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