A twist ending to The Block NZ.

Nate and Andy have taken out the $100,000 grand prize after their house was put back up for auction late and scooped a $31,000 profit, the best of the evening.

Stace and Yanita looked to have won when their home sold for a $20,000 profit.

But a late decision to put Nate and Andy's home back up for sale changed everything, as late bids came quickly and pushed their profit higher.

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The four town houses, located on Northcote's Potter Ave, were expected to sell for upwards of $1.3 million.

But profits were disappointing as the four homes only made $65,000 profit in total.

With Auckland's housing market officially in a "cool down" period, some speculated not all of the houses would sell under the hammer, which would have been a first for The Block NZ.

Worst still for contestants would be a repeat of season one when Rachel and Tyson walked away empty handed when their house sold for its reserve price - and not a dollar more.

Last year, winning team Sam and Emmett sold their Meadowbank property for a staggering $380,000 above the reserve, netting them close to half a million dollars when added to the $100,000 prize money.

Today, the Herald on Sunday revealed the houses are being sold without Code Compliance Certificates as building work on the houses is not complete.

The site was purchased by Eyeworks New Zealand Limited, the production company also known as Warner Brothers NZ, for $1.9 million in July 2016.

The original two storey weatherboard house on the 926 sqm site was bowled and four identical units were built in April this year.

The Northcote houses are the biggest Block houses yet, have roof-top gardens and boast views over the harbour and Rangitoto.