The counterpoint is my folks did it. there was lots of back and forth with planners, but they were able to significantly extend a grade II listed cottage and are now beyond happy with their house. It's doable.
This. It can be very dependent on your local conservation officer as well.
The absurdity of the bureaucracy means that my neighbour needs to apply for planning permission, and listed building consent to replace grim aluminium window frames, because they were present when property was listed!:
The counterpoint is my folks did it. there was lots of back and forth with planners, but they were able to significantly extend a grade II listed cottage and are now beyond happy with their house. It's doable.