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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 as well as the flues, pipes and pipes within your home and found them safe. It's a legal requirement that landlords to schedule regular inspections. Only an engineer who has been vetted by the Gas Safe Register can issue a CP12. Checks typically take between 30 to 60 minutes. Installation Gas Safety Certificates (also known as CP12 Certificates) are legal documents that prove that the pro