New Zealand Law
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There isnt a precise percentage which qualifies, but you would be justified in this case because anything over 10% is generally regarded as extra. So you need to send them a proper construction claim with the variation, so they can if they want, respond with a schedule
This has come up as an old question. For some reason it slipped through the system, and has not been answered. I can still answer if there is still a reason to get this answer.