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How Long Does a Gas Safety Certificate Last? A gas safety certificate is an official document that confirms the safety operation of appliances in a house. It must be issued by a Gas Safe registered Engineer and is valid for a period of 12 months. Landlords must renew their certificates every year and give a copy to any new tenants within 28 days of their beginning date. The inspection should be carried out by a trained and qualified Gas Safe engineer. It lasts for 12 months. La