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TM65LA Embodied carbon in building services: Using TM65 outside the UK
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TM65LA Embodied carbon in building services: Using TM65 outside the UK

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Embodied carbon in building services: Using the TM65 methodology outside the UK (TM65LA) aims to complement CIBSE TM65 Embodied carbon in building services: A calculation methodology, and to create global consistency on how the embodied carbon of building services equipment can be assessed. As such, it sets out how the embodied carbon methodology can be adapted to be used outside of the UK. It is not a standalone document, and cannot be applied without first understanding TM65.

To ensure that the CIBSE embodied carbon methodology is globally valid and globally consistent, CIBSE supports the creation of local addenda to TM65 that are specific to localities outside of the UK. This document aims to assist in the creation of these local addenda. Assumptions should be relevant to the locality in question, and consistent with the CIBSE TM65 methodology.

Those interested in creating a local addendum to the TM65 methodology should first read the FAQ section and process description at www.cibse.org/tm65. It may also be helpful to review the first international addendum, Embodied carbon in building services: A calculation methodology for Australia and New Zealand (TM65ANZ). 

The CIBSE embodied carbon methodology now includes several publications, digital tools, and free-to-all data-gathering forms. All of these can be accessed from www.cibse.org/tm65.

To find out more about both TM65ANZ (Embodied carbon in building services: A calculation methodology for Australia and Newx Zealand) and TM65LA (Embodied carbon in building services: Using the TM65 methodology outside the UK), access the the CIBSE #GrowYourKnowledge webinar here. There are a few other #GrowYourKnowledge webinars about the TM65 methodology as well - all can be found at www.cibse.org/growyourknowledge.

1  Introduction     

1.1 Context    

1.2 Purpose of the TM65 methodology

1.3 Why the CIBSE TM65 methodology should be adapted to a local context

1.4 Aims of this document

1.5 Structure of this document

2  Creating a local addendum to CIBSE TM65: The process

Step 1: Go/No go

Step 2: Contact CIBSE

Step 3: Set up a working group in the defined locality

Step 4: Clarify how the TM65 methodology should be adapted

Step 5: Agree material embodied carbon coefficients

Step 6: Agree assumptions specific to the locality

Step 7: Conduct a sensitivity analysis

Step 8: Draft the addendum

Step 9: Engage with stakeholders and marketing teams

3 What to do when no local TM65 addendum exists

3.1 Key steps

3.2 Forms and reporting

Appendix A: Summary of Embodied carbon in building services: A calculation methodology (TM65)

Appendix B: Summary of Embodied carbon in building services: A calculation methodology for Australia and New Zealand (TM65ANZ)

Appendix C: Varying assumptions for different localities

Appendix D: The CIBSE building services taxonomy

Appendix E: Key carbon definitions


The CIBSE embodied carbon methodology now includes several publications, digital tools, and free-to-all data-gathering forms. All of these can be accessed from www.cibse.org/tm65.

Authors: Louise Hamot and Clara Bagenal-George (Integral Group)

Contributors: Dr Joe Jack Williams (Feilden Clegg Bradley Studios), Dr Julie Godefroy (CIBSE), Leonardo Poli (Elementa Consulting Ltd), Louise Wilkinson (Elementa Consulting Ltd.), Simon Wyatt (Cundall)

Peer reviewers: Luke Leung (SOM), Kim Shinn (TLC), Matt Jungclaus (University of Colorado Boulder), Margaret Logan (Armstrong Fluid Technology), Meghan Lewis (Carbon Leadership Forum), Mirko Farnetani (SOM), Nicole Sullivan (Thinkstep ANZ), Philip Johnson (Daikin Applied), Steph Carlisle (Carbon Leadership Forum)