Commercial Core Gas Qualification (Non-Domestic)

CODNCO 1/COCN 1 – Changeover/Reassessment (Commercial natural gas training and assessment)

COCN1 – Core Commercial Natural Gas Safety is a pre-requisite assessment for all other assessments within the commercial sector which covers all aspects of gas safety and legislation.

Like domestic, there is also a core gas qualification required to work on commercial installations.

At Colchester Institute we offer a course which is called a “changeover/reassessment” course which upgrades a candidates existing domestic core qualification to cover commercial core

Alternatively, a qualification can be renewed for a candidate, who already holds the commercial qualification.

Commercial Appliances/Pipework

In order to work on specific appliances/equipment/pipework, there are various qualifications that can be added onto the core qualification. These are as follows:

  • CIGA1 – Commercial indirect fired heating appliances
  • CORT1 – Commercial overhead heaters
  • CDGA1 – Direct fired heaters
  • BMP1 – Boosters
  • ICPN1 – Installation of commercial pipework
  • TPCP1/1A – Testing and purging commercial pipework.


Training and Assessment

CODNCO1/COCN1 training is run over two days followed by a one day assessment.

Following on from the CODNCO1/COCN1, candidates can then attend a one day training course for their chosen appliances (CIGA1, CORT1, CDGA1, BMP1, ICPNI )

This is followed by the appliance assessment day for CIGA1, CORT1, CDGA1 and if required, an extra 1/2day for ICPN1

Occasionally, BMP1 is requested. This would require an extra 1/2 day assessment also.


  • This course requires one day training
  • This is followed by a one day assessment.
Course outcome/qualification

To extend (changeover) your core competences in order to work on commercial gas installations and retain (renew) or apply for Gas Safe registration within this scope of work.

Pre-requisite knowledge/qualification

Candidates must currently hold and provide evidence of existing domestic (CCN1) or commercial Core Natural Gas Safety qualification.

Example Schedule
DayWeek 1 Schedule
MondayRenewal /Initial Training
TuesdayRenewal / Initial Training
Wednesday Practical Assessment


DayWeek 2 Schedule
FridayAppliance Training
MondayAppliance Assessment
TuesdayAppliance Assessment (if BMP1 and ICPN1 as well)
ThursdayTCP1 Training
FridayTCP 1 Assessment



Changeover/Reassessment for Commercial Natural Gas
Course Outline: Candidates must currently hold and provide evidence of existing domestic or commercial Core Natural Gas Safety qualification.
DurationWe can adapt this course to suit your requirements
Campus / Adult Skills CentreColchester Campus
Start DateThis course runs a number of times throughout the year. Please contact us for the next available dates.
Fee(s)Training and Theory: £430
Practical Assessment: £305
Training Manual (if required): £42.50
Certification: £45

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All fees, prices and funding information shown on this page are for courses starting in the 2023-24 academic year unless stated otherwise, and are correct at the time of entering/printing information, however these may be subject to change due to factors outside of our control. The College cannot accept legal or financial liability as a result of any such changes.

Courses fees are generally not confirmed for September until June / July due to the above factors.

The course information describes programmes offered by Colchester Institute. The College takes all reasonable steps to provide courses as described, but cannot guarantee provision. The information is for guidance and does not form any part of a contract.

The College reserves the right to update and amend information as and when necessary. Colchester Institute will do its best to provide the courses shown, but may have to modify or withdraw a course depending on customer demand and other factors.