How much would a contractor charge for a 15'x8' rebared 3" thick concrete floor?
Your probably looking at between $ 1,800 and $ 2,400 just to set the steel and concrete and finishing.
Your "Packed" Min. 4" of gravel and formwork would be extra on top of that. Probably another $ 800 to $ 1,200.
Do it right the first time. do your homework. Get a few estimates.
If contractor is to supply and install, including excavation, gravel, form it, tie rebar, pour concrete and finish it. My guess you'd be looking at $1200-1500 retail. (120 sq ft.) Smaller jobs are just as much work as some bigger ones, same process, so contractors usually charge a little more for the small jobs.
As an example of the costs, a job that I did (Hasaca Construction 613-897-4890) was a 10'x24' outdoor dumpster slab. The slab was 6 inches thick with wire mesh (not rebar) tied and tented. The ground was excavated and base was properly prepped. Including the forms, the job was $4000. The delivered cement, mesh and forms cost about $1200-$1300. This was a full 2 days of grunt work to get everything completed.
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