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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 checked for safety. Landlords are required to have this check done annually. The gas engineer who checks your home will issue an CP12 form (previously called Corgi Proforma 12). To ensure the best service, it's crucial to choose a registered engineer. It is valid for a year A gas safety certificate is a document that proves that appliances are safe for
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