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How Long Does a Gas Safety Certificate Last? A gas safety certification is a valid document that affirms that the appliances located in the property are safe to use. It must be issued by an Gas Safe registered engineer and is valid for 12 months. The landlord must renew their leases every year and provide a copy of the certificate to new tenants within 28 days from their start date. The inspection should be carried out by a trained and qualified Gas Safe engineer. It lasts for 12 months. Landlords mus