The Productivity Commission's latest report on government services, published on Thursday, showed five per cent of the territory's public housing households were overcrowded.

Only the Northern Territory had a higher proportion, 7.4 per cent, at June 30 last year.

A household is considered overcrowded if, among other criteria, it has more than two people per bedroom.

The commission's report included data on the performance of each state and territory in the delivery of public housing and homelessness services.

National data was also included.

The results deliver mixed news for the ACT government, which has been keen to trumpet its investment in the sector in the face criticism that it is not doing enough to provide housing options for low-income earners.

The report showed the ACT's public housing stock had fallen to 10,955 dwellings at June 30 last year, down 226 on the same time the previous year.

Dwellings numbers have fluctuated in the past four years due to the government's public housing renewal program, which has seen more than 1200 units demolished and rebuilt elsewhere.

The government has committed to building an extra 200 units as part of its $100 million housing strategy.

The commission's new report showed the ACT continued to perform well in some metrics.

A total of $133 million was spent on social housing in the past financial year, a larger per capita investment than other states and territories.

It was the only jurisdiction in which 100 per cent of new property allocations went to people in the greatest need, such as those experiencing homelessness or at a safety risk.

However, the ACT rated poorly in other areas.

It has the highest proportion of tenants in the nation (20.6 per cent) who didn't believe the features of their property, such as size, number of bedrooms and security, suit their needs.

About 10 per cent weren't happy with the location of their unit.

The condition of almost one fifth of public housing units in the ACT did not meet "minimum acceptable standards", a proportion which was on par with the Australian average.

The latest results are a significant improvement on 2014, when the condition of almost 25 per cent of units were below standard - the highest rate recorded in any jurisdiction since 2014.

Nearly 75 per cent of tenants were either satisfied or very satisfied with Housing ACT's service overall, which was in line with the national average.

The report showed 3800 Canberrans received support from specialist homelessness services in the past financial year, down from nearly 5000 in 2014-15.

However, there was a marked increase in the number of people who haven't been able to access the support service they need.