Gas Diploma

The Gas Diploma has been approved by the Gas Industry Standard Setting Body, Energy and Utility Skills. Individuals holding the Gas Diploma are recognised as being eligible to undertake relevant domestic gas assessments for the Nationally Accredited Certification Scheme for Individual Gas Fitting Operatives (ACS). All succesful individuals will be issued with a certificate.


There are no pre-requisites for applicants wishing to undertake the Gas Diploma; Applicants will be required to gain and provide evidence of a range of relevant gas work experience under the supervision of a Gas Safe registered installer.

Off–the-job training

Assessment centres deliver a training programme focussing on the contents of a number of key ‘normative’ documents, e.g.: Gas Safety (Installation and Use) Regulations, Gas Industry Unsafe Situations Procedure, British Standards, Codes of Practice, Etc.

On–the-job work experience

The candidate will be required to gain real world, gas work experience under the supervision of a qualified Gas Safe registered engineer. This must include (but shall not be limited to) the following elements:

Testing for tightness, Purging, Pipework installation, Checking ventilation, Testing safety controls, Inspection of flue systems, Testing of flue systems, Re-establishing gas supplies and re-lighting appliances, Identification of appliance or pipework faults/defects, Working on appliances relevant to the work categories undertaken.

The candidate will be required to produce a ‘portfolio of evidence’ which details the real world, gas work experience. All evidence provided shall be witnessed and verified by the qualified Gas Safe registered engineer.

The portfolio and the diploma can be completed from start date to finish date within 26 weeks.