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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate signifies that a registered engineer inspected the gas appliances, pipes and flues in your home and found them safe. It's a legal requirement for landlords to arrange regular checks. Only an engineer who has been vetted by the Gas Safe Register can issue a CP12. The tests usually last between 30 and 60 minutes. Installation Gas Safety Certificates, also referred to as CP12 certificates, are legal documents