A 40×60 concrete slab (2,400 sq ft) costs between $16,800 and $33,600 installed in the US, with most homeowners and commercial builders paying an average of $21,600 to $26,400 ($9 to $12 per square foot) for a full turnkey 5″ to 6″ slab with excavation, vapor barrier, #4 rebar grid, and power-trowel or broom finish.
A 40×60 slab is a common foundation size for commercial metal buildings, large barns, hangars, auto shops, and barndominiums. It requires roughly 30 to 45 cubic yards before waste. Placement may use direct truck chutes, a line pump, or a boom pump depending on access, reach, schedule, and site protection.
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Range breakdown
| Component | Low | Average | High |
|---|---|---|---|
| Base installation | - | - | - |
| Thickness adjustment | - | - | - |
| Finish adjustment | - | - | - |
| Calculated subtotal | - | - | - |
40×60 Concrete Slab Cost by Specification (2,400 Sq Ft)
| Use Case | Thickness | Volume (Yards) | Turnkey Price Range | Average Cost |
|---|---|---|---|---|
| Agriculture / Hay Storage | 4 inches | 30.0 cu yd | $16,800 – $24,000 | $20,400 ($8.50/sq ft) |
| Standard Workshop / Barndo | 5 inches | 37.0 cu yd | $21,600 – $28,800 | $24,000 ($10.00/sq ft) |
| Heavy Commercial / Auto Lift | 6 inches | 44.4 cu yd | $26,400 – $36,000 | $30,000 ($12.50/sq ft) |
| Monolithic Foundation (w/ Footers) | 6″ + 12″ Edge | 52.0 cu yd | $31,200 – $44,000 | $36,500 ($15.20/sq ft) |
40×60 Slab Key Cost Factors & Material Takeoff
- Ready-Mix Concrete: 4 to 5 full concrete trucks ($4,500 – $7,200 delivered material).
- Excavation & Heavy Grading: Skid-steer / mini-excavator site cut & fill ($2,000 – $4,500).
- Compacted Base Stone (4″–6″ ABC): 35 to 45 tons of crushed gravel ($1,400 – $2,500).
- Rebar Grid (#4 1/2″ @ 16″ OC): ~3,600 linear feet of rebar elevated on 2″ chairs ($1,800 – $2,800).
- Concrete Placement: Direct chute, conveyor, line pump, or boom-pump access allowance where trucks cannot safely reach the placement area ($0 – $1,800+ depending on method).
- Finishing Crew: 5–6 person crew with walk-behind or ride-on power trowels ($8,000 – $13,000).
40×60 Commercial Slab Scope Checklist
Do not compare quotes on square-foot price alone. Each bid should identify subgrade proof-rolling, unsuitable-soil replacement, aggregate depth, compaction testing, vapor barrier, insulation, reinforcement, thickened edges, column pads, embeds, drains, placement equipment, finish class, curing, joint layout, testing, and winter or hot-weather procedures.
Coordinate the slab with the metal-building or structural plan before pricing. Column reactions, vehicle lifts, masonry walls, loading areas, and equipment pads can require local thickening that is not represented by a uniform 4-, 5-, or 6-inch calculator input. Use the ready-mix estimator to separate material and delivery charges from labor and equipment.
Frequently Asked Questions About 40×60 Slabs
How many cubic yards of concrete are in a 40×60 slab?
A 40×60 slab at 4″ depth requires 29.6 cubic yards. At 5″ depth, it requires 37.0 cu yd, and at 6″ depth, it requires 44.4 cu yd (48.8 cu yd with standard 10% waste allowance).
Does a 40×60 slab require a concrete pump truck?
Not always. Direct chute access may work when trucks can safely reach the slab perimeter and the placement sequence is planned. A conveyor, line pump, or boom pump may be preferable when reach, soft ground, reinforcement, walls, schedule, or site protection limits truck access. Ask bidders to state the planned placement method and cost.
What rebar size is required for a 40×60 barndominium slab?
#4 rebar in a regular grid is a common estimating assumption, not a universal design. Barndominium column loads, walls, vehicle lifts, soil, frost depth, shrinkage strategy, and local code can change bar size, spacing, slab thickness, and footing details. Use the calculator for budgeting and the engineered building plan for construction.
Related Tools
- Concrete Slab Cost Calculator
- Rebar & Steel Grid Calculator
- Concrete Pump Truck Cost Guide
- Ready-Mix Concrete Cost Per Yard
Sources and Update Policy
Installed-price assumptions use ConcreteNetwork’s concrete pricing reference as a public baseline and are checked monthly. See our estimation methodology.
Estimate transparency
How this estimate was prepared
- Prepared by
- GoHomeCost Cost Data Team
- Last reviewed
- August 24, 2026
- Update cycle
- Public price inputs checked monthly
Calculation method: Project quantity is multiplied by editable low, typical, and high unit rates. Selected location adjustments, waste, fixed charges, and minimum-job rules are then applied and shown in the result.
Public references used on this page:
This is a planning estimate, not a quote or structural specification. Check product yields, local code, site conditions, and written contractor bids before purchasing materials or building.
Read the full methodology Report a price or calculation issue