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How Much Gas Safety Certificate Does a Landlord Need? Gas safety certificates are a must for landlords. It guarantees the safety of all appliances as well as pipework in their property for tenants. This also helps to avoid any legal issues. The checks are required annually by a Gas Safety registered engineer. They usually cost between PS60 to PS90. The cost is contingent on the type and quantity of appliances The cost of a certificate of gas safety can vary greatly