A 40x60 slab is 2,400 square feet, which is pole barn and commercial bay territory. At this size the question is less “what does a square foot cost” and more “can the crew and the trucks stay ahead of the concrete.” The math still starts the same way, though.
Example rates times 2,400 square feet
| Finish | Example rate | 40x60 (2,400 sq ft) |
|---|---|---|
| Standard broom | $9 / sq ft | $21,600 |
| Colored | $12 / sq ft | $28,800 |
Example rates, not market data, and worth saying twice at this size: a rate built for 400 square foot patios may not describe your costs on a 2,400 square foot building pad at all. Big open pours change the labor picture, so build the rate for the work in front of you. What to charge per square foot for flatwork covers the method.
The pour is a logistics job
Volume drives everything here. Square feet times thickness in feet divided by 27: about 30 yards at 4 inches, about 44 yards at 6. That is a steady rotation of trucks, timed so fresh concrete never waits on the next load, with enough finishers to work everything that hits the ground. Many contractors split a slab like this into planned sections instead. Do the ordering math carefully with how to figure concrete yardage, because a shortfall at yard 40 is an ugly phone call.
Inside an existing pole building, access adds another wrinkle: if the truck cannot chute to the far corners, a pump enters the picture, and the price should know that before pour day.
Add-ons at this scale are real money
At the example rates: site prep and grading at $2 per square foot is $4,800 across the pad, reinforcement at $1.50 is $3,600, and tear-out of an existing slab at $4 would be $9,600 by itself. On a 40x60 there is no such thing as a small line item, which is exactly why the quote should show every one.
Start with the calculator
The concrete slab cost calculator opens preloaded at 40x60 and reruns the example math for any footprint in seconds.
For the real bid, load your own rates into PriceDesk and quote a slab this size, itemized, from wherever you are standing. The first 14 days are free.