You're onto the public highway in your front garden so it's a fair question. We've got planning for a fence and gate across our driveway, but I see lots of bin stores and similar which I doubt have/need planning.
my building's management company had some fitted the other week and 99% sure didn't sort PP. Was booked before I moved in but I do wonder if they needed it.
Are you allowed to build a bike shed in your front garden in London, Islington, ?