Asked on Apr 12, 2018
How much to build a cement garage floor 20x24ft
by
Greg Kelly
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Well, that depends on what concrete is going for in your area, how much earth-moving needs to be done and whether or not you're doing the work yourself of having a crew come in and do it. In my area on the Gulf Coast I had a partial driveway put in 20x12 and it was close to $5k. You can kind of guestimate from there...
Call your local contractor for an estimate. It should be free. That will give you a starting point.
Check local codes and get your building permit first. Have utilities been located? Electrical, plumbing gas?
Here are some great cost calculators.
https://www.improvenet.com/a/concrete-slab-costs-types
https://www.improvenet.com/r/costs-and-prices/cement-slabs
https://www.everything-about-concrete.com/concrete-slab-cost.html
https://www.hunker.com/12610534/the-average-cost-per-square-foot-of-a-concrete-garage-floor
Cement is a powder that comes in a bag - do you mean concrete? You need a concrete slab at least 4" thick and it should have wire mesh in it to provide structural strength and minimize excessive cracking. You can calculate the volume of concrete yo will need and the sq ft of mesh needed. Usually there are small contractors that do only concrete work and could give you a price for installation and the finish you want.