The following are companies known to specialise in providing supplies or services for the maintenance of historic buildings. The suppliers are listed under headings representing the kinds of issues that may need fixing. Some suppliers may appear under more than one heading.
The listing of a supplier here does not mean that they are a preferred supplier. There may be other suppliers equally or more appropriate who have simply not yet made it to this list.
You should make your own assessment as to the suitability of a supplier in your specific circumstances. Furthermore, lists such as this are changing all the time and it is possible that, at the time you access it, it is not 100% up to date.