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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 an Gas Safe registered engineer and lasts for a period of 12 months. Landlords are required to renew their certificates every year and provide copies of the certificates to new tenants within 28 days from their beginning date. The inspection should be carried out by a trained and qualified Gas Safe engineer. It is valid for 1