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What the latest energy shock means for UK construction

The UK construction industry is facing a renewed wave of cost pressure. Not the slow, predictable kind that gets priced into next quarter's tenders. The kind that moves faster than most businesses can plan for.

In March 2026, the monthly average for Brent crude rose from $70.89 in February to $103.13, a 45% increase in a single month.¹ UK diesel pump prices moved sharply in the same period, rising from 142.15 pence per litre in early March to 176.52 pence per litre by the end of the month.² For an industry that runs on diesel, from haulage to plant to temporary power, that's not a headline. That's a line item that changed in weeks.

This post breaks down what's happening, where it's showing up, and what it means if you're managing credit, procurement, or supply chain risk in construction right now.

What's Behind It

The conflict in the Middle East and ongoing disruption around the Strait of Hormuz have created two compounding pressures: energy prices are rising sharply, and global shipping routes are being rerouted or delayed.

UNCTAD's March 2026 report describes the Strait of Hormuz as "one of the world's most critical maritime chokepoints," carrying around a quarter of global seaborne oil trade along with significant LNG volumes. The report notes that disruptions there affect energy markets, maritime transport, and supply chains.³

Even when ceasefire headlines offer hope, the operational reality moves slower. Reuters reported in April 2026 that Maersk remains cautious on Hormuz transit opportunities, with surcharges and rerouting tending to persist beyond the immediate news cycle.⁴ The IMO's Secretary-General has also issued a statement emphasising seafarer safety and the importance of safe navigation in the strait.⁵

For construction, the implication is straightforward: the energy and freight cost environment has shifted — and it hasn't settled yet.

How This Reaches Construction Businesses

The path from an energy shock to a construction cost problem is well understood, but worth spelling out because it moves through the supply chain in layers.

Higher crude prices push up diesel.¹⁰ ¹¹ Diesel affects haulage, plant hire, and on-site power. At the same time, longer or rerouted shipping lanes mean higher freight charges and extended lead times for imported materials.³ These costs often reach contractors and suppliers before the official indices reflect them.

The UK's Construction Material Price Index (the DBT "All Work" measure) has been relatively stable through most of 2025 and into early 2026, sitting at 157.3 in February.⁶ But composite indices average across many material categories and take time to update. They can give a reassuring picture while the reality on site is already shifting.

The Construction Leadership Council's Material Supply Chain Group acknowledged this directly in their March 30, 2026 statement, flagging tightening supply conditions and risk signals reaching contractors and clients.⁷

Reuters reported on April 8 that UK construction firms recorded an unusually large jump in cost inflation pressure in the March 2026 PMI reading, with firms pointing to energy costs and supply chain disruption as key drivers.⁸

Different Materials, Different Stories

One of the most important things to understand right now is that this isn't a uniform price surge across every material.

Looking at the DBT's producer price indices through February 2026:⁶

Structural steel has actually eased over the past year, from an index of 151.0 in April 2025 to around 139 by early 2026.⁶ The UK Government published its Steel Strategy in March 2026, addressing capacity and resilience, but steel isn't where the immediate pressure sits.⁹

Cement has been broadly flat, moving between 139 and 146 over twelve months with no dramatic swings.⁶

Timber (imported sawn wood) tells a different story, rising from 170.7 in November 2025 to 176.9 by February 2026 [6]. As an import-dependent material, timber is more directly exposed to shipping route disruption and freight cost increases.³

The pattern matters: this is a fuel and freight shock first, an imported materials pressure second, and a composite index story only later. Understanding that sequence is important for anyone making credit or procurement decisions because the headline indices can lag the reality by months.

What This Means in Practice

For contractors, the immediate pressure sits in plant, haulage, temporary power, and imported components with long lead times. Under fixed-price arrangements, these shifts can quietly compress margins. Balfour Beatty's FY2025 reporting highlights the role of early subcontracting and supply chain protections in managing this kind of exposure.¹⁰ Kier's HY2026 interim results flag "project inflation" as a downside scenario and reference target cost and cost-plus structures as a way to share risk more fairly.¹¹

For clients, budget assumptions made even a few months ago may need revisiting. In public-sector contexts, this can mean re-phasing or value engineering. In private-sector work, the link between energy prices, inflation expectations, and interest rates adds another layer of uncertainty to investment decisions.¹²

For suppliers extending trade credit, this is where the picture becomes most complex. When contractors absorb cost shocks on fixed-price work, their cash flow position can change faster than traditional credit assessments reflect. A score or report from three months ago doesn't account for the energy price environment we're in now. This isn't about blame, it's about making sure your risk picture is as current as the market conditions your customers are operating in.

Steps Worth Considering

Align price adjustment mechanisms to the right indices. If your contracts include fluctuation clauses, make sure the indices match the actual cost drivers, fuel, specific materials, rather than relying solely on a broad composite. RICS's guidance on fluctuation clauses¹³ and the MoD's RAPA framework¹⁴ are practical references worth looking at.

Bring forward procurement where you can. Where feasible, issue early subcontracts, secure capacity, and reduce exposure to spot pricing. This mirrors the approach that the UK's largest contractors describe in their own risk management ¹⁰ ¹¹

Treat freight and logistics as a visible cost line. Rather than absorbing freight risk into general overhead, use explicit line items, agreed surcharge mechanisms, and realistic contingencies.³ This protects both parties in a volatile environment.

Pay close attention to payment behaviour and cash flow signals. In times of cost volatility, working capital pressure and payment performance can shift quickly. Healthy supply chain relationships depend on visibility — understanding what's happening now, not just what happened last quarter.³

The Wider Context

The Bank of England's February 2026 Monetary Policy Report discusses continuing uncertainty around the outlook for energy prices and how this feeds into inflation projections.¹² The ECB's Economic Bulletin (March 2026) explicitly connects geopolitical risk to oil and gas price movements.¹⁵ This is a global story, but the UK construction sector, with its reliance on imported materials and energy-intensive operations, feels it acutely.

None of this is cause for panic. The UK construction industry has navigated cost shocks before and will navigate this one. But navigating it well means having the right information at the right time and making sure the tools you rely on for credit and procurement decisions are keeping pace with what's actually happening in the market.

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