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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 the house have been tested for safety. This inspection is required by landlords every year. The gas engineer who will inspect your home will issue a CP12 form (previously known as Corgi Proforma 12). It is important to select an accredited engineer to ensure you get the best service. Valid for a period of one year A gas safety certificate confirm