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Gas Safety Certificates For Landlords Gas safety certificates are required by law for landlords. The certificates must be issued prior to the moving in of tenants, and they must be renewed each year. In the event of a non-renewal, it could result in substantial fines. A CP12 is proof that a qualified gas engineer has examined the flues and gas appliances of a building. It also certifies that the appliances meet British safety regulations. Commercial Gas Safety Inspection Cert