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What is a Gas Safety Certificate and Who Needs One? A gas safety certificate is a document that includes all the tests and inspections an engineer conducts on your gas appliances. These inspections reduce the risk of poisoning with carbon monoxide at home. Landlords are required by law to conduct these inspections on an annual basis. Gas Safe registered engineers must also conduct the inspections. What is an Gas Safety Certificate (GSC)? A gas safety certificate is an official document which proves that the installations and appliances of your property ha