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Why a Gas Safety Certificate is a Legal Requirement Gas safety certificates are a legal requirement of any property owner who utilizes gas appliances. This inspection makes sure that the appliance is safe to use and is not a threat to the people living within the premises. A gas safety certificate (commonly called a CP12) is evidence that a Gas Safe registered engineer has examined the property. It also contains information about the condition of the appliances, which includes flues. Gas Safety Certificates for Landlords If you own a home which is rent