gas line installation cost
1 As a very general estimate, installing gas line costs $20 to $30 per foot. 2  In some areas and circumstances, however, the price could be $75 per foot or more. 3  This price should include the costs of trench digging and all necessary permits, drawings, and inspections.lthough gas line installation is relatively simple, depending on how many gas appliances you already have and the configuration of you existing gas lines, some situations could be more complicated. At any rate, installing gas lines is dangerous, and youâre going to need to hire a professional.