The company i work for built a house 210m2 (thats the closest in size i could find to yours) last year and the metal roof cost $3000 inc GST if thats any help.
ahhh but dont forget that building companies get cheaper rates for materials hon and for the $3000 does that include the labour or just the cost of the metal? Does it include guttering, capping, timber needed to 'straighted' the roof for the sheeting to go on (which would have to be replaced aswell). Im pretty sure metal prices went up november from what J told me (he's a building supervisor)

OH and just a thought to...prices may go up AGAIN as Comalco...blue steel what ever its called now in Hastings had a huge explosion not long ago (SIL works there) and they seem to think that metal prices might get more $$$$$

ETA - Ive jsut realised i know way to much in regards to building...Ive gotta get J to shut up when he comes home from work