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The Gas Safety Certificate Grace Period A gas safety certificate is a vital document that is required by law for landlords renting properties that have gas appliances and installations. The certificate, issued by a Gas Safe engineer following an inspection visit, ensures that all installations and appliances meet the necessary standards for occupant safety. Landlords are responsible to have their CP12 checked by an Gas Safe registered engineer every year. They are also required to provide a copy of the report to their tenants. What is a Gas