It depends on whether or not you already have a gas line running from your street to your house. When we did this and some friends of ours (in 2 different states MD & MI) the cost to run the gas to the house was around $3000. To run the line to the fireplace was another $1500 and $2000 respectively. Then there was the cost of the insert which can be as much as you want to spend depending on your choice. We're about to do this again in a new house, but we have gas already and expect the cost to be in the $2000-$3000 range because we will be doing 2 fireplaces. The convenience is worth it and my daughter has asthma, so wood burning is a problem for her. Good luck with your project.