Auckland's average house price rose one per cent last month to $573,071, the second highest average sales price for the year.
Peter Thompson, managing director of Auckland's largest realtor chain Barfoot & Thompson, said volumes were up too after 714 houses were sold, the best December in five years.
Volumes were also more than a third higher than in December 2010, he said.
"December was extremely active and it has given early momentum to January's market. In part, the strong finish to the year was assisted by there being three full weeks of trading leading up to Christmas," said Thompson.
"Although December was an excellent sales month, overall the Auckland market remains restrained. House prices are increasing only modestly, with the difference between the average price achieved for all of 2011 at $543,124 being 2.5 per cent higher than for the 2010 year.