Tenancy lighting assessment rules

The Tenancy Lighting Assessment (TLA) measures the power density of the general lighting system in office areas and describes the capacity of installed lighting control systems. The assessment covers both installed and proposed lighting, where applicable. It is based on a methodical survey of the general office lighting that can be reasonably expected to be left in place after the tenant leaves and the tenancy fitout is removed.

A tenancy lighting assessment is an important component of a Building Energy Efficiency Certificate (BEEC) required under the Commercial Building Disclosure (CBD) Program.

The assessment is carried out by a CBD Accredited Assessor using the CBD Tenancy Lighting Assessment for Offices Rules (the Rules).

The current version of the Rules is version 3.1, however an updated version 4.0 was released in August 2021 and was slated to come into effect on 15 November 2021.

Delays in the development of associated ICT systems have led to a new version of the TLA Rules (v4.1) being released that will now come into effect from 6 December 2021.

Please see the relevant documents below:

Which version of the TLA Rules do I use?




I am planning to complete the site assessment and submit a new TLA application before 6 December 2021.


Complete the site assessment using v3.1 TLA Rules and submit on the current assessor portal.


My client wants their new TLA to be assessed under v4.1 TLA Rules.


You can complete the site assessment using the v4.1 TLA Rules, but will be unable to submit this application until the new CBD assessor portal website launches on 6 December 2021.

If your client needs a new TLA and BEEC before this date, you can complete the site assessment using v3.1 TLA Rules and submit on the current assessor portal.


I am completing a new TLA and have already completed a site assessment using the v4.0 TLA Rules.


Two options available:

  1. Wait until 6 December 2021 and submit the TLA using the v4.1 TLA Rules in the updated CBD assessor portal website.
  2. Submit the TLA in the current CBD assessor portal (v3.1 TLA Rules). This will require approval from the CBD Administrator who will assist you to manage the data input differences between the v3.1 and v4.1 TLA Rules.

Can I convert my v3.1 TLA Rules application to a v4.1 TLA Rules application post 6 December 2021?


If you have a TLA certified under the v3.1 TLA Rules, you can resubmit a BEEC application using this TLA after 6 December 2021 and the BEEC will display the updated Nominal Lighting Power Density (NLPD) bands as per v4.1 TLA Rules.


What happens if I modify a TLA completed with the v3.1 TLA Rules after the new system goes live on 6 December 2021?


If a TLA under v3.1 TLA rules is modified in the updated assessor portal website post 6 December 2021, it will be automatically converted to the v4.1 TLA Rules, and will display the updated NLPD bands. Some minor additional data may need to be entered by the CBD Assessor to facilitate this conversion.

If you have any questions, please contact the CBD Administrator on 1800 020 131 or email info@cbd.gov.au.

Modifying a tenancy lighting assessment

A tenancy lighting assessment is certified for 5 years. During this period, a building owner may engage an Accredited Assessor to modify a certified assessment to show any lighting upgrades that occur. A modified tenancy lighting assessment retains its original expiry date. When a tenancy lighting assessment is modified, the building owner can choose to modify as many or as few spaces as they wish.

If an Accredited Assessor is asked to modify an assessment that they submitted originally, the assessment will be readily available to modify through the assessor portal. 

However, if a different Accredited Assessor completed the original assessment, any subsequent Accredited Assessors will need to contact the CBD operations team to confirm that they have the building owner's permission to modify the assessment.  The CBD operations team will then release the assessment for modification through the assessor portal.