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How Long Does a Gas Safety Certificate Last? A gas safety certificate indicates that all gas appliances and fittings within the house have been checked for safety. This inspection is required by landlords each 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 engineer who is registered to ensure you are getting the best service. It is valid for one year. A gas safety certificate is a doc