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Why Landlords Need a Gas Safety Certificate All landlords must make sure that their properties are equipped with an active Gas Safety Certificate (CP12) in place. This certification proves that a certified engineer has checked all gas appliances and flues within a property, and has confirmed that they are safe to use. Gas Safe engineers all carry the same ID card, which is a photo. You should ask to verify it prior to any work that occurs on your property. This card confirms an engineer's registration on the Gas Safe Register. Safety Certifica