New Plymouth couple Cat and Jeremy won the first reveal, while Hamilton sisters Sarah and Minanne earned one of the lowest scores in The Block NZ history, scoring just 5.5/20.
The sisters, who are also the youngest contestants to star on The Block NZ, came unstuck when their paint selection - a subtle lavender - turned out to be closer to Pepto-Bismol pink.
Earlier in the week, the renovation series debuted to its lowest ratings ever, with 104,000 (25-54) viewers tuning, before dropping even further on Wednesday night to 85,000 (25-54).
Herald writer Calum Henderson praised the local debut of Grand Designs and its host Chris Moller, writing: "Beautifully shot, faithful to the original format in all the right places, but with a strong and unmistakably New Zealand heart, it was better than anyone had any reasonable right to expect."
What we watched last night:
Top 5 Programmes (National 5+)
1). One News, TV One, 6pm : 648,000
2). Sunday, TV One, 7pm : 505,000
3). Topp Country, TV One, 8pm : 441,000
4). Grand Designs NZ, TV3, 8.30pm : 319,000
5). Winter, TV One, 8.30pm : 294,000
Top 5 Programmes (25-54)
1). Grand Designs NZ, TV3, 8.30pm : 190,000
2). One News, TV One, 6pm : 182,000
3). Sunday, TV One, 7pm : 158,000
4). The Block NZ, TV3, 7pm : 138,000
5). Topp Country, TV One, 8pm : 135,000