mattwnz: IANAL. But I understand all new houses are also covered by 10 years of implied warranties, and 1 year defects period under the building act. https://www.building.govt.nz/projects-and-consents/why-contracts-are-valuable/implied-warranties-and-defects
We’re outside of our 2 year “defects” period, and the 10 year one is a MasterBuild warranty which after 2 or 3 years (can’t remember which) only covers structural problems. So no help there.
I thought it would be a clear cut CGA issue, but perhaps not?