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About the exam

Delegates will not be excluded if they haven’t undergone training with CIBSE, although are expected to have either taken training with another provider or have a sufficient knowledge in order to sit the exam.  

​Purchase the exam only option. 

About the Low Carbon Consultant Building Operations Examination

The exam is 'Open Book' - texts allowed are:

  • Approved Documents L2A and L2B: CLG guide
  • The course handouts (for those who have attended the CIBSE training)

There are 50 multiple choice questions (worth two marks each). The exam is marked out of 100 and the pass mark is 70%. The time allowed is 90 minutes.
Based on government guidelines, an additional 25% extra time is given for special needs. Time allowed is 113 minutes.

Once your attendance on the course has been confirmed you will have access to the exam via your CIBSE Online Learning Portal under the tab ‘My Learning’. This will be available to access for 14 days from the last day of your course.

If there is any reason that you should not be able to complete the exam online, please contact a member of the training team at to make alternative arrangements.

The exam is in two parts, a written exam with 50 multiple choice questions (worth one mark each) and a simulation exam where two DEC certificates are to be produced.  Both elements must be passed. Delegates are asked to ensure they have the appropriate software and security privileges installed on the laptop they bring with them to the exam. Should delegates not have appropriate facilities, with sufficient notice CIBSE Training will provide this for them. Trainers are advised to check all delegates’ equipment prior to the software assessment. This is noted in the invigilator procedure.

Multiple choice questions only have one right answer – candidates should note that some questions offer options for ‘all of the above’ or ‘none of the above’ so the questions should be read carefully. The questions will cover the whole syllabus, some of which is only covered in the pre-reading. Some of the questions will require good engineering judgement. Some of the questions will require a calculation. You will need a calculator.

The exam is hosted via the CIBSE Learning Management System. Each exam is timed and will automatically log the candidate out once the time has ended. The CIBSE Learning Management System has a single sign on system forcing the candidate to login with a username and password. Once the exam has been started the candidate is unable to pause or restart the exam and must be finished in the allocated time.

Although the exam is 'open book' it is not designed to allow candidates to look up all the answers - material allowed should be regarded as reference. If candidates have not prepared thoroughly by completing the pre-reading and understanding the training course, they may find it hard to finish the exam. CIBSE Training must be notified in advance of any relevant special needs or requirements.

Notification of examination results

All candidates are notified of the result of the examination by email. Such notification will normally be sent within two weeks of the examination unless the result is the subject of a complaint.


Candidates are offered the opportunity of one re-sit at no charge if they fail the exam. The re-sits are arranged with a member of the Training Team. If the re-sit is not successful we recommend the candidate takes further training before trying again. If they would like to re-sit a further time, then there is a charge associated with this. There is no limit to the number of times a candidate can re-sit. 


If a delegate feels that fairness process has not been correctly applied, they may make use of the appeals procedure. CIBSE Training will ensure that the person decision-making in the appeals process should be different from those involved in the original discrepancy.

  • Appeals should be made in writing at least two weeks from the date the results are received
  • Appeals must be made in writing to CIBSE Training via email. Instructions to do so are on the website under ‘about the exam’.  The paper will be reassessed by a suitably qualified member of CIBSE who has not been involved in the original marking process.
  • The appellant will be informed in writing of the outcome of the appeal.

Make an enquiry to CIBSE if:

  • If a delegate feels there may be a mistake in the exam questions.

Examination/ Security concerns may be submitted in writing to:

By Mail:

Training & Events
222 Balham High Road
London, SW12 9BS

By E-mail:

If you want to submit a concern anonymously, you may do so; however, please be sure to include as much information as you can about your situation because we will not be able to contact you for additional details. For example, if describing an incident at a test center, please state the location and time of the event and as many specific details about the event as possible. 

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