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How Long Does a Gas Safety Certificate Last? A gas safety certificate confirms that all gas appliances and fittings within the house have been checked for safety. Landlords must have the check annually. The gas engineer who checks your property will issue a CP12 (older names for this include Corgi Proforma 12). To ensure the best service, it's crucial to choose a registered engineer. Valid for a period of one year A gas safety certification is a document which proves that app