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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document that proves that all gas appliances in the house have been tested for safety. This check is required by landlords each year. The gas engineer who inspects your property will issue an CP12 (older names for this include Corgi Proforma 12). It's important to choose an engineer who is registered to ensure you are getting the best service. Valid for a period of one year A gas safety certificate is a document that shows that your appliances are safe to use. It i