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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document that indicates that all gas appliances and fittings in 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). To ensure the best service, it's crucial to choose an engineer who is registered. It is valid for a year A gas safety certificate is a document