https://learn.openenergymonitor.org/sustainable-energy/building-energy-model/fabricheatloss

https://trystanlea.org.uk/ https://github.com/TrystanLea/heatlossjs https://www.heatgeek.com/heat-losses/

https://www.designingbuildings.co.uk/wiki/K-value_thermal_conductivity

http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=15028

https://web.archive.org/web/20190503215407/http://www.kayelaby.npl.co.uk/general_physics/2_3/2_3_7.html

https://www.ibstockbrick.co.uk/wp-content/uploads/2021/06/TIS-A9-UNDERSTANDING-K-VALUES-AND-U-VALUES-2021.pdf

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/771765/WP2_Nature_of_solid_walls_in-situ_v3.2b.pdf

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/571939/SAP_consultation_document__with_links_.pdf

Table S6 – Wall u values England https://www.bre.co.uk/filelibrary/SAP/2016/CONSP-16---Wall-U-values-for-existing-dwellings---V1_0.pdf

https://www.bre.co.uk/filelibrary/rpts/uvalue/BR_443_(2006_Edition).pdf https://www.bregroup.com/wp-content/uploads/2019/10/BR443-October-2019_consult.pdf

https://www.bre.co.uk/filelibrary/SAP/2016/RdSAP-2012-9.93--July-2016--CONSULTATION-VERSION-01-07-2016.pdf

https://www.gov.scot/publications/supplementary-topic-notes-review-domestic-non-domestic-energy-performance-certificates-scotland/pages/2/

https://ilearn.fife.ac.uk/pluginfile.php/105852/mod_resource/content/1/CIBSE%20Guide%20A_%20Environmental%20Design%5B1%5D.pdf p100

http://ierga.com/hr/wp-content/uploads/sites/2/2017/10/CIBSE-Guide-A-Environmental-design.pdf p135

https://www.archdaily.com/898843/how-to-calculate-the-thermal-transmittance-u-value-in-the-envelope-of-a-building