The 2021 baseline measurement for Wesselink Isolatie states, as context, that nearly 8 million Dutch homes with energy label C or lower still needed insulation. This figure describes the scale of the insulation task at that time and should not be read as a current count for 2026.
The scale of the task also makes material choice relevant. Alongside energy savings during use, production, installation and any carbon storage in insulation materials must be considered to determine the net climate benefit. Source: Wesselink insulation climate impact, New Economy.