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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document that confirms that all gas appliances and fittings in the house have been checked for safety. Landlords are required to have the check annually. The gas engineer who checks your property will issue an CP12 (older names for this include Corgi Proforma 12). To ensure the most efficient service, it's essential to choose a registered engineer. It is valid for a year A gas safety certificate confirms