Course overview
First time in commercial gas?
Choose our Commercial Heating Gas Safety Upskill Package instead — includes full training.
Assessment Content
Practical & Written Assessment Covers:
• Commercial gas pipework installation requirements
• Chimney standards & Clean Air Act compliance
• Ventilation for commercial appliances (all locations)
• Combustion analysis: NOₓ & SOₓ testing
• Forced draught burner operation
• Appliance & pipework controls
• Strength testing, tightness testing & purging
Modules Assessed:
• CODNCO1 — Domestic → Commercial Changeover
• CIGA1 — Indirect Fired Commercial Appliances
• CDGA1 — Direct Fired Commercial Appliances
• CORT1 — Radiant Tube & Plaque Heaters
• TPCP1a — Tightness Test & Purge (≤1m³ / ≤6" dia.)
💡 Need only certain modules? Call us — we can tailor assessment & price.
What's Included
✅ Assessment fees ✅ Certification fee ✅ Full assessment support
Entry Requirements
You MUST:
• ✅ Hold CCN1 — Core Domestic Gas Safety
📞 Not sure? Call: 01525 657021 — we'll confirm the right assessment for you
COCN1
Core Commercial Gas Safety – Initial-assessment
This Gas Safety Assessment is designed to test the gas safety competence of an operative in core commercial gas work. Assessment will be done through a practical and written task to ascertain your knowledge and understanding. Operatives must hold a valid Domestic Gas Safety (CCN1) qualification or renew their commercial qualification
CoDNCO1
Changeover to Commercial Gas from Core Domestic Gas (CCN1)
Tests gas safety competence of those intending to extend domestic heating work range to include non-domestic heating
Initial-assessment
Tests gas safety competencies of an operative in pneumatic strength testing, tightness testing, and direct purging up to and exceeding 1m3 of non-domestic gas installations.
CDGA1
Initial-assessment
Tests the gas safety competence of an operative in the work of installation, commission, service, repair, and breakdown of direct gas-fired heating appliances and equipment
CIGA1
Initial-assessment
Test the gas safety competence of an operative in the work of installation, commission, service, repair, and breakdown of indirect gas-fired heating appliances and equipment
CORT1
Initial-assessment
Tests the gas safety competence of an operative in the work of installation, commission, service, repair, and breakdown of non-domestic overhead luminous radiant plaque and radiant tube heaters.