As well as bragging rights, the Crawfords won the profit made on the property and an $80,000 cash prize.
Ben Crawford said he was feeling "a bit out of body" following the win.
"Financially it's bloody good. It's been such a crazy journey over the past 10 weeks. To win is the ultimate award."
The siblings revealed they had resigned from their jobs last week - Libby as a senior designer at a Christchurch advertising agency, and Ben as the marketing manager for youth at Tourism New Zealand - to start their own graphic design, marketing and branding business, because people had identified with the brand they had built up during the show.
It will be called Libby and Ben.
Their property and the three neighbouring houses on the reality series had the same valuations of $750,000 before renovations started.
Sarah Adams, 20, of Hamilton and Richard Boobyer, 24, made $64,000 on their property - the only weatherboard home on the series. It had a reserve of $806,000 but sold for $870,000.
New Plymouth couple Ginny Death, 22, and Rhys Wineera, 23 made only $11,000. They had a reserve of $794,000 and sold their home for $805,000.
Engaged Wellington couple Rachel Rasch, 35, and Tyson Hill, 36, reached their reserve of $798,000, but did not profit from the sale.