We are interested in buying a Grade 2 listed building which has single glazed windows. It is a large house (former rectory) and I would be keen improve the insulation . My understanding is that the order of priority should be : 1 roof insulation, 2 cavity wall insulation, 3 window insulation.
Re 3, replacing the windows with double glazed units which would get LBC would be prohibitively expensive so I am interested in secondary glazing solutions. Ideally it would be reversible so that LBC would not be required.
Does anyone have any suggestions for good secondary glazing systems, or indeed any other relevant pearls of wisdom 😉 ?