The cost of concrete

Do you have to worry about drainage? snow load? A slab can start to slide off hills. Retaining wall on the downslope with proper drainage, ie perforated pipe buried along the base of the retaining wall can be of use to make sure some underground river doesnt eff you. Maybe something to consider.

I had a 24x36 slab with footings, finish smooth, 4' rockery x 36' long (retains driveway on one side) and a **** ton of 5/8 minus, all work and excavation for 13K-14K in 2005ish. I had another quote at the time from a one/two man show for the same work for 17K and he was astonished that the other guy could do it for that cheap. dos cents.