The short answer
Carefully, and with consent. On a Grade I building the aim is to retain original fabric wherever it can be saved, and to match materials where it cannot. Anything that alters its character needs listed building consent, so the plan is settled with the council beforehand and recorded in photographs as the work proceeds.
The priory church, the Priory itself and the Ladywell conduit house are all Grade I, which means the village's best-known buildings sit at the top of the protection scale. For homes nearby, the same attitude is a good model: look first, change little.
Q1.1What does repair mean on a listed roof?
Mend before replacing. Individual slates or tiles that have slipped can be refixed, a cracked one swapped for a matching salvaged unit, and failed lead patched or renewed in the same code and the same dressing. Sheet lead is graded by thickness and weight, and for a roof that is expected to last, the heavier codes are usually the sensible choice. Our lead roofing page covers codes and detailing.
Q1.2Why does mortar matter so much?
Old masonry was built with soft lime mortar that lets moisture escape. Hard cement mortar traps water in the stone or brick, which then decays around it. Pointing a chimney or a coped gable in cement is a common well-meant mistake. Lime is the better choice, applied by someone who can match the colour, texture and joint profile of what was there.
Q1.3Who needs to approve the work?
The legal route is listed building consent, which Wiltshire Council's planning and conservation officers decide, and it applies to any alteration that changes what makes the building special. Churches in use for worship by certain denominations, including the Church of England, follow a separate system with its own approvals, so the parish or diocese is the first call there. For Building Regulations, Wiltshire Council's building control team or a registered building control approver handles notifiable work.
A short survey with photographs tells you what is wrong before anyone commits to a plan. If the roof already leaks, our roof repairs page explains what a make-safe visit involves, and why we choose the smallest job that properly mends the fault, however old the building.