I am looking to undertake a loft conversion and wish to minimise the space taken up by new stairs leading to the loft. My intention is to construct new stairs within a corridor that I will create from part of an existing bedroom which will become the bathroom. The existing stairs lead directly from the main entrance and the two rooms either side (at ground level) will have fire rated doors. Upstairs, there is a bedroom to the right which will have a fire rated door and to the left there is a corridor with access to the new bathroom (no need for a fire rated door I believe) and at the end of the corridor will be a bedroom which will have a fire rated door. So, I would like to construct my loft stairs parallel with the existing i.e. walk up the exsiting stairs and turn left to proceed up to the loft. My question is, do I need to put a fire rated door at the bottom of my new "stair" corridor. If so then I would need to set my stairs back into the room which causes some issue as the room is not particularly wide. Alternatively, can the fire rated door (if I do actually need one) go at the top of the stairs where they enter the actual loft conversion? As another altrenative, is it possible/permissiable to have sliding fire rated doors?