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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document which shows that all gas appliances within the house have been checked for safety. This is a requirement for landlords each 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 most efficient service, it's essential to select a registered engineer. Valid for one year A gas safety certificate proves all of your appliances are safe to use. It is a must-have document for landlords who rent pr