The information gathered from the analysis is actually used by VDAB in the investment projects. Various projects have already been planned for implementation this year. What we particularly appreciated was the constructive attitude and cooperation of Freestone in the elaboration to include even more relevant criteria in the evaluation table, in order to obtain a broader than energetic sheet per building. Ignace Naeyaert - Diensthoofd Facility VDAB

For the latter, the buildings that will be retained for the time being, it must be determined whether it is worthwhile effectively retaining them subject to energetic renovation for the estimated useful life of these buildings. The aim is to stretch the life span of these buildings provided that this is in balance with the cost of the energy renovation.

In addition, the 'avoidance cost' is also taken into account for the buildings which would be included in the master campuses.

Freestone, in cooperation with Ingenium, examines the feasibility of CO2 neutrality on both building and heritage level. After an individual analysis of the individual sites, different scenarios are worked out on the patrimony level.

This analysis will support VDAB in their real estate strategy and policy decisions.

Plan of approach

VDAB Plan van aanpak

Phase 0 Strategic frame

Focus = CO2 neutral + investment wothiness

The following adjustments, preconditions are added:

VDAB Fase 0

Fase 1

A. Study based on NEN 2767

Condition assessment and screening of the buildings based on the following aspects:


Establish relevant assessment framework for the patrimony of VDAB that determines the investment worthiness of a building on the basis of objective information including condition measurement

B. Study of energy conservation works

The calculations are carried out for each building in the following steps:

  • Architecturally, we look at what improvements can be made to the external envelope to reduce heat losses: roofs, facades and external joinery.
  • Technically, the resources that have already proved their worth on the market are applied: heat pumps and PV panels.
  • For the consumptions (gas and electricity), the averages of the years 2017, 2018 and 2019 are taken.
  • The gas consumption is converted to calorific consumption with the correction of the building measures.
  • The heat pump is selected with the above mentioned capacity.
  • The yield of the solar panels is calculated according to the location and over the average of one year. We take the percentage yield as a function of the orientation for annual irradiation in Uccle.
  • The number of panels is determined by the remaining available roof area and limited to 80% of the total available roof area.

C. Stay, stretch or leave analysis

Based on the decision framework and the investments, both in terms of size and timing, it is determined what should happen to the building

On the basis of the decision framework and the investments, both in terms of size and timing, it is decided what should happen to the building