The latest data on home values suggests the cost of buying a home in Canberra is stabilising.

But the CoreLogic Home Value Index has shown significant differences between the cost of houses and units in the capital.

Among capital cities, Canberra is the third most expensive market for overall dwellings, with a median price of about $845,000.

That figure is 1.5 per cent higher than this time last year, but down 0.2 per cent over the last three months.

Only Sydney is a more expensive city for houses, with Canberra's median value just shy of $968,000, a dip of 0.3 per cent in the last month.

The data suggested Canberra's units, however, are decreasing in value, down 2.3 per cent over the last year to about $580,000.

CoreLogic's head of research, Eliza Owen, said the ACT was coming off a higher base after strong price growth in the 2010s, which has been harder to sustain as interest rates have risen.

"ACT also saw a spike in unit completions from 2019 to 2023," Ms Owen said.

It is not the only set of numbers suggesting Canberra's housing market is cooling.

Separate data from CoreLogic has revealed 560 properties came on to the market in Canberra in the last four weeks.

It represents a decrease of more than 20 per cent on this time last year, the biggest decrease of any capital city.

The total number of properties for sale is just shy of 1,800, which is down 13 per cent on the figure 12 months ago.

Meanwhile, the Housing Industry Association says building approvals for new houses in the ACT decreased by about 12 per cent over the last three months.

Only Tasmania recorded a bigger decline.