Homewyse French drain estimates can help set a baseline, but the cost to install a French drain commonly runs about $15-$75 per linear foot, depending on depth, soil, access, and where water must discharge. A straightforward 100-foot yard drain may cost around $3,500, while difficult excavation or an interior basement system can raise the total substantially.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Exterior French drain | $15 per linear ft | $35 per linear ft | $75 per linear ft | Trench, aggregate, pipe, filter fabric, and typical installation |
| 50-foot exterior run | $750 | $1,750 | $3,750 | Assumes ordinary yard access and no major outlet work |
| 100-foot exterior run | $1,500 | $3,500 | $7,500 | Excavation depth and finish restoration affect totals |
| Interior basement drain | $40 per linear ft | $70 per linear ft | $120 per linear ft | Often includes concrete cutting, drainage channel, and sump connection |
Assumptions: U.S. residential pricing in USD; ordinary materials and access; estimates vary by local labor rates, drainage design, and finish restoration.
What a Homewyse French Drain Estimate Usually Covers
Homewyse provides location-adjustable estimating data, not a guaranteed contractor quote. The figure depends on the selected project description, local labor and material assumptions, job size, and estimate date. A homeowner should use it as a starting point, then confirm that a contractor’s proposal describes the same system and work scope.
For an accessible exterior yard, a practical planning range is $15-$75 per linear foot, with many standard installations near $25-$45 per foot. A 100-foot run at $35 per foot would total about $3,500 before unusual permitting, extensive landscape repair, or a complex outlet. Small projects may cost more per foot because mobilization and equipment charges are spread across fewer feet.
Typical exterior specifications include a trench roughly 12-24 inches deep, perforated pipe around 4 inches in diameter, washed gravel, and filter fabric. A deeper foundation drain, a route through rocky ground, or a line connected to a sump pump requires a different estimate. Compare Homewyse and contractor estimates only after matching drain type, length, depth, discharge, and restoration.
How Excavation, Pipe, and Gravel Shape the Quote
Contractors may quote a single installed rate or separate labor and materials. The breakdown below gives broad budgeting ranges for an ordinary exterior project; it is not a fixed national price list. Component rates can overlap when a contractor bundles trenching, pipe placement, and backfill into a per-foot installation charge.
| Quote component | Typical price | What it covers | Cost note |
|---|---|---|---|
| Excavation and backfill labor | $8-$30 per linear ft | Trench digging, grading, and soil replacement | Higher for deep, rocky, or restricted sites |
| Pipe, fabric, and fittings | $3-$12 per linear ft | Perforated pipe, filter cloth, connectors | Pipe diameter and material grade change price |
| Washed gravel | $4-$15 per linear ft | Drainage stone around the pipe | Amount depends on trench width and depth |
| Equipment and delivery | $150-$800 per job | Mini excavator, hauling, and material delivery | May appear as a minimum or mobilization fee |
| Landscape restoration | $2-$15 per sq ft | Seed, sod, mulch, or limited hardscape repair | Full patio or driveway replacement costs more |
Removal of existing concrete, buried utilities, or mature plantings may be listed separately rather than included in the drain rate. Some estimates also add disposal fees for hauled soil. Ask whether the quote includes a discharge point, cleanouts, and finish grading, since those details can shift the total without changing the listed linear-foot rate.
Typical labor pricing: approximately $50-$100 per worker-hour, with crew size and equipment included differently by contractor.
A low per-foot price may omit delivery, disposal, outlet work, or lawn repair. Request a written scope that labels each item as included, excluded, or an allowance.
Why Trench Depth and Soil Type Change the Price
Length matters, but trench dimensions and ground conditions can be just as important. A shallow 12-inch yard drain in loose soil takes less excavation than a 24-inch line near a foundation. Moving from a narrow trench to a wider stone bed increases excavation, gravel volume, fabric, and labor, even if the pipe length stays the same.
Soil affects production speed. Loose, dry soil is generally less costly to dig than dense clay, compacted fill, or ground containing roots and rocks. Rock excavation can add roughly $10-$40 or more per linear foot, depending on whether the crew can use an excavator attachment or must cut and remove rock. Hand digging around utilities or delicate landscaping can also add labor time.
Drain capacity and discharge design create further differences. A 4-inch perforated pipe is common for many residential yard applications, while a larger pipe, multiple branches, or a sump connection can increase material and fitting costs. A run longer than about 100 feet may need additional cleanouts or careful slope planning; a flat or uphill route may require a different system or pump rather than a basic gravity drain.
Foundation drainage may need deeper excavation and protection near the footing. Before digging, utility locating is essential; local requirements and site conditions determine the process. When comparing bids, check trench depth, width, pipe diameter, gravel coverage, and slope—not just total footage.
How Many Crew Hours a 50- or 100-Foot Run Takes
A straightforward exterior installation of 50 feet may take a small crew about one day, while 100 feet can take one to three days. These are broad scheduling estimates, not a promise: machine access, soil, trench depth, weather, and restoration work determine actual duration. A crew may finish digging quickly but need extra time for hauling soil, connecting an outlet, or replacing sod.
Contractors commonly price the job by linear foot or as a minimum project charge rather than billing each worker-hour directly. For planning, labor at roughly $50-$100 per worker-hour can help explain a quote, but equipment, insurance, overhead, and travel may be built into the installed rate. For example, a three-person crew working eight hours represents 24 labor-hours, or about $1,200-$2,400 at those hourly rates, before materials and equipment.
Interior basement work is slower and more disruptive. Crews may need to remove a strip of concrete around the perimeter, excavate beside the footing, install a drain channel, and connect a sump basin. That scope can take several days, and moving stored belongings or protecting finished rooms may be excluded from the contractor’s price.
Ask whether the schedule includes restoration and cleanup, not only trench installation. A quote with a lower labor allowance may leave the homeowner responsible for reseeding, replacing pavers, or arranging soil disposal.
Three Example Quotes for Different Drain Projects
These examples illustrate how scope changes the price. They assume ordinary residential work and are not substitutes for site-specific bids. The low and high ends reflect access, local rates, excavation conditions, and the amount of restoration included.
| Project example | Assumed scope | Estimated total | Approximate unit rate |
|---|---|---|---|
| Short yard run | 50 ft, 12-18 in deep, open lawn, simple outlet | $1,200-$2,800 | $24-$56 per ft |
| Standard perimeter run | 100 ft, 18-24 in deep, 4-in pipe, gravel and fabric | $2,800-$5,500 | $28-$55 per ft |
| Basement perimeter system | 100 ft of interior channel, concrete cutting, sump connection | $6,000-$12,000 | $60-$120 per ft |
A difficult exterior site can exceed the standard example if machinery cannot reach the trench, soil must be hauled away, or the drain crosses a driveway. The basement example assumes a drainage channel and sump connection, but not necessarily a new pump, electrical circuit, finished-wall repairs, or extensive waterproofing. Each of those should be priced separately.
Use project examples to spot missing scope rather than treating the midpoint as a guaranteed price. A contractor should explain why a bid is materially below or above similar local estimates.
Where Regional Labor Rates Push French Drain Prices
Labor, disposal, and equipment rates vary by metro area and distance from suppliers. As a broad budgeting adjustment, dense coastal metros and high-cost urban markets may run 15%-35% above a national midpoint. Smaller towns and rural areas may be 5%-20% below it, although travel charges and limited contractor availability can offset lower hourly rates.
Local soil and climate also matter. Clay-heavy areas may require more excavation or a carefully designed outlet, while rocky terrain can make digging substantially slower. In regions with frequent heavy rain or a high water table, drainage plans may need more capacity or a sump system. Those conditions affect design and scope, not merely the hourly labor rate.
Permits and discharge rules are local. Some jurisdictions regulate where stormwater can flow, require inspections, or restrict connections to public systems. Permit and inspection charges may range from about $50 to $500 or more when applicable; many simple yard drains do not require a permit, but the homeowner should verify local rules before work starts.
For a useful Homewyse comparison, enter the project location and use a date-current estimate, then get at least two local bids with the same specifications. Regional averages are most useful as a check on labor and materials, not as a replacement for a site visit.
When Sump Pumps, Cleanouts, and Removal Add Charges
A gravity drain needs a suitable low outlet. If the yard cannot drain away from the house, a contractor may recommend a sump basin and pump, adding roughly $800-$3,000 for common equipment and installation. Electrical work, backup power, or a long discharge line can raise that amount. The correct design depends on elevation, water volume, and local discharge rules.
Cleanouts can make future flushing or inspection easier. A basic cleanout may add about $50-$200 each, depending on access and fittings. A catch basin or surface inlet often adds $150-$600 per unit installed. These accessories can be useful where runoff concentrates, but adding them without a clear drainage purpose increases cost without necessarily solving the underlying problem.
Demolition and disposal are common sources of quote changes. Cutting and removing concrete or asphalt may cost about $5-$15 per square foot, excluding replacement finishes. Soil hauling can add $200-$1,000 or more for a small residential job, depending on volume, disposal fees, and truck access. Moving shrubs, irrigation lines, or fencing may involve separate charges.
Interior systems can also require a new sump pump, basin, alarm, or discharge piping. Ask for separate prices for each item and confirm whether the existing pump is being reused. Separate necessary drainage components from optional upgrades before approving the total.
How to Lower the French Drain Price Without Weakening It
Keep the route as short and direct as the drainage plan allows. Every additional branch, difficult turn, or extra foot increases digging and materials. Before requesting bids, mark wet areas, downspouts, and possible discharge points; a contractor can then determine whether one drain line can address the problem or whether the proposed scope is broader than necessary.
Compare at least three written estimates using the same length, trench depth, pipe diameter, gravel specification, and outlet plan. Check whether each includes equipment, spoil removal, cleanup, and lawn repair. A low bid may reflect a narrower trench or less restoration, while a higher bid may include items that another contractor has left out. Request unit prices for added footage and rock excavation.
Schedule work during a period when the site is accessible and contractors are not facing urgent storm-related demand. Avoid paying for premium stone, oversized pipe, or extensive accessories unless the drainage design calls for them. Standard 4-inch pipe and suitable washed aggregate are often sufficient for a typical residential yard, but the final specification should match the site and expected water flow.
Do basic preparation where safe: clear movable yard items, identify irrigation equipment, and arrange access for machinery. Do not excavate near utilities or change the planned grade without professional direction. Cut unnecessary restoration and scope—not trench depth, filter materials, or outlet design needed for reliable drainage.
If the problem is limited to a clogged or damaged section, ask whether a targeted repair is practical before replacing a long drain run. A small repair may cost a few hundred dollars to more than $1,000 depending on excavation and access, while a full replacement is justified when pipe failure, poor slope, or widespread clogging affects most of the system.