I had to read that several times to make sense of that last sentence. To save others, it means "Taking off the plaster counts as renovating for these purposes." not "Redoing to modern specs requires taking off the plaster".
Or there are other technical reasons why full insulation is not possible. Such a technical reason could be:
- You can't insulate externally because it is a boundary wall or you are in a conservation area. and
- You have a solid brick / stone wall that needs breathable insulation to prevent problems with interstitial condensation.
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