Doing it right now.
Through terrace and back to back so we’re ending up with an L shape. You do NOT need planning permission to make two dwellings into one. You DO need planning permission to split them back up again. You do need building regs though, but only so you can sell in the future.
Services are easy to hook up, don’t let anyone tell you it’s hard. You’ll need to get revalued by the council, again, easy.
Towergate insurance are good for insuring when you’re two houses, but kinda one.
Make sure you open up walls properly so you don’t end up with some kinda crazy warren; we’re tearing the stairs out from next door.
All the best; scariest and most exciting thing we’ve done – well worth it.