Layer 2: Sector economic activities

Goal: Determine if certain economic activities actually take place in your city or not and if so, what their economic size/significance is (measured in GDP or GVA), who (how many employees and which actors) are related to those and where are those stakeholders located.

Layer 2 is about gaining insights on the economic activities per material in order to develop their respective value/material chains. While in Layer 1 data on general economic activities were already collected, in Layer 2 you will focus only on the relevant activities per material and adds some additional (geospatial) information, which better describes the actors/companies behind these flows. Although Layer 2 and its sublayers are sector and material specific, the type of data to be collected are nevertheless the same and data for all the single life cycle/value chain stages of the 11 selected materials of the construction sector and 12 selected materials of the biomass sector need to be collected.


  1. Building on the flow diagrams, the NACE codes related to a material were exported to a worksheet. Open the worksheet template and make a copy for it for your city.

  2. Preliminary value chains have already been built for each material of the sectors and in Layer 2, you will confirm if those economic activities take place in the city. Try and complete the columns (GDP/GVA, employees, actors, and geo-localisation), for the rows (NACE codes). The usual providers of this kind of data are the Chamber of Commerce, economic agency of the city, and national (or regional) statistical offices. Please find specific information for each column in their respective SCA Handbook chapter:

This video introduces “Layer 2: Sector economic activities” and the main materials for the construction and biomass sectors.

Outline of the video

  • The course consists of module 3 and 4 that are dedicated to sector economic activities of construction and biomass sector
  • M1:26 The second layer of data collection is “Sector economic activities” and focuses on materials.
  • M1:32 The modules aim to analyse main life cycle stages of main materials, including extraction, manufacturing, use, waste collection, waste treatment, reuse, remanufacture, and imports/exports.
  • M2:10 The construction sector has 11 main materials, while the biomass sector has 12, representing a minimum amount required to assess circularity. The minimum amount of materials that can represent 80 percent of domestic material consumption.