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Gas Safety Certificate - A Legal Requirement For Landlords A gas safety certificate, also referred to as a CP12 certificate is a must-have document that landlords must have in order to ensure the safety of their tenants and comply with rules. Gas safety checks are quick and cost-effective and can be paired with boiler services. Typically, landlords can expect to pay between PS60 and PS90 for the CP12 inspection. Prices vary based on the region and number