Not that we're in NZ, but we reroofed 5-10 years ago. Our materials have a guaranteed lifetime of 25 or 35 years. I think the metal roofs last even longer, though I believe the cost would also be more. I think we paid 5,500USD at the time, including stripping the three previous layers and adding a plywood underlayer. We have a couple of gables, but nothing fancy.
When you're looking to buy, I recommend asking how old the roof is, and how long it is rated for. Take a look at it, and see if there are warped or missing shingles or rust blisters (depending on the material). Those would suggest that the roof needs to be replaced soon. It could be a bargaining point. I'm not sure what the custom in NZ is for home inspections and disclosures.
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If men had wings and bore black feathers, few of them would be clever enough to be crows.
- Rev. Henry Ward Beecher, mid-1800s
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