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How Long Does a Gas Safety Certificate Last? A gas safety certification is a document that proves that all gas appliances in the home have been checked for safety. This is a requirement for landlords each year. The gas engineer who will inspect your home will issue an CP12 form (previously called Corgi Proforma 12). To ensure that you get the best service, it's important to select a registered engineer. It is valid for one year A gas safety certificate shows that your applia