Drainage rock typically costs $30-$75 per ton or about $40-$100 per cubic yard before delivery, with an average bulk material price near $50 per ton. The cost of drainage rock depends on stone type, order size, delivery distance, and whether a contractor also excavates and installs it.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Bulk drainage rock | $30 per ton | $50 per ton | $75 per ton | Common crushed stone, before delivery |
| Bulk price by volume | $40 per cubic yard | $65 per cubic yard | $100 per cubic yard | Conversion depends on stone density |
| Bagged drainage stone | $5 per 0.5-cu-ft bag | $7 per bag | $12 per bag | Higher unit price; useful for small repairs |
| Delivered small load | $150 | $300 | $600 | Material, minimum load, and distance affect total |
| Installed drainage trench | $20 per linear ft | $45 per linear ft | $100 per linear ft | May include excavation, fabric, pipe, and rock |
What drainage rock costs by ton and cubic yard
For a typical order of clean crushed drainage stone, buyers often pay $30-$75 per ton, with $50 per ton a useful planning average. That works out to roughly $40-$100 per cubic yard. A cubic yard commonly weighs about 1.3-1.5 tons, but rock size, shape, moisture, and quarry grading change the conversion.
For a bulk order, budget about $50 per ton for the stone itself, then add delivery and any placement work. The estimate assumes standard ¾-inch crushed stone or a similar clean aggregate, ordinary access, and a local quarry. Decorative rounded river rock and specialty stone can cost more.
A 10-by-2-foot drainage area covered 6 inches deep uses about 0.37 cubic yard before compaction or waste. Depending on density, that is around 0.5 ton. Small quantities may be billed at a supplier’s minimum, so the actual purchase can cost more than the calculated material amount.
Assumptions: Common U.S. bulk aggregate, standard clean stone, and prices before sales tax; local supplier rates and delivery minimums vary.
How quarry, delivery, and trench charges build the quote
A rock quote may combine material, trucking, unloading, and installation. A low per-ton price does not guarantee a low delivered total: minimum-load charges can dominate a small order, while a large load may require equipment or a suitable unloading area.
| Quote component | Typical price | What changes the charge |
|---|---|---|
| Crushed drainage stone | $30-$75 per ton | Stone grade, quarry, and order quantity |
| River rock or specialty aggregate | $60-$150 per ton | Color, source, size, and sorting |
| Local delivery | $75-$250 per load | Distance, truck size, fuel, and minimum order |
| Bagged stone | $5-$12 per 0.5-cu-ft bag | Brand, packaging, and retailer |
| Excavation and placement labor | $50-$100 per worker-hour | Soil, access, depth, and equipment |
| Disposal of excavated soil | $50-$200 per load | Volume, haul distance, and disposal rules |
Contractors may price a complete French drain or foundation drainage job by the linear foot rather than listing each component. The finished quote can include trench excavation, perforated pipe, filter fabric, rock, grading, and soil disposal. Labor is often the largest variable when access is tight or the trench is deep.
Check whether delivery, unloading, excavation, and disposal are included before comparing two quotes. A $40-per-ton material quote and a $60-per-ton delivered quote may be equivalent if the first adds a separate trucking fee.
Why ¾-inch stone, depth, and access change the price
Rock size and shape affect both price and performance. Clean ¾-inch crushed stone is widely used around perforated drainpipe because its gaps allow water to move while the angular pieces interlock. Smaller gravel may compact more tightly; large stone can leave wider voids but may be harder to handle. Confirm the specified grade rather than comparing prices by the word “gravel” alone.
Project volume is another key driver. A 4-inch layer over 100 square feet needs about 1.23 cubic yards before allowance for uneven ground. At 6 inches, the same area needs about 1.85 cubic yards. Add roughly 5%-10% for minor waste and irregular edges, or more if the trench base is uneven.
Depth can change material needs sharply: doubling a 4-inch layer to 8 inches doubles the rock volume. A narrow 12-inch-wide trench uses less stone per foot than a 24-inch-wide trench, but a deeper excavation can increase labor, soil hauling, and safety requirements.
Access can add cost even when the rock quantity is modest. A truck that cannot reach the work area may need to dump at the curb, followed by wheelbarrow transport or machine handling. Steep slopes, wet ground, buried utilities, roots, and hard soil can also slow excavation or require different equipment.
Regional supply matters as well. Near a quarry, standard crushed stone may cost 10%-25% less than in a distant metro market. Urban delivery can erase that difference through traffic, limited truck access, and higher labor rates. Specialty colors or rounded river stone may cost 20%-60% more than basic crushed aggregate.
How to lower drainage rock costs without weakening drainage
Start by measuring the required area and specifying the intended layer depth and stone grade. Ordering too much creates leftover material and extra delivery cost; ordering too little can trigger another minimum-load charge. For a simple rectangular area, multiply length by width by depth in feet, then divide by 27 to estimate cubic yards.
Keep the drainage design fixed before requesting quotes, and compare the same stone quantity and delivery terms. Ask suppliers for both per-ton and delivered totals, plus the load minimum and any surcharge for a specific drop location.
- Use standard clean crushed stone when it meets the drainage design instead of paying extra for decorative rock.
- Combine separate small projects into one delivery when the sites and timing make that practical.
- Prepare a clear truck route and unloading spot to reduce hand-moving and equipment time.
- Keep excavated soil on-site only when grading plans and local rules allow it.
- Compare a repair of a blocked or damaged drain with full replacement before approving a longer trench.
Do not reduce depth, omit filter fabric, or substitute stone without checking the design. Fine soil can migrate into open stone and reduce drainage capacity. A lower material bill may lead to recurring clogs or water problems if the assembly does not suit the soil and runoff conditions.
How much rock a 20-foot French drain requires
A 20-foot trench that is 12 inches wide and 18 inches deep holds about 1.1 cubic yards of total trench volume. If a 4-inch perforated pipe occupies part of that space and the trench includes a stone bed and cover, the actual rock order may be around 0.8-1.0 cubic yard, depending on the layout and whether stone covers the pipe completely.
At $40-$100 per cubic yard, that quantity represents roughly $32-$100 in rock. A small delivery can raise the material-and-delivery bill to $150-$400. If excavation, pipe, fabric, backfill, and grading are included, a 20-foot installed project may run approximately $600-$2,000, with difficult access or extensive soil removal pushing it higher.
For short drains, minimum delivery and labor charges often matter more than the rock’s per-ton rate. A contractor estimate should identify trench dimensions, pipe and fabric specifications, stone coverage, and disposal so the total can be checked against the scope.
When bagged stone beats a bulk truck delivery
Bagged drainage rock often costs $5-$12 per half-cubic-foot bag, or approximately $270-$650 per cubic yard before tax. That is substantially more per unit than bulk stone, but bags can be economical for a few downspout splash areas, a small sump-pump outlet, or a limited repair where a truck delivery minimum would be excessive.
A cubic yard contains 54 half-cubic-foot bags. At $7 per bag, the same volume costs about $378 before tax, compared with roughly $40-$100 for bulk rock. The tradeoff is easier handling and no truck drop, not a lower material price. Retail bags also vary in size and may contain decorative stone rather than the specified drainage aggregate.
For more than about 0.5-1 cubic yard, compare bulk delivery with bag pricing and handling time. If bags must be moved through a house or carried over a long distance, labor can exceed the delivery charge for a bulk load placed near the work.
What three drainage rock project budgets look like
These examples use typical U.S. pricing and show why quantity alone does not determine the total. Site conditions, local trucking, and contractor scope can shift estimates considerably.
| Project | Rock and unit price | Other work | Estimated total |
|---|---|---|---|
| Downspout bed, 30 sq ft at 4 in. | 0.4 cu yd at $65-$100 per cu yd | $100-$250 delivery or bag handling | $125-$350 |
| 20-ft French drain, 12 in. wide | 0.8-1.0 cu yd at $45-$90 per cu yd | 8-14 labor hours, pipe, fabric, soil removal | $600-$2,000 |
| 100-sq-ft foundation gravel strip, 6 in. | 1.85-2.0 cu yd at $40-$85 per cu yd | Site prep and spreading, if hired | $250-$900 |
For the French drain example, labor at $50-$100 per hour for 8-14 hours alone can run $400-$1,400. The range assumes ordinary excavation and access; rocky soil, utility conflicts, or deeper trenches can increase hours. The foundation strip example excludes major grading, waterproofing, and a new drainpipe.
Example assumptions: Standard crushed drainage stone, small to moderate residential scope, and regional delivery rather than remote-site hauling.
How delivery distance and city rates affect rock prices
Quarry proximity is a major reason prices differ between regions. In rural areas near an aggregate source, a standard stone order may land near the lower end of the material range, although long rural routes can add trucking expense. In dense cities, material may cost 10%-30% more than nearby rural pricing, and delivery can rise further when trucks face restricted access or limited unloading windows.
Across the U.S., a useful planning allowance is $75-$250 for local delivery, but a longer haul, small-load minimum, or specialty truck can push the fee above $300. Ask whether the supplier charges by mile, by load, or by travel time. Also confirm whether the truck can dump directly beside the trench; a second handling step may add $50-$200 or more.
Get at least two delivered quotes for the same tonnage, stone grade, and drop location. Quarry prices are not directly comparable if one quote includes a full truckload and another charges a minimum-load fee. Check whether taxes, fuel surcharges, and weekend or timed-delivery charges are included.
When drainage rock installation needs permits or extra work
Buying rock alone usually does not require a permit, but excavation or drainage changes can be subject to local rules. Permits may apply when work affects a public right-of-way, connects to a storm sewer, alters grading near a property line, or involves substantial runoff changes. Local requirements vary, so a contractor should identify permit and inspection charges before work begins.
Before digging, homeowners should arrange utility locating through the applicable state service, commonly reached by calling 811. Private lines such as irrigation, landscape lighting, or some service runs may not be marked by the public locator. Hand excavation near marked utilities can add time but helps avoid costly damage.
Budget separately for code-related changes, utility conflicts, and water discharge routing rather than assuming the rock quote covers them. A simple material delivery may have no permit fee, while a permitted drainage installation can add roughly $50-$500 in application and inspection charges, depending on the jurisdiction and project scope.