Integrated assesment of Energy and environmental building performancelogo TKI-KIEM

Within the national research project TKI-KIEM, W/E consultants, TU Delft and several other partners from the building chain have  jointly developed a method to evaluate energy and environmental performance of buildings in an integral way. The method builds upon two existing assessments which are implemented and mandatory within the National Building Code.

The first assessment method is energy performance of the building which is in line with European EPBD directive and which considers only the operational energy consumption of the building. The second assessment method considers the environmental impacts of the materials used in building construction and maintenance, and is based on the method of Life Cycle Assessment. The use of two separate indicators for building performance gave rise to conflicting messages to  designers, especially in the context of near zero energy buildings additional PV panels or other energy saving equipment.

Therefore a methodological approach was developed to aggregate the results from both asessments into a combined impact indicator which considers both energy consumption and building material requirements from a life cycle perspective.

The assessment method was tested and applied in practice in the context of renovation and maintenance projects with sustainability targets. Also the method was implemented within GPR Building, a software tool for Sustainable Building Assessment which used widely by designers, contractors and local authorities in the Netherlands.

W/E consultants was the initiator and coordinator of the project, which ran from January 2014 until March 2016 and which was co-financed by the Dutch Ministry of Economic Affairs by way of the innovation support programme TKI-EnerGo.

The TKI-KIEM consortium – a wide range of organisations

  • Research Partners: Technical University Delft faculty of Architecture, W/E consultants, Dutch Foundation for Construction Quality (Stichting Bouwkwaliteit), IMd Engineering Advisors
  • Building Materials Industry: St Gobain / Raab Karcher, Rockwool, CRH Europe-Sustainable Concrete Centre
  • Industry associations: Dutch trade organisation of steel industry in construction (Bouwen met Staal), Dutch Precast Concrete Manufacturers Association (Bond van Fabrikanten van Betonproducten), Dutch Association for Construction Supply industry (Nederlandse Vereniging Toelevering Bouw), Dutch Association of Maintenance companies (OnderhoudNL), Institute of Dutch Architects (Bond van Nederlandse Architecten), Dutch association for social housing associations (Aedes)
  • Social housing associations: Portaal, de Alliantie, Ymere, GroenWest, Rochdale, Woonbron, Provides, WonenBrebrug
  • Contractors and maintenance companies: Heijmans, Rutges Vernieuwt, Talen, Hagemans, Smits, Hurks, Willems, Burgers van der Wal, Vastbouw, Van Wijk, Weijman

The assessment methodology and case studies were presented in a scientific paper at the Sustainable Built Environment Conference SBE 16 in Tallin, 2016. This paper was awarded with a “best paper award” from the conference scientific committee.

Paper SBE16 Conference: Integration of Energy and Material Performance of Buildings: I=E+M
830.6 KiB

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The same presentation was also selected as invited paper for the World Sustainable Built Environment Conference, which was held  in June 2017 in Hong Kong.

For more information, please visit (Dutch website) or contact Erik Alsema:, +31 30 – 677 8761.

diagram levenscyclus van gebouwen WE adviseurs TKI KIEM
foto sessie TKI KIEM