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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document that indicates that all gas appliances and fittings in the home have been inspected for safety. Landlords are required to have the check annually. The gas engineer who inspects your property will issue an CP12 (older names for this include Corgi Proforma 12). It is essential to select a registered engineer to ensure you are getting the best service. Valid for a period of one year A gas safety certificate is a docu