Loss-making apartment sales rose to 12.6 per cent in the June quarter, in a further sign of moderating conditions in the housing market, CoreLogic RP Data figures show.

The proportion of standalone houses sold at a gross loss compared to their original purchase price rose was 7.7 per cent, unchanged from last quarter, and 12.6 per cent of all units sold at a loss, slightly worse than 12.5 per cent in the March quarter.

For all homes, the figure was 9.1 per cent of all transactions in the three months to June, up from 8.9 per cent in the March quarter and December's 8.6 per cent, the research company's latest Pain & Gain report shows.

Increasingly painful: In Darwin, more than a quarter of all apartments resold go for less than their purchase price, the latest CoreLogic RP Data Pain & Gain report shows. Glenn Campbell

While the national proportion of loss-making sales was little changed from March for both houses and apartments, patchy regional differences highlighted the now-familiar story of strong real estate markets in the eastern-state capitals while those in resource-dependent regions continued to suffer.

In the still-strong Sydney market, loss-making house sales fell to 2.2 per cent of all transactions from 2.7 per cent in March and the figure for apartments tightened to 1.8 per cent from 1.9 per cent.