text: how much does it cost to build a firepit? my friends and i are in college and are moving into a house next fall, and we are planning on building a firepit out of flagstone and cement it about a ft' into the ground in the backyard.  it's probably going to be about 3' tall, and about 5'+ across.  does anyuone know how much all that would cost and any building advice for that project? it all depends on where you get your material. remember to call and have all your under ground pipes and wires marked. to get a round shape i used a piece of pvc, it was probably 3' diameter, that i got from a farmer that used it to supply water to his fields. i just dug the hole a bit bigger than the pvc and filled with concrete in between the ground and the pvc. i then put a brick they sell at wal-mart around the top edge before it dried. it looks like its all brick. i stacked them about 3 bricks high and used the concrete as a mortar. then about a week later when it was all dry i mixed up some more concrete and put some in the bottom (removed the pvc first) and let it set. about a week later we used it. and we used it a lot. we also had expanded metal cut to the size of the pit so it can double as a grill. just remember to have handles welded on if you do this. this is so when you need to add wood you can remove the metal with gloves. smores + fire pit + beer = a good time. i bet you could get something similar to the pvc i used, like maybe culvert. you could also just do it with all brick. i hope this helps. good luck. and remember to get it how you want it the first time. i ended up digging up the one i described to build a bigger one. and the second time around it was pricey. to buy all new materials it could vary in price depending on how you choose to do it.