Heavy demand by homeowners desperate to access details about newly released property revaluations has now brought down the Quotable Value website.

A spokesman said the QV site had been down for about three hours today, as frustrated Auckland homeowners tried to learn the new value of their properties.

A notice on the homepage reads: "QV.co.nz is experiencing heavier load than anticipated. We are working to bring the site back up and apologise for the inconvenience."

The outage follows a major failure on the Auckland Council website after it was inundated by traffic yesterday, recording a 1000 per cent spike in hits.

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The council's acting chief finance officer, Kevin Ramsay, said the website continued to experience "intermittent technical issues" this morning as people tried to access the new 2014 property valuations, which were published yesterday.

The heavy demand meant thousands of homeowners have been unable to access their new revaluations and learn the new paper value of their single biggest asset.

The council apologised for the ongoing problem and said it was adding more IT resources and bandwidth to its website to help cope with the traffic.

"The website yesterday experienced a more than 1000 per cent increase in page views for a single day. On an average the site gets between 80,000 to 90,000 daily page views and yesterday, despite the intermittent site fluctuations, there were 977,968 page views.

"IT staff are working long hours to try to make the site more stable and resolve any of the technical issues involved and we apologise for the inconvenience."

The huge increase in people trying to access the council's valuations site resulted in it crashing nearly as soon as it went live.

Another program meant to solve the technical issues was made available later in the day, but that, too, was not fully functional.

The site was built by employees to deliver the three-yearly updates of property values.

The individual capital valuations are used by the council to set rates bills, and will be mailed to households from this week.

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The figures were set in July and rates calculations based on those figures will apply from July next year.

The average valuation increase for all properties in the city is 29 per cent, the council said last month. Residential properties have increased by an average of 34 per cent, commercial 16.4 per cent, industrial 15.7 per cent, lifestyle 17.7 per cent and rural 4.6 per cent.

Homeowners and Buyers Association of New Zealand chief executive Roger Levie said Aucklanders should be wary about the council values.

"The government valuation is not a reflection of the market valuation of a property."

Mr Levie stressed the importance of using a private valuer to assess a home's worth, especially if it was to be used as security for a bank loan.

"Often the government valuations are done without going into the property so no estimation is done for the quality or condition of the interior."

Peter Thompson, managing director of Barfoot and Thompson, agreed. "A house is worth what a person is prepared to pay ... It's not based on a mathematical equation."

However, he said the valuations were more relevant closer to their release date.

"People not planning to sell over this period of time will be wanting lower valuations and [vice versa]."

Exactly how the new rates will be calculated is still being decided, but draft versions will be put out for consultation in January when the community can make submissions.