I’d focus on finding someone who is comfortable managing bigger renovation work, not just cosmetic updates. My cousin did a similar project, and the complicated parts were the structural changes, council steps, sequencing the trades and dealing with a few exterior issues that showed up once work started. It helped to look at companies that also understand recladding, remediation and general construction, because older homes can reveal surprises. I came across https://www.adronconstruction.co.nz/ while reading about Auckland builders, and kept it as a reference because their work seems connected with full house renovations, alterations, recladding and wider building projects.