Auckland was the only region to see housing stock levels increase - up 4 per cent.
House asking prices in Auckland hit a new all-time high at $933,435 in September, up 2.8 per cent on the previous month.
Taylor said fewer new listings meant sellers were looking to command higher prices.
"On the other hand, if there were no new listings coming onto the Auckland market, all existing properties would now take 12 weeks to sell, which indicates a slow-down in activity," she said.
Buyer sentiment had appeared to shift from a "must buy now mentality" to a more considered view of options, Taylor said.
In Wellington new property listings fell 8.1 per cent in September.
"Wellington is an example of the unpredictable nature of the industry at this time, given that in August 2016 new listings increased by 36.8 per cent compared to August 2015," Taylor said.
Property asking prices in Wellington rose 1.4 per cent compared to the month prior.
New listings fell 4.7 per cent in Canterbury and 12.6 per cent in Otago.