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What is a Gas Safety Certificate? Gas safety certificates are issued by trained engineers to ensure that the pipes and appliances of your home are safe to use. This check should be performed annually by landlords and the building owner. Only an engineer registered with Gas Safe can carry out a gas safety inspection and issue an official certificate. You can verify their license number on the internet. The Gas Safe Register The Gas Safe Register is the official UK organisation which recognizes all qualified engineers who are allowed to work on gas ap