New roofing materias have a much longer life span than the older galvanised tin sheet. New UV reistant polymer coatings last much much longer. We had our sleep our re-roofed (8mx8m with a single ridge) for $3000. Granted the builder was doing a "cashie", so i guess $5000 would have covered it if it had been a "man off the street" scenario. So at $80 a m2 on plan - we got the old roof stripped, new underlay and stringing and coloursteel roofing sheets with a new ridge cap fitted.
If your roof isnt in such good condition - you can stabilise the rust and then paint it with acrylic roof paint - which will be good for about 5 years. It may be that the fixings are shot - the older syle use lead capped nails which can spring up over time and allow water under them or the flashings may need re-sealed or beaten back into place.
The cheapest roofs to re-roof are those with a single peak and straight runs down each side. Do-able in a day, no problem. Once you start getting hips, valleys etc then there is an awful lor more fiddling about to be done.
I would advise to get a builder to have a quick look - he would be able to give you a ball park estimate off the cuff I would guess.
Cheers
Nick
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