The obligation is new. The number underneath it is the part worth reading.

The NSW Government will require Sydney councils to identify and maintain at least 30 years of feasible housing capacity, an obligation that will form part of the Sydney Plan once that plan is finalised. The word carrying the weight in that sentence is feasible. The requirement responds to a NSW Productivity and Equality Commission report released on 29 July which found that of roughly 1,371,000 new homes currently zoned under Sydney council plans, only about 23 per cent are commercially viable to build at current prices. The rest exist on paper.

That is the story. Not the 30 years.

What was actually announced

The Premier and the Minister for Planning and Public Spaces announced on 29 July that councils will need to update their local strategic planning frameworks to include an ongoing requirement to continually identify and maintain at least 30 years of feasible housing capacity in their local government areas. The government has framed this as turning long term housing planning into a standing obligation rather than a one off exercise.

Three practical details sit underneath the announcement.

• The Department of Planning, Housing and Infrastructure will work with councils over the next two years to prepare updated strategic plans that meet the requirement.
• Where councils do not meet it, the government has said it will step in through state led rezonings or other planning reforms.
• The requirement will also be included in other region plans where five year local government housing targets are being set, which extends it beyond Sydney.

The timing matters for anyone reading this as an immediate change. It is not one. The draft Sydney Plan went on public exhibition from 10 December 2025 to 27 February 2026, and the department is still reviewing submissions and preparing the final plan. No finalisation date has been published. The requirement bites when the plan is finalised, and councils then have a two year runway. The full announcement is on the NSW Government website.

Why does only 23 per cent of council zoned capacity stack up?

The Commission assessed Sydney capacity using the Department of Planning, Housing and Infrastructure Development Capacity Model, separating what planning rules permit from what is commercially viable to build.

Zoned capacity and feasible capacity are not the same thing

Zoned capacity is the number of additional homes planning rules permit. Feasible capacity is the subset of those homes that would also cover construction costs plus a reasonable developer margin at current sale prices.

The Commission uses this example. A suburb with 5,000 existing dwellings where planning rules allow another 1,000 has zoned capacity of 1,000. If only 500 of those are profitable to build, feasible capacity is 500. A six storey building zoned for eight storeys adds capacity on paper, but the cost of buying and demolishing the existing building to gain two floors rarely works.

This is why zoned capacity is often described as theoretical.

Two findings explain the gap between the two numbers.

The first is location. Almost 75 per cent of the zoned capacity under council plans sits in Sydney west, where apartments, and to a lesser extent townhouses and duplexes, are less feasible to build.

The second is height. Around 80 per cent of residential land within 10 kilometres of the Sydney CBD carries council zoning for just one or two storeys. In the parts of the city where the numbers work best, council controls cap what can be built. By contrast the Commission estimates around 50 per cent of the capacity created by recent state reforms is feasible, because those reforms targeted the east and north. That includes the Transport Oriented Development precincts, the Low and Mid Rise Housing Policy, major state led rezonings, and roughly 150,000 homes the Housing Delivery Authority has determined eligible for state significant development assessment.

For context, the Commission notes Wellington was also found to have a feasibility rate of 23 per cent. The number is low but not unique to Sydney.

What actually stacks up, and where

The Commission published its cost and feasibility modelling, prepared by the Centre for International Economics, alongside the main report. This is the part of the release with the most direct read for people who price and build residential work.

For a seven storey infill apartment in Sydney, total development cost per dwelling rose from about $917,000 in 2023 to about $1,049,000 in 2025, a lift of 14 per cent. Construction was the largest driver, up 18 per cent. Against an average sale price excluding GST of about $1,103,000, that leaves a positive feasibility gap of 5 per cent on top of the 20 per cent margin developers typically require. In 2023 the same gap was 13 per cent. It has more than halved in two years.

Height changes the arithmetic. A 16 storey apartment came in cheapest per dwelling at about $982,000, because land cost spreads across more homes. A 26 storey apartment was the most expensive at about $1,115,000 and modelled at a feasibility gap of minus 1 per cent, because construction cost per square metre climbs faster than land cost falls.

Greenfield detached housing tells a different story. Total development cost rose from about $753,000 in 2023 to about $890,000 in 2025, an 18 per cent increase. Construction alone went from $328,000 to $418,000, up 28 per cent, the fastest moving component in the model. Against a sale price of about $1,184,000, the feasibility gap remains 33 per cent, down from 42 per cent in 2023. Cost growth is eating into it, but greenfield houses remain comfortably feasible.

Apartment development is generally only feasible east of Parramatta. West of it, what stacks up is detached houses, duplexes and townhouses.

That is the single most useful line in the whole package. The modelling puts mid rise apartment feasibility above 30 per cent in parts of the eastern suburbs, Northern Beaches and Sutherland, and negative across large areas west of Parramatta. Yet the Commission estimates roughly 60 per cent of the zoned capacity west of what it calls the feasibility line is mid and high rise apartments. Those numbers sit against wider conditions in the Australian construction industry, where cost growth has outpaced price growth across most residential segments.

The finding that cuts against a lot of industry advocacy

The report is direct on what does not fix feasibility. It finds that waiving state taxes and charges on private developers, including infrastructure contributions, would deliver little to no benefit for housing feasibility, while adding significant infrastructure costs to taxpayers and potentially undermining future supply increases. Lower interest rates help only to a point. Even a 20 per cent reduction in construction costs would not match the gains available from upzoning in high demand areas.

That sits awkwardly against a good deal of industry advocacy in NSW. The Property Council NSW pre budget submission earlier this year sought suspension of the Housing and Productivity Contribution and deferral of local and state infrastructure contributions to the occupation certificate stage, arguing that cost and timing barriers are what stop approved projects reaching construction. It cited Urbis research finding three in four approved apartments in metropolitan Sydney since 2020 had not progressed to construction. The Council has welcomed the feasibility led framing of the new requirement, while continuing to argue that the test of success is homes constructed rather than homes permitted.

Both positions can be read from the same evidence. The Commission is not disputing that costs are high. It is arguing that the larger constraint is planning rules blocking projects that already stack up, and that relieving charges transfers cost to taxpayers without moving many projects across the line.

Why abundant capacity is framed as a productivity question

The report ties feasible capacity to construction capacity, and the historical example it uses is worth knowing.

During the late 2010s apartment boom, NSW completions peaked at around 75,000 dwellings a year, close to three times the annual rate of about 27,000 earlier in that decade. The construction workforce grew by only about a third over the same period. Most of the increase in output came from more homes delivered per worker rather than more workers entering the industry. The Commission notes a comparable outcome in Auckland after its planning reforms, where homes built per worker more than doubled.

Two mechanisms are identified. Larger projects spread labour, equipment and materials more efficiently than the same number of homes delivered across hundreds of separate sites. Apartments are also typically smaller than detached houses, so more dwellings come out of a given amount of construction activity.

The report then names four planning conditions it says hold firms back: zoning and tax settings that keep firms and projects small, a long and uncertain regulatory environment, planning controls that vary across and within local government areas, and overly prescriptive application of planning guidelines. The third of those is the one most builders will recognise. Controls that change from council to council raise the cost of entering a new market, which is a practical constraint on scaling a building business across more than one local government area.

The argument the Commission puts is that a predictable pipeline of well located, feasible sites is what gives firms the confidence to invest in equipment, systems and technology. Australian housing construction productivity has fallen since the 1990s while whole economy labour productivity rose around 50 per cent. The report positions planning certainty as one of the levers governments actually control.

What is not settled yet

Four things are worth holding lightly.

• The Sydney Plan is not finalised and no date has been published for it. The requirement does not exist as an obligation until the plan does.
• The draft Sydney Plan is framed as a 20 year strategic land use plan for 33 local government areas, while the new requirement asks councils to hold 30 years of feasible capacity. How those two horizons are reconciled is a detail for the final plan.
• The Commission recommended five, ten and twenty year housing targets for local government areas, with feasible capacity requirements set similar to the New Zealand 30 year feasible capacity target but tailored to NSW using historical take up rates and the state own planning horizons. The government has gone with a flat 30 years.
• The government statement that the requirement will effectively double feasible capacity again over time is a government characterisation. The report models recent reforms as having more than doubled feasible capacity for five to six storey apartments within 10 kilometres of the CBD. The further doubling is a projection, not a modelled result.

One more distinction separates this from most of the coverage. The report carries an explicit disclaimer that Commission recommendations only become NSW Government policy if the government explicitly adopts or actions them, and that it may adopt them wholly, in part, or in modified form. The 30 year requirement is one recommendation the government has picked up. The rest, including relaxing heritage conservation area controls and car parking minimums, remain advice. The full report is available through the Commission document library.

What this changes for builders

Very little this financial year, and that is worth saying plainly. This is a council planning obligation with a two year preparation window attached to a plan that has not been finalised.

What it does is signal where NSW intends to create pipeline, and the modelling underneath it is more useful than the announcement. The feasibility line east of Parramatta, the 33 per cent gap still sitting in greenfield detached product, the 28 per cent two year rise in greenfield construction cost, and the finding that 16 storeys is cheaper per dwelling than either seven or 26, all describe where residential work is likely to be commissioned over the next several years and in what form.

The Good Builder Take

The 30 year headline is the least interesting part of this. The number to remember is 23 per cent. Three quarters of the housing capacity sitting in Sydney council plans is not buildable at current prices, and most of it is in the wrong half of the city.

For builders, the practical read is about product and location rather than policy. Apartments generally do not stack up west of Parramatta. Detached houses, duplexes and townhouses do, and greenfield detached work still carries the widest margin of any typology in the modelling despite construction costs rising 28 per cent in two years.

The honest caveat is that none of this is decided. The Sydney Plan is unfinalised, most of the report remains advice rather than policy, and the doubling claim in the announcement is a projection. Worth watching. Not worth repositioning a business around yet.

Frequently asked questions

Sources: NSW Productivity and Equality Commission, Building more homes where the numbers stack up, July 2026, and the accompanying cost and feasibility modelling prepared by the Centre for International Economics. NSW Government ministerial media release, 29 July 2026. NSW Planning Portal, draft Sydney Plan exhibition record.

Disclaimer: This article is general information only. It is not legal, financial, or planning advice. The Sydney Plan has not been finalised at the time of publication and the requirement described here is not yet in force. Recommendations by the NSW Productivity and Equality Commission do not become government policy unless explicitly adopted. Figures are as published by the sources cited. Builders and trades professionals should seek independent advice relevant to their circumstances before making business decisions.

Author: TGB Editorial