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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 in a house have been tested for safety. Landlords must have this inspection done every year. The gas engineer who checks your property will issue an CP12 (older names for this include Corgi Proforma 12). It is important to select a registered engineer to ensure you are getting the best service. Valid for a period of one year A gas safety certificate proves all of y
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