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Gas Safety Certificates For Landlords and Homeowners A CP12 gas safety certificate shows that an engineer registered with the EPA has examined your property's gas appliances and pipework, and flues to verify that they are safe to use. Landlords are legally required to perform these checks annually, while homeowners can voluntarily obtain them to help maintain their homes in good order. Certificates of Landlords You will require several certificates if you are a private landlord.