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How Long Does a Gas Safety Certificate Last? A gas safety certification is a formal document that confirms that the appliances in a property are safe to use. It must be issued by a Gas Safe registered engineer and lasts for a period of 12 months. Landlords must renew their certificates every year and provide a copy of the certificate to any new tenants within 28 days of their start date. The inspection must be carried out by an Gas Safe engineer who is qualified and experie