I live in a flat and have become close friends with the lady in the
adjoining flat. We share the freehold on the property. We'd like to
put a door in the studwork wall that separates our two flats. I
understand this needs to be up to building reg standards with regards
fireproofing. Where can I find the correct
specifications/materials/thicknesses so that I can construct the door
and frame in compliance with the building regs? A drawing with
thicknesses indicated would be most ideal.

Thank you.

Rich