In NSW house values rose 5.2 per cent in the first five months of 2009 and 3.5 per cent over the year to May.

Looking at other capitals, Melbourne was up (6.1 per cent) and Darwin (5.5 per cent).

However, yesterday the Housing Industry Association says new home sales in NSW fell 10 per cent in May, and believes the amount of building in the state would hit a record low in the 2008-09 financial year.

The trends have convinced some economists that house prices have bottomed, but questions remain over the sustainability of relying on first-home buyers to prop up the market.