The Australian Construction Industry Forum’s May 2026 forecasts are out, and the shift from November 2025 is striking. What looked like a soft landing has become something harder. Builders who understood the upside in 2025 need to understand the downside risks now in 2026.

Six months ago, the outlook for Australian construction was cautiously optimistic. The industry had grown 3.6 per cent through 2025. Interest rates were easing. Residential approvals were improving. The narrative was a slow but credible recovery from the post-COVID cost shock.

The May 2026 update from the Australian Construction Industry Forum has changed that picture.

According to the ACIF May 2026 Forecasts, growth in the construction industry could be brought to a standstill. The central projection is a contraction in total construction work done of 0.8 per cent across 2026. That is not a dramatic collapse. But it is a reversal that no one predicted six months ago, and understanding why it has happened is essential for any builder planning their pipeline.

What Changed Between November 2025 and May 2026

The ACIF’s Construction Forecasting Council chair Nerida Conisbee framed the shift directly: since the November 2025 report, the operating environment has shifted materially. What had looked like a cautiously managed soft landing has become a more difficult and volatile outlook.

Three factors drove the revision: a surge in fuel prices, renewed inflationary pressure, and the prospect of higher interest rates.

The fuel price movement is the most acute. The Strait of Hormuz closure following the escalation of the Middle East conflict pushed diesel above $3 per litre across Australian capital cities. Construction is the most diesel-dependent industry in the Australian economy, contributing 79 per cent of the construction sector’s energy use according to the Civil Contractors Federation. When diesel moves, construction costs move with it across every part of the build process.

The ACIF’s own commentary is explicit: the forecasts reflect the knowledge that this industry is particularly exposed to the impact of changes in interest rates. This impacts on demand and on costs, compressing margins and placing more stress on an industry that already tops the industry count for insolvencies.

The ACIF’s May 2026 forecasts project a 0.8 per cent contraction in total construction work done for 2026. In November 2025, the same forecasters projected growth. The shift is driven by fuel prices, inflation and interest rate uncertainty.

What a 0.8 Per Cent Contraction Actually Means

In percentage terms, 0.8 per cent sounds small. In dollar terms, it is significant. The construction sector was forecast to deliver approximately $334 billion in work done in 2024-25. A 0.8 per cent contraction represents roughly $2.7 billion in work that does not proceed.

More important than the aggregate number is how that contraction distributes across the sector. Contractions do not hit evenly. They hit the margins of viability first.

Projects that were marginal in November 2025 are unviable in May 2026. Developers who were considering breaking ground have paused. Builders who priced work on 2025 cost assumptions are delivering it in a 2026 cost environment. The contraction in work done is partly a direct consequence of work that cannot be delivered at the price it was contracted for.

Insolvency data reinforces this. In FY 2024-25, a record 3,596 Australian construction companies entered external administration for the first time, up 21 per cent on the prior year. That was before the full fuel cost shock had flowed through. The ACIF revision suggests the insolvency pressure on exposed businesses has not peaked.

The Interest Rate Dimension

Interest rates are the second major variable. Rate reductions through 2024 and into 2025 were a key driver of the residential approvals improvement that was feeding genuine optimism.

The renewed inflationary pressure from fuel and supply chain disruption has complicated the rate picture. Inflation was running at 5 per cent in the year to June quarter 2026 according to Treasury forecasts. That is not a rate environment in which central banks are comfortable cutting. The prospect of higher rates, or simply rates staying higher for longer, changes the feasibility calculations on residential projects, particularly medium and high-density apartment developments where financing costs are a larger share of total project cost.

ACIF has consistently noted that the construction industry is more sensitive to interest rate movements than most sectors. When rates move, demand for new homes, commercial fit-outs and development projects moves with them. The rate uncertainty alone creates hesitation in clients that translates into delayed decisions and a quieter inquiry pipeline.

Which Sectors Feel It Most

Residential building is the most directly exposed. The ACIF data shows that the residential building recovery that was gathering momentum through 2025 is now under pressure from both the cost side and the demand side simultaneously.

Non-residential building was already in a complicated position before the May revision. Accommodation, education, entertainment, retail and industrial sectors had all been tracking toward contraction. Interest rate uncertainty and cost pressure reinforce those trends.

Engineering construction is a partial buffer. Government infrastructure pipelines, including the Queensland Olympics program and ongoing energy transition infrastructure nationally, provide a base of committed work that does not respond to short-term cost or rate volatility in the same way private development does. Builders and civil contractors with strong positions on government infrastructure programs are better insulated than those dependent on private sector residential or commercial activity.

Residential building and non-residential commercial sectors face the sharpest pressure. Government infrastructure pipelines provide a partial buffer for builders with positions on committed programs.

The Cost Base Problem

One of the most important contextual facts in the ACIF revision is what it does not say. The contraction forecast is not a return to manageable pre-shock conditions. It is a reversal of momentum on top of a cost base that has already increased approximately 35 per cent since 2019.

Industry data published in April 2026 puts the aggregate cost increase for 2026 at 7 to 7.5 per cent across fuel, materials, wages, superannuation, insurance, interest rates and government charges. That is the operating environment builders are working within even before considering the impact of specific project risks.

The May 2025 ACIF forecast had projected construction work reaching $351 billion by 2026-27, growing at 3.1 per cent. The May 2026 revision is a significant downward movement from that trajectory. The recovery rebound that was expected has been deferred.

What Builders Should Take From This

The ACIF forecasts are a macro signal, not a sentence. They describe the operating environment, not the fate of any individual business. Construction businesses that are well-managed, financially disciplined and selective about their work mix will continue to operate successfully in a contracting market. They have done so before.

The practical implications of the ACIF revision are these. Tender volumes will likely soften through the second half of 2026. Projects that were being held for decision will be held longer. Clients who were borderline on financing will step back. The inquiry pipeline will become more competitive for the work that does proceed.

Cash flow discipline becomes more important, not less, in a market with softer volumes and elevated costs. Builders who have maintained strong payment terms, documented variations rigorously and kept their cost-to-complete estimates current are in a materially different position to those who have not.

The ACIF also notes a positive leading indicator that should not be ignored. Building approvals nationally are up 18.9 per cent. That represents future work in the pipeline. It does not resolve the 2026 contraction, but it does mean the conditions for a 2027-28 recovery are being built.

The construction industry has been through harder cycles than a 0.8 per cent contraction after solid growth. The businesses that come through well are the ones that read the environment clearly and adjust accordingly, not the ones that assume the 2025 tailwind will continue indefinitely.

General information only. This article does not constitute legal, financial or professional advice. Readers should seek independent advice relevant to their specific circumstances.

Author: TGB Editorial