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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate indicates that an engineer who is registered has inspected your property's gas appliances, pipework and flues and determined them to be safe. It's a legal requirement for landlords to schedule regular inspections. Only an engineer who has been vetted by the Gas Safe Register can issue a CP12. The average time for a check is between 30 and 60 minutes. Installation Gas Safety Certificates (also called CP12 Certificates) are legal docum