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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate means that a registered engineer had inspected the gas appliances as well as the flues, pipes and pipes within your property and found them safe. It is a legal requirement for landlords to schedule regular inspections. Only an engineer that has been approved by the Gas Safe Register can issue a CP12. Checks usually take between 30 to 60 minutes. Installation Gas Safety Certificates, also known as CP12 certifica