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Gas Safety Certificate - A Legal Requirement For Landlords A gas safety certificate (also called a CP12) is an official document that landlords have to be able to verify the safety of tenants and comply with regulations. The process of obtaining a gas safety certificate is easy and inexpensive, and can be combined with a boiler service. CP12 inspections cost between PS60 and PS90. Prices differ based on the region and number of appliances. Costs A