Ours is listed, I’d buy listed again in a heartbeat, it’s listed dor a reason, it’s unique with gorgeous original features,
Don’t assume you can’t replace the front door, speak to thr planners ans they will help you create a plan.
The general rule is you can do anything cosmetic inside, inc replace bathroom kitchen etc ( unless it is original or was in place at time of listing, which is highly unlikely) and is on the original listing. You cannot remove or rip out original features, not without consent, and you can’t change the structure
Outside you need to keep it looking as it did originally. Again unless you have consent. And consent does happen, people extend etc
These homes need to be lived in, this is what the government wants, else they would go to ruin, but you are preserving it for historical interest, hence why you can’t be ripping out original shit or changing its appearance. If you want to do that, don’t buy a listed home.
If there has been any changes structurally, or new outbuildings Ie garage built check planning permission was given, we have both these things on ours, we bought like that and have the planning documentation.
Generally though, unless there is pictures of the inside dating back. No one knows what was in the house when, unless it’s one of many. Ours is a one off, so if we decided to rip shit out, no one would know it was ever there, but we would never do that.