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How Long Does a Gas Safety Certificate Last? A gas safety certificate confirms that all gas appliances and fittings in a home have been checked for safety. This is a requirement for landlords each year. The gas engineer who checks your property will issue a CP12 (older names for this include Corgi Proforma 12). To ensure you receive the best service, it's important to choose a registered engineer. It is valid for a year A gas safety certification is a document that prove