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What Does a Gas Safety Engineer Do? Gas safety certificates (also known as CP12s) are legal documents that verify that your gas appliances and chimneys are in compliance with the standards required. These certificates are essential for homeowners and landlords who lease their properties out. Only engineers who are registered with the Gas Safe Register can legally complete a gas safety check. Before you hire an engineer, ask to see their Gas Safe ID card. Qualifications A gas safety engineer has t