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Why Landlords Need a Gas Safety Certificate CP12 Anyone who leases out a portion of their property must have a CP12 gas safety certificate. This ensures that all appliances are safe and comply with the law. Landlords must also keep records of any inspections. This can be useful should they ever decide to sell their property. Legal Requirements Gas Safe registered engineers must inspect and issue a gas safety cp12 certificate to anyone who leases a property with gas piping at least