What the Supreme Court tariff ruling means for engineering and construction

The Supreme Court’s recent ruling on tariffs offers little clarity for engineering and construction leaders—even as the underlying policy continues to drive historic levels of domestic investment. The court rejected tariffs levied under the International Emergency Economic Powers Act (IEEPA), opening the door to possible refunds. Within hours, President Donald Trump announced new global tariffs under a different legal authority.

These events crystallized the real problem for E&C firms, and it’s not just about tariff rates. It's about volatility. E&C firms can engineer around known costs. Even high costs are manageable. Unpredictable costs are not. Consider the challenges. 

• Bidding a lump-sum price if the tariff rate might change multiple times before you buy equipment and materials.
• Locking a guaranteed maximum price (GMP) if the legal authority underlying the tariff might get struck down mid-project.
• Filing for regulatory cost recovery if tariffs might be refunded next quarter.
• Building a supply chain around sourcing assumptions that shift with the political winds.

Ultimately, you can’t negotiate a fair contract if neither party can quantify the risk they’re allocating. Arguably, contractual gray zones are the most dangerous part. Who pays when tariffs shift mid-project? Who captures refunds when tariffs are struck down retroactively? Ambiguity bleeds margin.

The growth opportunity, however, remains vast. US construction stands to capture a significant share of the roughly $5 trillion in projected global construction growth over the next five years, fueled in part by the domestic investment tariff policy is designed to accelerate. Still, in recent interviews with dozens of senior decision-makers at leading E&C firms, we’ve heard most predicting that tariff volatility would immediately disrupt US project economics, potentially driving unbalanced results across a project’s life cycle. Companies are trying to source more materials domestically, but the infrastructure to manufacture components at competitive prices does not yet exist at scale and will take years to build. Costs have risen sharply, and many companies can’t pass those increases on to customers without making projects unviable. 

This is happening at the same time as demand for infrastructure—particularly data centers—is surging. US E&C firms are redirecting capital and talent to meet this boom, but leaders worry about overcommitting to a single sector, weakening their ability to pivot. Tariff volatility amplifies this risk.

As an E&C leader, you can't afford to wait for certainty—the opportunity won’t. Here are four immediate imperatives.

Ride the reshoring wave. Don't drown in it.

Tariff volatility is the most powerful reshoring accelerator since the pandemic. Manufacturers are moving production onshore because they can no longer forecast costs with confidence. That’s the policy’s intent, and the good news is that every new domestic facility is an E&C opportunity.

Here’s the trap. Reshoring projects move fast, and owners push for lump-sum commitment before designs or sourcing strategies are mature. A contractor who locks price today on materials needed in six months is at a disadvantage, since it’s impossible to predict tariff fluctuation. The Supreme Court ruling further complicates matters. If tariffs already paid are later refunded, who gets the money? The contractor who paid the duty, the owner who reimbursed it, or the ratepayer who funded it through a regulatory surcharge? Most contracts do not contemplate today’s volatility. Pursue reshoring aggressively and structure deals to share the upside and the uncertainty. Don’t lock pricing before supply chains are defined.  

Build commercial models, supply chains, and contracts for permanent uncertainty.

The math is unforgiving. On a $500 million project, imported materials can represent 30% to 50% of the cost. A tariff swing of 10% to 25% translates to $15 million to $60 million in cost movement, enough to vaporize contractor margin. Unlike commodity fluctuation, which can be hedged, tariff volatility is political and can come without warning.  

Lump-sum pricing in this environment can be reckless for both parties, since neither can predict trade policy risk. E&C firms need commercial frameworks purpose-built for volatility, such as:

• Dynamic tariff adjustment clauses: Standalone, bilateral, and triggered by rate thresholds in either direction as well as changes in the legal authority underlying tariffs.
• Change-in-trade-policy triggers: Explicit rights when tariff actions materially alter project economics, covering increases, exemptions, retaliations, reversals, and judicial invalidation.
• Refund allocation provisions: Clarity around who captures the benefit if tariffs are later refunded.
• Sourcing transparency: Whichever party directs imported equipment owns the risk.
• Convertible structures: Open-book until scope, sourcing, and tariff exposure are known.
• Portfolio-level tariff risk modeling: Across the backlog, not project-by-project.

Leading firms are building AI-powered digital supply chain control towers for real-time, scenario-based tariff exposure modeling. PwC research shows digital champions achieve significant supply chain cost savings, an advantage that may be existential when every procurement decision is a bet on future policy.

The winners will price tariff volatility explicitly. Walking away from mispriced risk isn’t weakness. It’s discipline that protects both margin and reputation.

Prove your work to solve key customers’ regulatory problems.

For regulated utilities and public power authorities, tariffs don’t just raise costs. They trigger processes for recovering those costs through regulatory mechanisms that vary by state, by commission, and by rate structure. E&Cs can position themselves to win by helping their customers prepare for these evolving scenarios.

The Supreme Court ruling on tariffs raises a new key question for their customers. What happens when tariff costs already recovered from ratepayers are potentially refundable? The complexity was already staggering. If lower courts determine that importers are entitled to refunds on IEEPA tariffs—potentially $170 billion across all tariffs—every utility that passed those costs through to ratepayers faces a cascading set of questions. Are they obligated to return recovered tariff costs? Do regulatory commissions claw back surcharges already collected? What’s the timeline? Who carries the interim cash-flow exposure?  

The E&C firms that help their customers handle cost recovery and potential refund liability will be indispensable. E&C firms positioned to win will build:

• Tariff cost segregation, line-item traceability from the tariff’s legal underpinnings to invoice impact, preserving evidence for both recovery filings and potential refunds.
• Mitigation evidence trails, contemporaneous records of alternative sourcing, domestic options pursued, procurement timing optimized, built to survive prudency review and refund adjudication.
• Regulatory-ready deliverables, formatted for specific jurisdictions, now with refund scenario modeling.
• Real-time compliance integration, with tariff tracking embedded in project controls as procurement happens, not reconstructed when the filings or claims are due.

The differentiator isn’t building the project at the right cost. It’s arming the customer to prove the cost was right, recover what’s owed, and manage refund exposure if the legal ground shifts.

Build the workforce that doesn’t exist yet.

Today’s environment demands E&C project directors who can read tariff schedules and Supreme Court opinions. Estimators who can bid scenarios across multiple legal authorities. Commercial leads who negotiate dynamic clauses covering tariff fluctuation, legal authority changes, and refund allocation. Legal teams fluent in trade law, administrative law, and utility regulation. That talent barely exists today, but the firms that create it will occupy a unique competitive space.

Meanwhile, the structural workforce crisis grinds on. The pipeline of new recruits is insufficient to replace retirees and talent poached by the tech sector. Construction labor productivity has been flat to declining for over three decades, despite transformative gains driven by technology in other sectors. E&C remains one of the least digitized major industries globally. Tariff-driven reshoring will only intensify demand on a faltering workforce model.

As a result, modular construction and prefabrication will become critical. Controlling fabrication location and timing manages tariff exposure at the component level, locks costs earlier, and shrinks vulnerability. Firms that combine productivity technology with tariff-aware procurement will hold a structural advantage.

The firms that win build in uncertainty. They don’t dance around it.

Tariff volatility has fundamentally changed the risk calculus of the E&C business. The winners will treat trade policy risk with the same rigor as safety, crafting dynamic tariff mechanisms in supply chains as well as contracts and controls that flex as policy demands. They will price unpredictability honestly, invest in domestic capability, and collaborate with customers on complex regulatory matters and tariff refunds.

Ultimately, the firms that will win will combine technical excellence with commercial sophistication to operate in a world where the rules keep changing. The policy direction is clear, and the domestic opportunity is historic. Learning to build in uncertainty, rather than pretending it away, will define the next era for E&C leaders.