ft | $30-$75/ft | Access, depth, soil, and disposal |
| Concrete patch or backfill | $8-$18/ft | $10-$30/ft | Restoration included in scope |
| Pump and basin | $700-$2,500 | $700-$2,500 | Equipment and installation |
Labor and site work usually explain more of the price difference than the pipe itself. A crew rate of roughly $75-$150 per hour may be reflected in a bundled project quote rather than billed hourly.
Perimeter length, depth, and soil conditions change cost
System length is a major cost driver: a 160-foot perimeter may cost substantially more than a 100-foot run, even when the per-foot rate is similar. Interior installation can become more complex when the slab is thicker than 4 inches, finished rooms obstruct access, or plumbing and utilities cross the work area.
Exterior pricing can rise when excavation exceeds about 6-8 feet, access equipment is limited, or crews encounter dense clay, rock, or a high water table. A corner lot, landscaping, deck, or driveway may add $500-$5,000 or more for removal and restoration. Ask the estimator to identify the assumed depth, measured footage, and restoration scope.
Save money by controlling drain tile scope
First confirm whether water enters through the floor-wall joint, foundation cracks, or another source; the repair scope should match the source rather than automatically replacing every drain line. Compare repair options with full replacement when an existing pipe is accessible and functioning in part. Avoid paying for duplicate drainage or a larger pump without a documented capacity need.
Obtain at least three itemized bids based on the same measured perimeter and discharge plan. Ask whether concrete disposal, slab patching, landscaping, permits, and pump electrical work are included. Keeping finishes and landscaping out of the work area can reduce paid labor and restoration charges.
Interior trenching or exterior excavation for the same foundation
Interior tile is often the lower-cost choice when the goal is to collect seepage at the basement perimeter; it avoids digging outside but requires cutting the floor. Exterior tile can address water before it reaches the foundation wall, but excavation and waterproofing make it more expensive. The right choice depends on the water path, foundation condition, and access—not just the quoted per-foot rate.
For a 120-foot perimeter, a basic interior system may total $4,800-$10,800 before major pump or finish upgrades. A comparable exterior project may reach $8,400-$18,000, especially if excavation is deep or restoration is extensive. Compare complete installed scopes rather than pipe prices alone.
Labor time and access affect installation schedules
A typical interior crew of 2-4 workers may need 2-5 days for a standard basement perimeter, including slab cutting, pipe placement, and patching. Exterior work may take 3-7 days, with more time required for excavation, waterproofing, and backfill. These ranges exclude drying time and major landscaping restoration.
Finished basements, narrow side yards, stairs, and limited equipment access can add labor hours or require smaller machinery. Ask whether the contractor expects to use a mini excavator, hand excavation, or concrete saw, and whether setup and cleanup are included in the quote. Access constraints can move a project above the quoted average even when footage is modest.
Three drain tile quotes for common project sizes
A 90-foot interior perimeter at $55 per foot totals about $4,950 before a pump; adding a $1,000 pump brings the estimate to roughly $5,950. A 120-foot interior system at $70 per foot totals $8,400, with slab patching included in the assumed rate. A 140-foot exterior system at $115 per foot totals $16,100 before unusually costly landscaping or wall repairs.
These examples use installed rates and show how length and system type change the budget. Actual bids may differ with region, depth, discharge routing, and included restoration. Confirm whether each quote includes tax, permits if required, and a written workmanship warranty.
Regional pricing and add-on charges to check
Urban areas and high-cost coastal markets may run 10%-25% above typical national ranges because of labor rates, disposal fees, and access limits. Rural bids may be 5%-15% lower, but travel charges or limited contractor availability can offset the difference. Regional differences are not guaranteed, so local itemized bids are the best comparison.
Common additions include $300-$1,500 for discharge-line changes, $500-$2,000 for electrical work, and $500-$5,000 or more for landscaping, steps, patios, or driveway restoration. Permits and inspections vary by municipality and project scope. Request separate prices for optional work so necessary drainage is not confused with upgrades or surface repairs.