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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a document which shows that all gas appliances in the house have been tested 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). It is essential to select an accredited engineer to ensure you get the best service. Valid for one year A gas safety certificate shows that your appliances a
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