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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 in a home have been checked for safety. This inspection is required by landlords each year. The gas engineer who checks your property will issue a CP12 (older names for this include Corgi Proforma 12). It is important to select an accredited engineer to ensure you are getting the most efficient service. It is valid for one year. A gas safety certificate is a document that confirms that all your appliances are