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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 a house have been tested for safety. Landlords are required to get this check done annually. The gas engineer who will inspect your home will issue an CP12 form (previously known as Corgi Proforma 12). to choose a registered engineer to ensure you get the best service. Valid for a period of one year A gas safety certification is a doc
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