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A CP17, the Non-Domestic Gas Installation Safety Report, is the commercial equivalent of a domestic CP12. Non-domestic premises with gas appliances need an annual inspection by a Gas Safe registered engineer holding commercial competencies. It assesses the appliances, pipework, flues and ventilation, is valid for 12 months, and records the installation as satisfactory or defective.
Reviewed by Jordan Valentine-Dunn, Gas Safe registered engineer · Portsmouth Gas Heating · Last reviewed July 2026
A CP17 is the Non-Domestic Gas Installation Safety Report, the commercial equivalent of the domestic CP12. Commercial and other non-domestic premises with gas appliances, from shops and offices to restaurants, must have an annual gas safety inspection, just as a rented home does.
The key difference from a domestic check is competence. A CP17 must be carried out by a Gas Safe registered engineer who holds the relevant commercial, or non-domestic, competencies, not just domestic ones. Domestic qualifications alone are not enough for commercial work.
Only a Gas Safe registered engineer who holds the relevant commercial competencies can carry out the inspection and issue a valid CP17. This is general information, not legal or safety advice for a specific premises.
Last reviewed July 2026. This guide is general information, not legal or safety advice, gas safety work must be carried out by an appropriately Gas Safe registered engineer. Rules can change, so check the linked official sources for the current position.