# calculation tools **URL:** \ **Category:** BREEAM\ **Tags:** building-lca\ **Created:** [February 24, 2024, 1:40pm UTC](https://community.oneclicklca.com/t/calculation-tools/732 "2024-02-24T13:40:24Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![mina.amani](https://avatars.discourse-cdn.com/v4/letter/m/258eb7/32.png) [@mina.amani](https://community.oneclicklca.com/u/mina.amani)\ **Post date:** [February 24, 2024, 1:40pm UTC](https://community.oneclicklca.com/t/calculation-tools/732/1 "2024-02-24T13:40:24Z")
I am reaching out to seek clarification on the compatibility of the calculation tools of our One Click LCA licence with the requirements specified by our clients. Our client’s need is: Use a building LCA tool that is recognised by BREEAM (as suitable for assessing core building services during Concept Design) according to the methodology. The tools we are currently using are as follows: 1. **Whole Life Carbon Assessment (GLA / RICS / Green Mark):** 2. **Whole Life Carbon Assessment (GLA / RICS / Green Mark including EN15804 +A2 data):** 3. **Building Circularity (Greater London Authority):** I would appreciate it if you could verify whether these tools satisfy by BREEAM for assessing core building services during the Concept Design phase. ---
**Author:** ![Bernadette](https://dub1.discourse-cdn.com/flex013/user_avatar/community.oneclicklca.com/bernadette/32/62_2.png) [@Bernadette](https://community.oneclicklca.com/u/Bernadette)\ **Post date:** [February 27, 2024, 12:50pm UTC](https://community.oneclicklca.com/t/calculation-tools/732/2 "2024-02-27T12:50:52Z")
Hi Mina, welcome to the community and thank you for your post! There are some crucial **differences between GLA/RICS and BREEAM UK** : - With GLA/RICS, only carbon emissions are reported, whilst BREEAM UK also assesses _other impact categories_ such as acidification, eutrophication etc. - The _databases of the tools differ_, so you might use data that is not allowed for BREEAM UK. The difference is because 1) only A1 data is available in BREEAM UK tool whereas in GLA/RICS there are A1 & A2 data points and 2) only data which includes all environmental impact categories is available in BREEAM UK, whilst in GLA/RICS one can also find data points which only present the GWP results but don’t include other environmental impact categories necessary for BREEAM UK. - The checkbox for _indicating if a resource is an EPD_ is not available in the GLA/RICS tools, which helps achieve the Mat02 credit. - The results are per RICS-category and life-cycle stage, whilst in the BREEAM Tool, you see impacts per life-cycle stage as well as the values for _Mat02, Mat03 and Mat06 credits._ - GLA/RICS mandates to use the _RICS default service life_ and using another method else results in a warning sign. Concerning the **[Building Circularity (Greater London Authority)](https://oneclicklca.zendesk.com/hc/en-us/articles/360022059839-Building-Circularity-Greater-London-Authority)** tool: This is designed for assessing the circularity of a building (recovered/returned materials vs. virgin and disposed materials) and its cost. The result is a building circularity score, which doesn’t report on GWP, acidification, eutrophication etc. Thus, I’d advise using our designated BREEAM UK tool. The BRE, the institute behind BREEAM UK, has confirmed our software is 100% [compliant](https://www.oneclicklca.com/wp-content/uploads/2016/11/BREEAM_International_2016_Mat01_Verification_OneClickLCA.pdf) (allowing to achieve all credits) and awarded it to be the highest performing for four times in a row. Here you can [book a demo](https://www.oneclicklca.com/certifications/breeam/uk/) where one of our experts introduces you to the tool. ---
**Author:** ![danielle.dinneen](https://avatars.discourse-cdn.com/v4/letter/d/5f8ce5/32.png) [@danielle.dinneen](https://community.oneclicklca.com/u/danielle.dinneen)\ **Post date:** [March 8, 2024, 5:03pm UTC](https://community.oneclicklca.com/t/calculation-tools/732/3 "2024-03-08T17:03:04Z")
Hi Bernadette, Could you please confirm that the BREEAAM UK tool is also the correct tool for undertaking LCA for BREEAM UK RFO? Many thanks. ---
**Author:** ![Bernadette](https://dub1.discourse-cdn.com/flex013/user_avatar/community.oneclicklca.com/bernadette/32/62_2.png) [@Bernadette](https://community.oneclicklca.com/u/Bernadette)\ **Post date:** [March 11, 2024, 10:03am UTC](https://community.oneclicklca.com/t/calculation-tools/732/4 "2024-03-11T10:03:12Z")
Hi Danielle, thank you for your post! Yes, correct, you will need to use the UK tool for UK-based credits (UK NC and UK RFO). As mentioned, the BRE approved our UK tool for UK BREEAM schemes. Please let us know if any more questions come up.