A Gas Safety Certificate verifies that a completed, connected installation or part gas installation is safe to use, on the grounds that it is safe and complies with the Gas (Safety and Measurement) Regulations 2010 (GSMRs). Where it relates to an existing gas installation, it verifies that it has not affected the safety of any other part of the installation.
Regulations requires a Gas Safety Certificate for all gasfitting, after the work has been completed and connected. The person doing the connection, or their supervisor if they were working under supervision, must issue a Gas Safety Certificate if they are satisfied the installation or part of an installation is safe to use, and has not adversely affected any other part of the gas installation.