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HIA’s analysis finds that outdated minimum lot size rules embedded in planning schemes across Australia are preventing new homes from being delivered in established suburbs, making it near impossible to meet the National Housing Accord target of 1.2 million new homes.
“Governments are setting housing targets with one hand and shutting down supply with the other,” said HIA Executive Director Planning & Development, Sam Heckel.
“You cannot meet housing targets while leaving 1950s planning rules untouched,” said Mr Heckel.
HIA data shows housing construction remains well below the 240,000 homes a year required to meet national targets, while land prices have surged to record highs. Despite this, up to 80 per cent of residential land in many cities remains locked into low-density zoning or similar with minimum lot sizes that effectively prohibit subdivision.
“These rules are a political choice, not a technical necessity,” he said.
“They were designed for a completely different time, yet governments continue to protect them even as affordability collapses.
“Minimum lot sizes are one of the easiest supply constraints for governments to remove yet remain largely untouched because of political reluctance to reform suburban planning controls.
“Governments keep talking about affordability, but this is where it is being lost.
“Smaller, sensible lot sizes in well-located suburbs would deliver more homes quickly, without high-rise development and without major infrastructure spending.
“Concerns about overdevelopment are being used as an excuse for inaction, despite the fact subdivision is already limited by stormwater rules, flooding, demolition costs, heritage protections and market demand.
“The market already decides where subdivision works and where it doesn’t. What governments are doing is stopping it everywhere, regardless of context,” said Mr Heckel.
“HIA modelling shows reducing minimum lot sizes from 500sqm to 300sqm would cut the land cost of a new home by more than $200,000 providing immediate relief for first home buyers and downsizers.
“This is a fast, low-cost reform that governments could implement tomorrow.
“If governments are genuinely serious about housing supply and affordability, minimum lot sizes must go. Continuing to defend them means accepting higher prices, lower supply and ongoing failure to meet housing targets,” concluded Mr Heckel.
New Housing Industry Association (HIA) analysis shows state and local governments are actively blocking housing supply while publicly committing to fix affordability.
The Housing Industry Association says recent global uncertainty is highlighting the unique pressures faced by Australia’s residential building industry, where fixed price contracts remain the norm.
“Tasmania recorded a modest improvement in detached home building at the end of 2025, as Australia’s housing construction sector showed clearer signs of recovery,” stated HIA Executive Director – Tasmania, Benjamin Price.
“There were over 10,000 multi-unit starts in New South Wales in the December quarter 2025, the highest since late 2018,” stated HIA Executive Director NSW Brad Armitage.