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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 pipes, flues and pipes in your home and discovered that they were safe. It's a legal requirement that landlords to conduct regular checks. Only an engineer that has been approved by the Gas Safe Register can issue a CP12. The tests typically take between 30 and 60 minutes. Installation Gas Safety Certificates (also known as CP12 Certificates) are legal documents that confirm that a property’s gas appliances and chimneys have