Hello Budding Builders. I have recently bought a 1967 bungalow with 20* pitched roof in a rural location close to my home in Cornwall. It was inhabited by the builder and his family until he died last year with no alterations. Mainly brick facing, airgap, studs, timber cladding, airgap, plasterboard. Floor Concrete battens Chipboard. The loft, internal walls and external soffits display a myriad of cables, wiring, phone, Tv, security systems. I hope to raise the bungalow to close to Passivhaus standard. There is currently no sign of damp in the property.
Prime question. Can I leave all external walls and plasterboard intact, erect a touching super-insulated studwork including all plumbing and electrics first fix?