A gas safety check, resulting in a CP12 certificate, is a crucial inspection carried out on gas appliances and systems in properties, especially rental ones. This check is conducted by a qualified engineer who examines gas appliances, pipes, and flues to ensure they are safe and meet legal standards. The CP12, or Gas Safety Certificate, is then issued, confirming that the inspected appliances comply with safety regulations. This certificate is essential for landlords to prove their property’s gas systems are safe for tenants, and it must be renewed annually.