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I'd imagine its because the ground floor receptions and extension effectively are one space and there is adequate means of escape at the front and rear. If escaping from above and the ground floor is on fire somewhere - the stair case is enclosed as a protected route to the front door exit via the hall.
The more problematic situation is when a stair comes down into a living / kitchen space with no hallway to the exit door. You then require a fire suppression (mist / sprinkler systems).
So good.
How did you manage to pass building control with those inset-into-doorframe steps leading up to the living room?
Our builder is adamant that we'll need to put in temporary steps which don't incorporate the door frame, and a fire door, to pass BC.