New Zealand Law
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If you were given an estimate of the construction, then it is well-established law that the estimate should not be exceeded by 10%. This builder has therefore gone well over what is regarded as reasonable. If you did ask them to do extra work, then this of course should be charged as a variation and approved by you. Sometimes builders will add a surcharge to the sub trades and bill this to you, but if you asked for the sub trades to be billed direct, then he should not have done this. The delay would have meant considerable cost if this was working wool shed, and you are entitled to damages for any of the disruption. You have good remedies under the Construction Contracts Act, and what you need to look at his last bill and ask if this is a construction claim. It should state that it is a construction claim on the document. Within 20 days of receiving that claim you must respond with a schedule which explains why you refuse to pay the items, and list the extra costs. You can then get a construction adjudicator to look at his claim and your counterclaims and make a binding decision. This is a reasonably quick process. I can recommend construction adjudicators if you want one