This summer marks 30 years since its inception. That anniversary prompts a fundamental question: does the Act’s core concept of “construction operations” still reflect how buildings are actually built?

The rise of modern methods of construction

The construction industry has transformed since 1996. Today, it relies heavily on Modern Methods of Construction (MMC)—off site manufacturing, modular components, computer aided design, and advanced robotics. When implemented effectively, MMC promises significant gains in efficiency and profitability. In 2018, the House of Lords Science and Technology Committee endorsed this shift, concluding that “clear and tangible benefits from off site manufacture … make a compelling case for its widespread use,” and noting the Government’s “presumption in favour” of off site manufacture.

However, this technological progress creates a legal problem. The Construction Act only protects parties whose contracts involve “construction operations.” Work falling outside this definition receives none of the Act’s benefits—no implied payment terms and no right to adjudication.

A definition shaped by lobbying, not logic

The Act’s definition of “construction operations” is far from intuitive. It reflects an eclectic mix of exclusions shaped by industry lobbying in the 1990s: contracts with residential occupiers, oil and gas extraction, art installations, and the installation of plant or machinery on power generation or water treatment sites. Alongside these carve outs sit seemingly random inclusions, such as painting and decorating (provided it is not art), and advice on landscaping where it relates to construction operations.

This patchwork creates real commercial uncertainty. Parties cannot always predict whether the Act’s protections will apply to their contracts.

Where manufacturing ends and construction begins

MMC compounds this uncertainty by blurring the boundary between manufacturing and construction. The Act expressly excludes “manufacture or delivery to site of building or engineering components or equipment and materials, plant or machinery, except under a contract which also provides for their installation.”

The practical consequence is significant. If an MMC supplier only manufactures components off site, its contracts fall outside the Construction Act. But if that same supplier also installs those components on site, its contracts are protected.

The case of Cubex (UK) Ltd v Balfour Beatty Group Ltd [2021] EWHC 3445 (TCC) illustrates the stakes. Cubex designed and supplied doors for Balfour Beatty’s fit out of the new Woolwich station on London’s Elizabeth Line. When Balfour Beatty failed to pay, Cubex obtained an adjudicator’s award exceeding £400,000.

The victory proved illusory. When Cubex sought to enforce the award, Balfour Beatty successfully argued that the Construction Act did not apply because Cubex had only supplied—not installed—the doors. The adjudicator lacked jurisdiction, the award was unenforceable, and Cubex faced starting again with costly and protracted court litigation.

This outcome is difficult to justify. Had Cubex’s contract included installation, the Act would plainly have applied. The distinction turns not on the nature or value of the work, but on a contractual technicality.

Emerging pressure points

The “construction operations” definition faces pressure from other directions as well. The spread of smart buildings and building integrated energy systems—rooftop solar panels, battery storage, heat pumps—raises fresh questions about the “power generation” exclusion. That exclusion was drafted with large, standalone facilities in mind. Its application to smaller installations embedded within buildings is unclear.

The case for reform

The Construction Act’s definition of “construction operations” provided a workable framework for its era, but that era has passed. The industry has evolved; the statute has not.

If Parliament wants adjudication rights and payment protections to reflect how construction is actually delivered today, it must revisit the statutory language. The current definition, shaped by 1990s lobbying and drafted before MMC became mainstream, no longer provides the clarity the industry needs.

Until reform arrives, parties face a difficult landscape. The Act is technical and prescriptive, with serious consequences for non compliance. Uncertainty about whether it applies at all only compounds the risk. Parties whose contracts involve work straddling the boundary between included and excluded operations should navigate existing case law carefully—and seek legal advice early.