Most people call us about a patio for one of two reasons. Either there's bare ground out back they want to use, or the old slab has cracked, tipped toward the house or turned into a puddle every time it rains. That second kind usually failed from underneath, because the dirt settled or the water had nowhere to go. That's where we start.
Size moves the price most. After that it's how thick the slab needs to be, how much digging and base the ground calls for, whether there's an old slab to break out, how close we can get a truck, and the finish you pick. Your estimate puts your own figure in writing, so you're not guessing from a number online.
The schedule turns on weather, on whether your address needs a permit and inspections, and on curing. That's the wait while fresh concrete gains strength, kept damp so it doesn't dry out too fast, before you put weight on it.