Supply Chain Advice Pack: Introduction to loft insulation
Introduction
With innovation in energy savings technology, basic measures like loft insulation can be overlooked, however up to 25% of heat loss in a home occurs through the roof. Therefore, it’s a critical part of the UK’s decarbonisation journey. Loft insulation was only introduced into the building regulations for new UK houses in 1974 and then only to a thickness of 25 mm2. Standards have improved a lot since then. A 2025 estimate is that of the 26.1 million homes in the UK with lofts, 67% have loft insulation (at least 125mm).
Many housing stock owners and installers may have already retrofitted most of their homes with loft insulation as it is usually seen as ‘low hanging fruit’ before moving onto more complex measures. It is traditionally a well-funded measure due to its heat loss saving potential. Through the Energy Company Obligation (ECO) scheme, which ran from 2013, to the end of December 2025 around 4.4 million measures have been installed in 2.6 million households, 18% of which were loft insulation.
This pack is designed at an introductory level and will follow a pre-install, install and post-install structure.
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Readers that would like this document in a more accessible format should contact rise@turntown.co.uk.
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