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Gas Safety Certificates For Landlords Gas safety certificates are required by law for landlords. They must be issued prior to when new tenants are allowed to move in and have to be renewed every year. Inability to do this could result in hefty fines. A CP12 is proof that a gas engineer who is qualified has examined the gas appliances and flues of a building. It also confirms that the appliances comply with British safety standards. Commercial Gas Safety Inspection Certificate