New Zealand Law
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Generally you should first discuss this with the builder and see what discount they will offer for the disruption and mistakes. Then if you cannot negotiate something, there are important steps to take for the final payment. The builder will give you a construction claim, and you must within 20 days respond with a schedule stating why you refuse to pay and cross claiming for the disruption. Then the next step would be for the builder to start a construction claim under the Construction Contracts Act where you can argue the matter. It can be a complicated process so getting a lawyer who understands this would be useful.