Project Details

LEHR-Project: Low Energy Housing Retrofit

Project description

This project starts with an analysis of the actual building stock in order to identify those building segments which may have the largest multiplier effect for energy economy. Analogously a number of example projects were analyzed. An important aspect in this matter is the energetic performance and the owners motives to proceed to the renovation. Based on both these experiences and the most up-to-date research developments, new innovating concepts and components are developed. Insights resulting from international co-operation (participation in IEA SHC Task 37 and observation of the European project E-RETROFIT-KIT) will be translated towards national users, using a deliberate strategy to extend the market penetration of complex renovations.

Each partner will employ the following approach towards his/her particular target group (PHP: project teams, UCL: owners & architects, BBRI: construction industry):

  • Co-operation for the analysis of national housing statistics, the definition of potential renovation strategies and the determination of national priorities.
  • Identification of prototypical projects as test cases, which allow the testing of methodologies for the acceleration of market penetration.
  • Development of an alliance and a network to extend the market position and impact.
  • Documentation of the design and realization of example projects, as well as the environmental impact, resource usage, environmental planning, health and living comfort.
  • Selection of key parameters in the design
  • Identification on an international scale of trends, concepts and approaches which appeared to be effective and the documentation of these insights in the form of a brief design advice.

The UCL will produce project files and introduce the very low-energy renovation to the owners & architects in the form of a general publication. The BBRI will generate a technical manual to persuade the construction industry of the feasibility of very low-energy renovation. PHP will produce publications and project files which will inform planners and developers on the experiences of example projects. All partners will evaluate each others suggested information on a permanent basis.


The general directives will mainly confront laymen with questions on renovation and energy efficiency. These directives will be spread in the form of:

  • PDF document posted on the websites of partners and corresponding regions, and sent to target groups by email.
  • Hard copies for distribution on building fairs such as Batibouw, Passive House, etc.
  • Conference lectures

  • A technical guide will provide answers to technical questions from construction professionals and be spread in the form of:

    • Design documents during meetings with the follow-up committee
    • PDF files on partner websites
    • An official hard copy version aimed at the construction industry (‘Technical Guidelines BBRI’)
    • Conference lectures

    • The project information includes data from different example projects and will be spread in the form of:

      • Hard copy project files, distributed during construction site visits and meetings with new construction teams
      • Free PDF reference documents on the PHP website project database
      • IEA SCH annex 37
      • Poster information at construction fairs – conference lectures
      • Annexes to the general directives and the technical guide
      • The collection of general directives, a technical guide and project information will also be made available in one comprehensive publication which will be distributed during the final workshop for architects and construction professionals.


        The mission of the Belgian Federal Science Policy is to prepare, execute and evaluate science policy and its extensions. This research was carried out by order of the Belgian Science Policy, in implementation of the “Programme to stimulate knowledge transfer in areas of strategic importance”.