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The Importance of Gas Certificates for Commercial Buildings A gas certificate, also referred to as a landlord's safety report (CP12) is proof that the appliances and flues of a property have been inspected by a Gas Safe-registered engineer in the last 12 months. Landlords are legally bound to provide their tenants with this proof. These certificates give peace of mind for landlords as well as tenants. They ensure that the buildings comply with security and health standards