Most calls start with a stoop that's cracked, tipping away from the door or sunk at one corner. Usually the concrete itself isn't the real problem. It's what's under it. A lot of old stoops were set with little or nothing solid underneath, so they move when the ground does, and new steps built the same way end up doing the same thing.
The price moves with how many steps you need, whether we go precast or poured, whether footings have to be added and whether part of the sidewalk at the bottom comes out too. The schedule turns on the city's permit review when one is needed and on curing, the days new concrete needs to harden before you use it. Your written estimate puts each of those on its own line.