The short answer
A listed building is protected as a whole, roof included, so a job that would alter its character needs consent from Wiltshire Council. The parish church follows the Church of England's own faculty system instead. A neighbouring private house gets no such exemption, so it pays to ask the council before changing a covering.
The church of St Peter and St Paul stands at the heart of Great Somerford, and the Mount House is not far from it. Both are listed, and the listing shapes how roof work is planned nearby. This answer covers what that means for an ordinary house in the village.
Q1.1What does a listing actually protect?
A listed building is protected as a whole, roof included. Anything that would change its character calls for listed building consent from the local planning authority, which here is Wiltshire Council. Swapping a covering for a different material, altering the pitch or changing a chimney can all count. Refixing a few slipped pieces in the same material is another matter, but when in doubt, ask the council before work begins. Breaking the rules is an offence, and no roofer should start without knowing where the line falls.
Q1.2Why is the church treated differently?
Church of England worship still goes on in the parish church, so the ecclesiastical exemption applies: changes go through the church's own faculty system, not through listed building consent. A private house beside it gets no such exemption. If your house is listed, or stands close enough to the church that its roof forms part of the view, the council's conservation officers are the people to ask.
Q1.3What happens on a survey of an older roof?
We photograph every slope, verge and flashing and note which parts are original. The ridge, the line along the top where two slopes meet, gets particular attention. The written quote then describes the repairs we propose, so you and the council can see exactly what is intended. Our roof repairs page explains the process, and the page on tiled roofs in conservation areas goes further.