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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a formal document that confirms the safe operation of a property's appliances. It is 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 to any new tenants within 28 days from their commencement date. The inspection should be performed by a licensed and experienced Gas Safe engineer. It is valid for 12 months. Landl