Who said you would get permission to renovate? It's historic and made from stone. You can't add windows or insulation, it needs constant ventilation to prevent

Who said you would get permission to renovate? It's historic and made from stone. You can't add windows or insulation, it needs constant ventilation to prevent mould (no water barrier in the construction). Basically it's only pleasant in the summer or if you're being raided by a neighbouring state.