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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate indicates that a registered engineer has inspected the gas appliances pipes, flues and pipes in your property and discovered that they were safe. It's a legal requirement for landlords to schedule regular inspections. Only an engineer that has been approved by the Gas Safe Register can issue a CP12. The average time for a check is between 30 to 60 minutes. Installation Gas Safety Certificates (also called CP12 Cer