So why does an extra floor make you prone to fire then? Id there was a
fire
on the ground floor stairs, trust me I wouldnt jump out the new floor.

Several reasons.

a) Much quicker to bolt down one flight of stairs and through the door than
2.

b) You might not notice the fire so quickly being so remote from it, so
downstairs
will be well alight before escape attempt made.

c) More rooms. More people to shift. More babies to collect. May need to go
up two flights of stairs to collect baby before returning to ground floor.
Need stairs not to be on fire during this procedure. Need smoke not to be
rising up staircase.

d) Jump out of 1st floor window: Broken leg if unlucky. May even be a porch
or conservatory to clamber on to. Jump out of 2nd floor window: Broken neck
if unlucky.

e) It is sensible to have the same level of protection for a 2 storey house
too.

Christian.