Lofts are a long way above ground level so you should consider fire escape routes. If you have a two-storey house, you have two options:
You can put an escape window into your loft room with enough space below it to allow rescue by ladder. You will also need to fit self-closing devices to the doors opening onto the staircase to make a protected path to the ground floor exit (the door to the loft room must be a self-closing fire door).
Alternatively, you can fit self-closing fire doors around the whole staircase so that the doors make a fully protected path to the ground floor exit.