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Thanks!
I have absolutely no idea! We always did have a step down but I guess it was inside the room rather than door.
All the open plan places pass so not sure why you’d need anything extra? When we had our loft done they said we would either need fire alarms in every room or replace all doors with fire doors, maybe that’s the answer? We went fire alarms obvs. -
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).
Here ya go, on their site are prob best ones.
Looks much the same now except +4 odd years of wear and tear.
https://www.eckfordchong.com/walthamstow-house-extension