Extensions can be tricky to assess. Guessing the year when an extension has been built can lead to errors in assuming insulation levels.
This particular property had what looked t one two extension, built at different times. Thermal imaging revealed very patchy cavity wall insulation and windows that were of a poor quality. Added to these factors was a floor level that was more than a foot above outside ground level on one side and only a few inches on the other. The floor was solid concrete and the radiators were inadequate.
This all added up to the main problem that the extension could not be heated to a comfortable level when the weather started to get cold.
We proposed externally insulating, changing the windows and increasing the loft insulation not 400mm.
This work meant that the room went for being ‘unheatable’, to being a very cosy and snug place in which to spend time.