A landowner in Narrows Landing and Tamahere, who asked not to be named for commercial reasons, said the biggest problem was that landowners would now be in limbo until the agency offered them deals.
"They have to quicken the timeframe otherwise it holds everyone to ransom because you can't do anything with it. They've made all the land non-saleable.
"I think there should be counsellors here to counsel people as this has destroyed whole lives."
He said that while he supported the new roading in principle, residents could not be left in limbo.
The new roading network will also carve through the 18-hole Narrows Golf Course. Club president John Bridle said the club would begin working on what it would do after hearing of the plans this week. Members were still being briefed.
"It's business as usual. This is still 10 or 15 years away."
Transport Agency state highway manager Kaye Clark said the agency did not usually start buying land from affected parties until about two years before construction was set to begin.
Property owners would be waiting at least eight years before the agency paid them out.
She said it was too early to tell how many properties would be affected but it could be several hundred.