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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 a property's appliances. It is issued to you by an Gas Safe registered Engineer and is valid for a period of 12 months. Landlords are required to renew their certificates each year and give an original copy of the certificate to any new tenants in 28 days from their beginning date. The inspection should be carried out by a trained and qualified Gas