Core Drilling Cost Per Foot in the U.S.: Price Ranges and Drivers 2026
Buyers commonly pay for core drilling by foot with price drivers including hole diameter, rock hardness, depth, equipment type, and access. The core drilling cost per foot varies by project scope and location, so this article provides practical low, average, and high ranges in USD to help budget decisions.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Per-foot price (diameter 2 to 3 inches) | $8 | $12 | $20 | Ground and rock conditions affect the range |
| Per-foot price (diameter 4 inches) | $14 | $22 | $35 | Increases with core sample size |
| Depth impact (per foot beyond 20 ft) | $0.50 | $1.50 | $3.00 | Labor and rig time scale with depth |
| Access and setup fee | $100 | $250 | $750 | Urban sites often higher |
| Site restoration and disposal | $50 | $150 | $400 | Soil, rock, or core sample handling |
Base per-foot costs by diameter and material type
The most common driver is the borehole diameter and the material being drilled. In stable soils, 2–3 inch cores run about $8–$12 per foot; larger 4 inch cores pull $20–$35 per foot. Assumptions: standard soil conditions, typical rock hardness I–III, accessible site, regular business hours.
| Diameter | Material/Soil | Low | Average | High | Notes |
|---|---|---|---|---|---|
| 2–3 in | Silt/Clay | $8 | $12 | $20 | Common residential/utility work |
| 2–3 in | Granite/Hard rock | $12 | $16 | $28 | Rock reinforcement may apply |
| 4 in | Silt/Clay | $14 | $22 | $35 | Higher tooling needs |
| 4 in | Granite/Hard rock | $25 | $30 | $50 | Rig time and stabilization required |
Depth and time: how depth shifts the price per foot
Depth affects labor hours and equipment run-time, typically adding $0.50–$3.00 per foot after the initial 20 ft. For long runs, the marginal cost reflects crew time and logistics. Depth-driven costs require planning for potential drill string wear and boring pauses.
Sample depth scenarios with price implications
Scenario A: 25 ft of 2–3 in core sample in a suburban site — around $12–$20 per foot. Scenario B: 60 ft in granite with 4 in cores — $28–$45 per foot.
Equipment and method: different rigs alter the per-foot pricing
Wet-core drilling, dry-core, and core-drilling without casing have different maintenance and downtime profiles, shifting the per-foot price by about $2–$8 depending on the rig. Choose the method that minimizes unplanned stops for cost control.
Per-rig pricing snapshot
Standard wireline core rigs: $10–$18 per foot; heavy-duty diamond core rigs: $25–$40 per foot in hard formations.
Regional differences within the United States
Prices vary by region due to labor rates, permitting, and accessibility. The West Coast and Northeast typically run higher than the South and Midwest. Always compare regional quotes to capture a typical delta of 10–25% by area.
Permits, inspections, and added charges that affect per-foot pricing
Excavation permits, utility locates, and waste disposal can add $100–$1,000 total. On-site inspection fees may push overall costs higher in regulated municipalities. Factor permit timing into project planning to avoid rush fees.
Labor, crew size, and scheduling influence on per-foot price
Typical crew sizes range from 1–3 workers on a small job to 4–6 for larger projects. Hourly rates vary by region, roughly $75–$125 per hour. Per-foot costs reflect crew efficiency and scheduling gaps. Request a breakdown by crew hours to compare quotes fairly.
Comparison: core drilling vs. alternative methods for similar outcomes
In some cases, wireline coring or coring with pre-drill stabilization can lower overall costs if the goal is material sampling rather than full hole utilization. Evaluate whether a smaller-diameter core or alternative sampling methods meets project needs.
Two real-world quote examples to guide budgeting
Example 1: 30 ft of 2 in core in a suburban site, one-day crew, standard soil — $360–$540 total. Example 2: 120 ft of 4 in core in a rocky hill location, two-day crew, diamond bit — $3,600–$6,300 total. Prices include labor, equipment, and basic disposal.
Practical ways to reduce the core drilling cost per foot
Lock in a precise depth and diameter, compare multiple contractors, choose standard equipment, schedule during off-peak seasons, and bundle with related services like sampling. Small adjustments in scope and timing often yield meaningful savings.