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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 and fittings within the house have been checked for safety. This inspection is required by landlords every year. The gas engineer that inspects your property will issue an CP12 (older names for this include Corgi Proforma 12). To ensure you receive the best service, it's important to select a registered engineer. Valid for a period of one year A gas safety certificate is