House vendors using Quotable Value to set their selling price are being warned they risk costing themselves out of the deflated market.
Real estate insiders say homes are selling for tens of thousands of dollars below their QV rating - raising the possibility of long waits for sellers unprepared to compromise.
"The situation is that QV are using out of date sales to arrive at a market worth," said David Lugton, of Hamilton firm Lugton's Real Estate.
"It is computer-generated so may not be reliable. You have to treat the moving market with caution."
Steven McNamara of valuation specialists Property InDepth said that in a perfect world there wouldn't be any difference between valuations and selling prices.