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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 within a home have been checked for safety. This inspection is required by landlords each year. The gas engineer who checks your property will issue an CP12 (older names for this include Corgi Proforma 12). To ensure you receive the best service, it's important to choose an engineer who is registered. Valid for a period of one year A gas safety certificate confirms that all your appliances are saf
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