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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 and flues in your property and discovered that they were safe. Landlords are required to conduct regular inspections. Only an engineer who has been vetted by Gas Safe Register is able to issue an CP12. The tests usually last between 30 minutes and 60 minutes. Installation Gas Safety Certificates, also referred to as CP12 certificates, are legal doc