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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document that shows that all gas appliances in the house have been checked for safety. Landlords must have this inspection done every year. The gas engineer who checks your home will issue an CP12 form (previously called Corgi Proforma 12). It is important to select an engineer who is registered to ensure that you receive the best service. Valid for one year A gas safety certificate proves all