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The Importance of a Landlord Gas Safety Certificate A landlord gas safety certificate is proof that a licensed engineer has checked and tested every gas appliance in a property. The landlord must give a copy to current tenants within 28 days and new tenants prior to their move in. A digital gas safety report can be stored on your smartphone, tablet or PC. It will show the unique identifier of the person who carried out the check. This can be an electronic sign, name or payro