7 Things To Ask A Gas Line Installation Contractor Before Hiring Them. 7 Important Things To Ask A Gas line Installation Contractor (Or Any Contractor) Before Hiring Them. 1) First and foremost when considering a Gas Line Installation Contractor; Are they licensed & insured?  Are they bonded for your state?  This is an absolute MUST … Continue reading 7 Things To Ask A Gas Line Installation Contractor Before Hiring!