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Why Landlords Should Have a Gas Safety Check Landlords are required to have their gas appliances and flues checked every year and receive the CP12 certification. Homeowners should also have their property inspected to receive this important document. A CP12 certificate is a legal document and only an engineer who is registered with the Gas Safe Register can issue it. The inspection consists of checking the safety of all appliances as well as giving a report to owner. Gas Saf