Module A0, which covers non-physical pre-construction activities, is generally assumed to be zero for buildings. However, for infrastructure projects A0 can include ground investigations and activities associated with designing the asset.
Modules A1–A3 (product stage) cover the extraction, transporting and manufacturing processes necessary to produce the construction products, components and technical equipment required to construct the asset.
Modules A4–A5 (construction stage) cover transporting construction products and any construction processes, up to project completion. Module A5 also includes any on-site demolition or strip-out works required at the beginning of the project.