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Why Landlords Need a Gas Safety Certificate CP12 Any person who rents out a part or all of their property must get a CP12 Gas Safety certificate. This ensures all appliances are safe and comply with the laws. Landlords must also keep the records of all inspections. This is 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 an apartmen