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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate indicates that a registered engineer had inspected the gas appliances pipes, flues and pipes in your property and found them safe. Landlords are required to conduct regular inspections. Only an engineer who has been verified by the Gas Safe Register is able to issue an CP12. The tests typically take between 30 minutes and 60 minutes. Installation Gas Safety Certificates (also known as CP1