You need a fire alarm and fire door. The fire door lets you stay in the loft while you wait for help, or isolate the rest of the house from a loft fire. The alarm gives you early warning, but you can't rely on then being able to get out immediately.
I'm in the same position, though I can't put the door at the bottom as there are two rooms off the new stairs. We have split-level and exposed trusses so it's very open looking across the stairs and I don't want to lose that. I think the compromise will be to built the ballustrade around the stairs to the required height, then glaze to the ceiling with suitable glass, but I'm a bit off working through the detail.
I'm in the same position, though I can't put the door at the bottom as there are two rooms off the new stairs. We have split-level and exposed trusses so it's very open looking across the stairs and I don't want to lose that. I think the compromise will be to built the ballustrade around the stairs to the required height, then glaze to the ceiling with suitable glass, but I'm a bit off working through the detail.