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How Does a Gas Safety Certificate Last? A gas safety certificate is a formal document that confirms that the appliances in a property are safe to use. It is issued by a Gas Safe registered Engineer and is valid for 12 months. Landlords are required to renew their certificates every year and give a copy to any new tenants within 28 days of their beginning date. The inspection should be conducted by a qualified and experienced Gas Safe engineer. It lasts 12 months Landlords