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How Long Does a Gas Safety Certificate Last? A gas safety certificate is an official document that confirms the safe operation of appliances in a house. It must be issued by a Gas Safe registered engineer and is valid for 12 months. Landlords are required to renew their certificates annually and provide a copy of the certificate to any new tenants within 28 days from their commencement date. The inspection must be carried out by a Gas Safe engineer who is competent and skilled. It lasts 12 months Landlords should ensure that all gas appliance