Supply and Demand


The Circular City calls for new solutions in bringing together supply and demand for raw materials in construction and the built environment, at both urban and regional level. One key question is how the difference between supply and demand for raw materials can be bridged in terms of quality, location and time.

To help in bridging the difference between supply and demand, two digital tools have been developed. Both can assist municipal authorities and other parties in tackling this problem, each in their own way.

The Circle Region Toolbox

The Region Toolbox (RHDHV/Circle lab) assists government authorities and businesses in ‘discovering’ networks, flows and methods, ‘developing’ on the basis of best practices and business models, and ‘doing business’ based on an understanding of each individual player’s role and the (innovative) resources that can be useful. Because this tool introduces (supply and demand) parties to one another, and identifies the various flows, it helps bring together supply and demand.

The Region Toolbox is a tool for focusing attention on the circular economy within a municipality or region, and grasping opportunities. Within that focus, the various stakeholders are introduced to one another, and cooperation is encouraged. This helps facilitate the matching of supply and demand. It can also help to develop regional circular economy strategies. The objective is to encourage a rapid spread within specific circular activities, to offer a clearer view of opportunities and the exchange of knowledge and best practices at the various local and regional levels. The use of the toolbox can encourage further cooperation.

The Region Toolbox has been used in various contexts in cities involved in the City Deal. Work is currently on the way on further developing management and maintenance (content) of the toolbox, and the possibility of distribution via this website.

Bouw-op-de-Kaart (Building on the Map)

This tool is still currently being developed.

In the medium to long term, this tool will offer policy makers and other parties at city, regional and national level an insight into the market for supply and demand of building materials and demolition waste. The tool also identifies promising operational prospects for (technological) innovations and policy in respect of circular building.

Bouw-op-de-Kaart offers a digital insight into the supply and demand market for building materials on the basis of forecasts for construction, demolition, renovation and repair of housing, office and industrial buildings and infrastructure projects. Using this information, it is possible to estimate which material/product will be available where and when, and where and when demand is expected to arise for circular materials/products. This makes it possible to calculate in what form, at what scale and with what logistic support reuse becomes worthwhile. Whether or not reuse is ‘worthwhile’ will be determined on the basis of a series of indicators such as environmental burden, transport movements and costs of reuse.

The tool is not yet ready to use. The consortium (collaboration between TNO, the organisation for applied scientific research, universities (of higher professional education) and practical partners) is currently working on the digitalisation, decision-support indicators and business models for answering such questions as:

  • What is the current state of affairs in the regions with regard to building stock, the availability of materials, use of space and transport flows?
  • What is the effect of building demand on material volumes, use of space and transport flows?
  • What is the effect of a circular approach to construction assignments on material volumes, use of space and transport flows? This can be presented on the basis of two scenarios.
  • Are there problem at the bottlenecks and do they provide grounds for follow-up steps?
  • Bouw-op-de-Kaart will be created by combining EIB forecasts with the BOB model from TNO. The BOB model from TNO stands for BOuwmaterialen in Beeld (Building Materials Mapped out). It is a unique database in the Netherlands in that it combines partially public databases including the BAG and BRBS member list, with building profiles, environmental databases and logistic components developed by TNO. The entire built environment in NL plus certain parts of the infrastructure are included in the database. The material volumes are based on estimates.

More information via de downloadable Bouw-op-de-Kaart