Westpac says the property market will be affected by the foreign buyer ban.

House sellers have reached all-time levels of optimism over the prices they can sell their properties for, according to property sales web business realestate.co.nz.

It said September ended with vendors setting a "national all-time high" average asking price since, along with all-time highs in six regions.

Once again, it is Auckland where expectations, and activity, was highest.

"The new listing deluge is led by the Auckland region with owners adding 3896 homes for sale to the site, up by nearly a third (31.9 per cent) compared to September 2017," said realestate.co.nz spokesperson Vanessa Taylor.

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CHRIS GORMAN/STUFF Auckland is a city where average comes with a big price tag. Homes have an average asking price of just less than a million dollars.

Nationally, there were 10,372 new property listings in September, she said, which was an increase of 11.7 per cent on the same month last year.

The total number of properties on the block after all the new listing was 22,847, which was lower than in 2015.

"The reality is most Kiwis list their properties because they believe they can sell in the current market. That's about confidence," Taylor.

She believed many people selling their homes drew comfort from doing so when there were a lot of other vendors trying to do the same.

"In this market it's also less daunting to think about selling your home because there are more replacement choices."

LIZ MCDONALD/STUFF Auckland has most homes for sale, and the highest average asking price.

There appear to be a staggering number of people searching for properties.

"Property hunters are also out in force, with 838,706 unique browsers searching listings on our site across the country in the September month, which is right up there with summertime viewing levels," she says.

There are just under 3.95 million New Zealanders aged 15 or over, according to Statistics NZ estimates.

123RF Wellington on a sunny day. Great place to live, but its hard to find a house for a price that matches local incomes.

Auckland had 3896 new listings in September, said Taylor, with an average asking price of $977,988.

The average national asking price was $690,733, an increase of 4.8 per cent on September last year.

Southland saw a 21.2 per cent increase in new listings (274) compared to September 2017, with an average asking price of $318,177.

There were 688 new listings in the Wellington region (a 13.5 per cent increase), where the average asking price was 646,957.

IAIN MCGREGOR/STUFF Outstanding beauty. Outstanding prices. Tourist at top of skyline gondola. Views looking towards Queenstown and Lake Wakitipu. Kiwis hoping to buy a house in the area need very deep pockets.

Northland registered 406 new listings, an increase of 13.7 per cent with an average ask price of $588,375.

Five regions that had record high asking prices: Central Otago/Lakes ($1,105,462), Otago ($416,941), Wellington region ($646,957), Canterbury ($511,829) and Hawkes Bay ($524,607).

The West Coast region had the lowest average asking price ($294,144).