Basement Excavation Cost Calculator
Digging a basement costs $40-$80 per cubic yard in most US markets, with another $10-$15 per cubic yard for spoil haul-off. This basement excavation cost calculator sizes the hole including working space, applies soil and regional factors, and sums excavation, haul-off, and backfill import so you can compare excavator bids apples-to-apples.
Basement Excavation Cost per Cubic Yard (2025)
| Soil Type | Labor + Equipment | Haul-Off | Total per CY |
|---|---|---|---|
| Normal / sandy | $40-70 | $8-15 | $48-85 |
| Heavy clay | $55-90 | $10-15 | $65-105 |
| Rocky / ledge | $70-140 | $12-20 | $82-160 |
| Wet / high water | $60-100 | $10-15 | $70-115 |
Typical Basement Excavation Cost by Size
For a 9 ft deep dig with 1 ft working space all around on normal soil, average region:
| Interior Footprint | Excavation Volume | Total Cost |
|---|---|---|
| 24 x 30 ft | ~83 cu yd | $6,500-9,500 |
| 28 x 40 ft | ~130 cu yd | $9,500-14,500 |
| 32 x 48 ft | ~179 cu yd | $13,000-20,000 |
What Drives Basement Excavation Cost
- Depth: going from 8 ft to 10 ft deep adds 25% more volume and often requires shoring.
- Soil: rocky ground can double cost if a hydraulic hammer or blasting is needed.
- Water table: wet sites need a dewatering pump at $500-1,500/day.
- Access: tight suburban lots add 15-25%; excavators charge for truck spotting and reach.
- Haul distance: if the closest dump site is over 30 minutes away, haul-off jumps 50%.
- Permits and inspections: $200-1,500 depending on jurisdiction.
- Utility strikes: an undocumented gas or water line can stop the job for days.
Process and Timing
A typical 1,100 sq ft basement takes 2-4 days of excavation with a single 20-30 ton excavator and 2-3 dump trucks. Days 1-2: dig the hole. Day 3: trim the sides and level the floor for the slab. Day 4: cleanup and first dump-truck haul-off. Footings and foundation pour follow immediately so the hole is not open through heavy rain.
Hidden Basement Excavation Costs
- Temporary shoring: required on deep digs near neighbors ($2,000-8,000)
- Tree root removal: $300-1,000 per large tree
- Sump / drainage excavation: $500-1,500 additional
- Topsoil stripping + stockpiling: $500-2,000 (charged separately)
- Finish grading: $1,000-2,500 after backfill compaction