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How Long Does a Gas Safety Certificate Last? A gas safety certification is a document that shows that all gas appliances within the home have been tested for safety. Landlords are required to have this check done annually. The gas engineer who checks your property will issue an CP12 (older names for this include Corgi Proforma 12). To ensure you receive the most efficient service, it's essential to select a registered engineer. Valid for a period of one year A gas safety certification is a