The short answer
Slowly and with consent. Radley's church and Wick Hall are both Grade II* listed, and changes to a listed roof that alter its character need listed building consent. Original material is kept wherever it can be, with repair ahead of replacement and a close match for whatever must be renewed.
Two of Radley's best-known buildings share a grade. St James the Great church, built about 1290, and Wick Hall, built about 1720, are both Grade II* listed. That tells you the roofs above them are treated as part of the history, not as a replaceable lid.
Q1.1Can a listed house be re-roofed in a new material?
Seldom without consent. Before anyone changes anything that bears on the special character of a listed house, consent has to be granted, and the roof covering plays a large part in that character. Slate for slate or clay for clay, laid the same way, is usually the route the council expects. Anything different, such as concrete tile in place of clay, would be a conversation to have before a quote is signed.
Q1.2Who decides what counts as matching?
The council's conservation officer, in the end. We help by writing down the size, colour, fixing method and supplier of what is proposed, and photographing the existing roof first, so the officer can compare like with like. On planning matters, Radley answers to the Vale of White Horse District Council.
Q1.3Does a church roof follow the same path?
Not exactly. Where a Church of England parish church is still open for services, the ecclesiastical exemption applies and a faculty is sought in place of listed building consent. Ours is the practical work of lead, tile and rainwater goods, once the church has the authority to proceed.
Should your own house be listed, begin by reading the entry itself, because it can take in outbuildings and walls as well as the main roof. Large listed roofs seldom fail all at once. Single lead rolls lift, hidden gutters clog and stone copings loosen, so a regular look from a safe vantage point finds small faults while they are still repairs.