I think that, because every complex is different, the provision of hydrants, hose reels, fire doors and exit pathways and all the paraphernalia of fire safety provisions is highly subjective and specific to each scheme.
That said, I know there are calculations for the width of corridors that are contingent on the number of people who might need to get out in a hurry (one of the hidden dangers of overcrowding).
I also know that that the council or fire brigade can come in and demand a Rolls Royce fire safety upgrade but end up being negotiated down to a Toyota Corolla version, provide that its safe and the work is actually done.