Insulation of the building envelope – Other dwelling types

Authors: Niessink, R.J.M.
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Thermal insulation is a way to reduce the heat demand of a dwelling. Consequently this reduces the energy use related to space heating and improves thermal comfort. A good insulation level is also a requirement for a low temperature heating system. There are different insulation measures, different insulating materials and different layer thicknesses corresponding to different heat resistances/Rc-values in m2⋅K/W. This factsheet looks from an integrated modeling perspective to insulation. Based on a number of inputs, the factsheet presents costs, effect on heating demand (space heating only) and avoided CO2 emissions, associated with thermal insulation measures resulting in a specific label improvement. The figures in this factsheet are meant to model insulation on an aggregated level (the building stock).

Values on costs and savings are obtained from the TNO Variatietool (TNO, 2021). This tool comprises a dataset from the WoOn energy module that consists of socio-economic and energetic characteristics of a representative sample of approx. 4.500 dwellings in the Netherlands. The data contains different energy measures (insulation and/or installation measures, combined in packages) and associated costs and savings for these measures, resulting in different label improvements of these dwellings. The changes in energy use and energy labels are calculated by DGMR (more info in ‘Effect on Heat Demand’). For this factsheet, it was opted to relate the heat demand and costs to the change in energy label (looking at Rc-values of the specific measures is also possible, but requires a more detailed approach). Only label improvements that are realised by improving the thermal insulation are taken into account (label improvements can also be realised by improving the heating installation or solar PV but these are out of scope). Moreover, an average investment and average heat demand reduction for dwellings that go from one specifc label (or label group) to a better label (or label group) is calculated. Types of thermal insulation measures that may be included in a label improvement are roof, wall, floor and improvement of glazing. In most cases only a selection of these measures is needed to achieve a specific label improvement.

Figure 1. BENG reference corner house
Figure 2. BENG reference detached house


Note that for each part of the dwelling envelope a variety of measures is possible in the packages in the Variatietool, for instance:

  • Wall insulation can relate to either cavity wall, panel or inner/outer wall insulation (whichever applicable).
  • Roof insulation can relate to either a sloping roof or a flat roof (whichever applicable).
  • Energy efficient glazing replaces either single or double glazing (whichever applicable).

Scope of this factsheet:

  • This factsheet considers only a part of the residential sector (see field ‘Subsector’). ‘Other dwelling type’ in this case refers to all non-terraced houses and non-apartments. This category consists of detached houses, semi-detached, and corner houses. (Detached house:
  • A change in space cooling demand due to insulation measures is not taken into account.
  • Although collective application of insulation by housing cooperatives (e.g. multiple dwellings in a single project) may reduce overall investment costs due to ‘scaling up’, this factsheet considers costs related to individual application. This also means further cost reductions are possible. More assumptions on costs can be found in the costs section.