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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 facilities. The file is released by a certified engineer on the Gas Safe Register and confirms that all devices are safe. The price of a gas evaluation varies depending upon where you live and how numerous devices require checking. The engineer who visits your property will check that they are physically steady and safely fitted to the pipework, as well as screening flues, c