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Why Landlords Should Get an Annual Gas Safety Check A CP12 certificate indicates that an engineer registered with the company has examined your property's gas appliances, pipes and flues and found them be safe. It's a legal requirement that landlords to schedule regular inspections. Only an engineer who has been verified by Gas Safe Register is able to issue a CP12. The tests usually last between 30 minutes and 60 minutes. Installation Gas Safety Certificates (also known as CP12