Smith and Wallwork has published its 4th annual carbon report, providing data on the structural materials installed on its construction sites in 2023. It has taken us a while to crunch the numbers and it is encouraging to see less materials going to site and carbon numbers coming down. However, it does not mean we have suddenly become world-leading experts on lean design – one reason for the reduction is that we have fewer projects on site and more on the drawing board. Encouragingly, the other reason for the reduction is that more projects have been re-use projects which are more material and carbon efficient.