If I were to install a new front door in a blank wall on the front of
my house, and don't get building control approval of the work, what
are the potential consequences? It's not a listed building and the
front door would open onto a piece of my own land.

Why don't I want to get building regs approval? Because it's a hassle,
it costs, and I know how to install a lintel properly etc. The house
isn't going to fall down...

Thank you,

Brad J