The two main problems of the Intervamflats are comfort and energy consumption. The portiekflats from 1964 are not well insulated, which result in spaces that can not be heated sufficiently and a high-energy consumption. To make these portiekflats comply with current comfort standards and legislation (e.g. Energieakkoord: social housing must have label B on average in 2020) a renovation is needed, which is the binding factor between the state of the art and the architectural & cultural historical values.