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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document that proves that all gas appliances within the house have been checked for safety. Landlords are required to get this check done annually. The gas engineer who checks your property will issue an CP12 (older names for this include Corgi Proforma 12). It is essential to select an accredited engineer to ensure that you receive the most efficient service. It is valid for a year A gas is a document that proves al
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