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Why Landlords Need a Gas Safety Certificate CP12 Any person who rents out a piece of their property must obtain a CP12 gas safety certificate. This guarantees that all appliances are safe and complies with the law. Landlords also need to keep records of any inspections. This is important if the landlord decides to sell their property. Legal Requirements Gas Safe registered engineers must inspect and issue the gas safety cp12 certification to anyone renting out the property