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The Importance of a Landlord Gas Safety Certificate A gas safety certificate issued by a landlord is proof that a qualified engineer who has tested and checked the gas appliances within a property. The landlord must give a copy to tenants who are currently in the property within 28 days, and new tenants before they move in. A digital safety report for gas can be kept on your tablet, smartphone or laptop. It shows the unique identifier of the engineer who performed the check.