Most calls start with a floor that's cracked, sinking at one corner or chipping on top. Others come from a space that needs concrete for the first time, like a shop, a garage or a room addition. Either way, our crew starts with the subgrade, the packed soil the slab sits on, because a floor is only as steady as what's under it.
Several things move the price. They include the size of the floor, how much digging and base work the ground needs, the reinforcement, whether a moisture barrier goes under it for flooring on top, and how close we can get the truck. The schedule turns on the prep, any permit the job needs and a pour day with workable weather. Your written estimate spells out both for your floor.
California puts this work under the state's C-8 concrete contractor classification, the license for forming, pouring and finishing flat concrete. Below I've laid out what decides how a floor looks a few years from now, so you can judge any contractor's plan before you sign, ours included.