Commercial catering gas certificate (CP42) and interlock
A Gas Safe registered engineer certifies your commercial catering gas appliances and, where you have mechanical extraction, tests the ventilation interlock that shuts off the gas if the extract fan fails — to IGEM/UP/19, commonly still referred to as "CP42".
A Gas Safe registered engineer certifies your commercial catering gas appliances and, where you have mechanical extraction, tests the ventilation interlock that shuts off the gas if the extract fan fails — to IGEM/UP/19, commonly still referred to as "CP42".
Commercial catering gas work is legally restricted to Gas Safe registered engineers qualified in the catering category, and the interlock stops carbon monoxide building up if your extract stops working — a genuine and recurring cause of fatal incidents in commercial kitchens.
Confirm they are qualified in the "catering" category specifically — not just domestic gas.
Who this is for
Any venue with gas catering appliances.
What you’ll hold
- CP42 / IGEM UP19 gas safety certificate
- Ventilation interlock test record
Watch out for
- Using a Gas Safe engineer registered only for domestic gas. Commercial catering work needs the separate "catering" qualification shown on their licence card.
- No interlock, or an interlock wired as an alarm only rather than one that actually cuts the gas supply — this does not meet the standard.
- Losing the certificate before your licensing or insurance renewal. Keep a copy off-site as well.
Sources
- Gas Safe Register checked 2026-09-02
- HSE — Gas safety checked 2026-09-02
See also
- Catering gas safety check (CP42)— this becomes an ongoing job once you’re open →
- Prove the extract meets the gas interlock and planning conditions
- Get a recorded fire risk assessment
This is item 37 of 66 in the free UK Launch Checklist. See the whole list →