Also...
with doing things to your house that require planning - you can (theoretically) do what the fuck you like.
Until someone complains.
Then you (sometimes) have to undo it all.
Sometimes the complainant can be an eagle-eyed planning officer, but more often than not a grumpy neighbour who wasn't allowed to do what you did do, or simply a jealous curtain-twitcher.
When my wife sold her maisonette, we didn't have any of the paperwork for tiny extension that was built way before she built it (not sure how/why it wasn't an issue when she bought it), but the buyer just wanted indemnity insurance that cost us about £14.
Also...
with doing things to your house that require planning - you can (theoretically) do what the fuck you like.
Until someone complains.
Then you (sometimes) have to undo it all.
Sometimes the complainant can be an eagle-eyed planning officer, but more often than not a grumpy neighbour who wasn't allowed to do what you did do, or simply a jealous curtain-twitcher.