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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 home have been inspected for safety. Landlords are required to have the check annually. The gas engineer who checks your home will issue the CP12 form (previously called Corgi Proforma 12). It is important to select an engineer who is registered to ensure you get the most efficient service. It is valid for one year A gas safety certificat