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Gas Certificates For Landlords and Commercial Establishments A gas certificate, or CP12, is a legal requirement for landlords and owners of commercial establishments. The file is released by a certified engineer on the Gas Safe Register and validates that all devices are safe. The price of a gas assessment differs depending on where you live and the number of devices require monitoring. The engineer who visits your home will check that they are physically steady and securely fitted to the pipework, along with s