The Construction21 network is based on a collaborative approach. Construction21 develops local and international partnerships with building professionals, industrials and innovators who find an interest in Construction21 platforms and international deployment.

Construction21 is also open to sponsorships for sustainable development actors looking for visibility.

Contact us to join the Construction21 partners or to become a VIP sponsor.


The Buildings Performance Institute Europe (BPIE) is a not-for-profit think tank with a focus on independent analysis and knowledge dissemination, supporting evidence-based policy making in the field of energy performance in buildings. A centre of expertise on all aspects of energy efficiency, renewable energy and energy performance of European buildings, the Institute focuses on policy analysis and advice and shares knowledge through studies, policy briefs, presentations and events. BPIE is promoting best practice approaches to improve the energy performance of buildings, thanks to publications and an open portal, the Data Hub. and
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Buildings represent about 40% of total energy needs in Europe. Improving their energy efficiency and energy use behaviours are thus a first and foremost priority towards reaching the EU’s energy and climate targets. This is a key aim of both Partners: Construction 21 as a collaborative platform dedicated to all professionals active in the sustainable building sector, and FEDARENE as a network of regional and local level public authorities and energy agencies for whom the energy efficiency of buildings in their territory is a priority.

Considering this common priority goal of improving the energy efficiency and energy use behaviour of buildings, the Partners have agreed to join efforts in promoting this goal notably by promoting each other’s work towards this goal.

R20 is a coalition of partners led by regional governments that work to promote and implement projects that are designed to produce local economic and environmental benefits in the form of reduced energy consumption and greenhouse gas emissions; strong local economies; improved public health; and new green jobs. These local actions can help the world achieve our shared global environmental and economic goals. Read more.

Construction21 and R20 joined forces to develop City21, international observatory for green cities and their sustainable urban solutions.

City21 will be a collaborative web platform hosted on Construction21. It will highlight exemplary urban initiatives, facilitate experience feedbacks to inspire communities and urban planners. Last but not least City21 will contribute to develop markets for green cities.

Green Planet Architects is the unique global platform bringing together architects specialising in sustainable development with other professionals in the building sector worldwide. The 750 sustainable architects in 80 countries present on our site benefit from a global visibility thanks to our Number One positioning on Google. Property developers, constructers, building contractors and other construction professionals can access the best green architects in the world using our site. We invite all sustainable architects to join us.

Thanks to our partnership with Construction21 you can receive the privileged conditions we are offering by entering the code C21 whilst registering on our site by clicking on the link: is the only green office building information portal in Europe, which helps the office seekers find their green office building according to office space, Green certification and office rental cost.

This can be in either a green office building which is planned, under construction or existing. The portal can be used to introduce the green building office market; the supply of office buildings and offices for rent which are green/ sustainable and the renting transactions and handover of the office buildings.