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How Long Does a Gas Safety Certificate Last? A gas safety certificate is a formal document that confirms the safety operation of the appliances in a home. It must be issued by a Gas Safe registered engineer and is valid for 12 months. Landlords are required to renew their leases annually and give a copy to any new tenants within 28 days of their beginning date. The inspection should be carried out by a licensed and experienced Gas Safe engineer. It is valid for 12 months. Landlords should have all gas appliances and pipe