Unaffordable, affordable, price-capped public housing

The ACT Greens want at least ten per cent of the government's newly acquired Ginninderra East site delivered as "price-capped affordable public housing." The diagnosis they are working from is accurate. The prescription they have written is, so far, a label on an empty bottle.

Canberra's "affordable housing" definition is a rebrand, not a solution

The Greens' core grievance is worth taking seriously before testing their solution. Under the ACT government's current definition, "affordable housing" is pegged to a percentage of market rents, not to what tenants can actually pay. For someone on a median Canberra wage, that still consumes roughly a third of their income. The Greens point out that in the 1990s, the same worker was spending around fifteen per cent. That shift is real. It reflects three decades of supply failure, compounding land costs, and demand-side subsidies that inflated prices rather than eased them. A policy that calls itself affordable while consuming thirty per cent of a median wage is not affordable; it is a rebrand.

The Ginninderra East site — the eastern portion of the former CSIRO Ginninderra station, which the ACT government recently purchased — is genuinely significant. Large, government-owned parcels close to an established city do not come along often. The argument that government ownership of the land creates an obligation to deploy it differently than a private developer would is a reasonable one. If the public is absorbing the acquisition cost, the public is entitled to ask what it gets in return.

"Price-capped" is doing enormous work without being defined

Where the Greens' announcement runs dry is in everything that follows the demand. "Price-capped affordable public housing — where the rent you pay is directly attached to the income you earn" is a workable concept. It is, roughly, what community housing providers attempt and what public housing was originally designed to deliver. But income-linked rents at below-market rates require a subsidy to close the gap between what tenants pay and what the dwelling costs to build and maintain. That subsidy has to come from somewhere: the government balance sheet, cross-subsidisation from market-rate dwellings on the same site, federal transfers, or some combination. The Greens' release names none of these. There is no figure for what ten per cent of the site would cost at income-linked rents. There is no indication of who carries the ongoing operational expense. There is no definition of what "price-capped" means numerically.

A cap tied to thirty per cent of median income looks very different from a cap tied to thirty per cent of the income of the bottom quartile.

That gap matters because "price-capped" is doing enormous work in this policy without being defined. A cap tied to thirty per cent of median income looks very different from a cap tied to thirty per cent of the income of the bottom quartile. The first might require modest subsidy. The second requires substantial, ongoing government commitment. Both are legitimately describable as "price-capped," and the Greens have not said which they mean.

Rent caps without supply-side thinking have a documented failure mode

The history of rent control in Australia offers a warning about caps applied without adequate supply-side thinking. Rent controls introduced in New South Wales during the First World War and revived through the Depression persisted, in diminishing form, until the mid-1980s. By then they had not solved affordability; they had simply reduced the stock of controlled tenancies through attrition, as landlords converted, demolished, or allowed controlled properties to decay. The Committee for Economic Development of Australia has been direct in its assessment: rent freezes and caps tend to worsen rental crises by suppressing the returns that attract new supply. The Australian Housing and Urban Research Institute takes a more measured view, distinguishing between blunt freezes and more targeted stabilisation tools, but it too flags the supply-side risk in low-vacancy markets. Canberra's vacancy rate has spent much of the past few years below two per cent.

Income-linked public housing is coherent — but only if it's actually public housing

None of this means income-linked public housing is a bad idea. It means it needs to be genuinely public housing — funded, built, and managed as such — rather than a price cap applied to private or quasi-private supply, which is where caps tend to go wrong. If the Greens are calling for the ACT government to directly fund a proportion of dwellings on the Ginninderra site as public housing with rents set at a fixed share of tenant income, that is a coherent policy with real precedent. It is also an expensive one that requires the government to commit capital and carry ongoing operating costs. The announcement does not yet say that.

A political party in opposition is not obliged to publish a treasury costing with every media release. But when a housing announcement's central mechanism is a term that means whatever you need it to mean, the announcement is closer to a pressure campaign than a policy. The Greens' critique of Canberra's affordable housing definition is sharp and warranted. Their alternative, for now, is a commitment to deliver something that has not been specified, at a cost that has not been calculated, through a mechanism that has not been named.

The land is there. The need is documented. The next step is an actual plan.

Sources

ACT Greens — Ginninderra East must deliver new public homes, not 'affordable' housing in name only

CEDA — Rent freezes and caps will only worsen Australia's rental crisis

AHURI — Understanding rent control, rent stabilisation and rent regulation in Australia

Frequently Asked Questions

What is wrong with how the ACT defines affordable housing?
The ACT government's definition pegs affordable housing to a percentage of market rents, not to what tenants can actually pay. For a median-wage Canberra worker, that still consumes around a third of their income — compared to roughly fifteen per cent in the 1990s.

Why do rent caps tend to make housing crises worse?
When rent caps suppress returns below the cost of maintaining or building rental properties, landlords convert, demolish, or allow stock to deteriorate rather than invest. In low-vacancy markets like Canberra, that attrition of supply compounds the shortage the cap was meant to address.

What would income-linked public housing actually require to work?
Rents set as a fixed share of tenant income at below-market rates require a subsidy to bridge the gap between what tenants pay and what dwellings cost to build and maintain. That means government capital, ongoing operating funding, or cross-subsidisation from market-rate dwellings on the same site — none of which the Greens' announcement specifies.

Is there a difference between a rent cap and income-linked public housing?
Yes, and the distinction matters. A rent cap applied to private or quasi-private supply creates the supply-side risks documented in Australia's rent-control history. Income-linked rents in genuinely public housing — funded, built, and managed by government — avoid those risks but require direct, ongoing public expenditure that a rent cap does not visibly commit to.

What is the Ginninderra East site and why does it matter for housing?
Ginninderra East is the eastern portion of the former CSIRO Ginninderra station, recently purchased by the ACT government. Large, government-owned parcels close to an established city are rare, which is why advocates argue the site creates an unusual opportunity — and obligation — to deliver housing that a private developer would not.