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Ring Waikato office and speak to graham, he is based in Hamilton but will know about if they have anything in Christchurch, just explain your looking to go over and ask him for 5 minutes, he's a nice bloke.
Our lasses dad is project manager at fletchers construction based on north island, but they sub everything out to alpha and another British kid called Adam who only takes British spreads on (apparently) if I get time ill get Adams number out for you, again nice kid, but appreciate the time difference and ask for 5 mins, he'll tell you about prices.
Think he offered me between $24-$30 nzd per hour when I was there, depending on what I could do, which is most aspects.
Don't get your hopes up they are not brilliant, it will be $1400 nzd, not £1400. Lot of Chinese out there at minute creaming the work doing 12 - 14 hrs p day.
All tape and joint work and gib stopping ( drylining ) didn't really get much info about rendering though.
Standard of living is great but luxury items like chocolate, imported beers, tobacco and vehicles are quite expensive, cars/vans don't rust (no salt) so for some thing 10 yr old you'd pay about £3000/$6000 more for a van or UTE ( truck )
That's all I know mate, hope it helps.