Error costs seven times the industry's profit

Direct error costs UK construction about £5 billion a year

The Get It Right Initiative, an industry body formed by UK contractors, clients, designers and consultants in 2015, set out to answer exactly that. Its research put the direct, recorded cost of error at around £5 billion a year in the UK: rework orders, corrected drawings, materials bought twice.

Direct cost is only the part that makes it into a cost system. Add unrecorded process waste, latent defects and indirect costs, and GIRI's estimate rises to between 10 and 25 percent of project cost, £10–25 billion per year across the sector. The line the industry remembers comes from GIRI's founding document:

The annual spend due to error is estimated to be around 7 times the total annual profit of the UK Construction Industry.

GIRI's follow-up research narrowed the range: the true cost of error is likely closer to 21 percent of project cost, around £21 billion per year in the UK. And this is not a British peculiarity. The drivers GIRI identifies, time pressure in design, poor information and weak handoffs, are the same ones the dispute data documents across Europe and North America.

The errors surface first in the disputes

In the disputes, for one. Arcadis has named "errors and/or omissions in the contract document" the number one cause of construction disputes for three consecutive years, most recently in its 15th annual Global Construction Disputes Report from June 2025. The average dispute in North America now stands at $60.1 million, up 40 percent in a single year.

HKA's CRUX report for 2025, built on more than 2,200 projects in 114 countries, puts the sums in dispute at an average of 33.4 percent of contract budgets. A third of the contract value, argued over after the fact. In Europe, HKA finds problems with design accuracy on around 30 percent of the projects it examined. Nearly every such claim started upstream, typically as an ambiguous specification or a missing detail in the tender documents.

A new study says 0.38 percent, and both numbers are right

A fair challenge. In January 2026, Peter Love published actual cost records from a contractor's own projects in ASCE's Journal of Construction Engineering and Management: formally logged field rework averaged 0.38 percent of contract value, 0.76 percent once post-completion corrections were included. Two orders of magnitude below GIRI's range. Someone must be wrong.

Nobody is. The two numbers measure different layers of the same iceberg. Love counted rework that one contractor formally logged in its cost system. GIRI counts everything below the waterline: process waste nobody records, latent defects that surface years later, and indirect costs such as delay and disputes spread across the whole supply chain. Love's own data shows how much never gets written down: actual pre-completion rework costs were underreported by around 300 percent.

GIRI's field research explains why the full bill stays invisible: the majority of the initial cost of error lands on subcontractors two tiers down, where neither the main contractor nor the client ever sees it. The pattern matches FMI and PlanGrid's finding that 48 percent of US rework stems from poor data and miscommunication: an information problem, not a workmanship problem. What gets logged is the tip.

The one profit lever nobody prices

Construction lives on margins of a few percent. That is what makes the seven-times line more than a slogan. If the error bill really is seven times the industry's profit, then removing one seventh of it adds an amount equal to that entire profit. No other line in the business has that leverage: not materials, not wages, not financing. For the industry as a whole, error is not a quality issue but the margin issue. What lets the bill keep growing is who pays it, and it is rarely the party that could have stopped the error most cheaply. The cost travels: on to the client as a change order, down to the subcontractor who absorbs it, or into hours that get billed anyway, and it hides along the way. No single party feels the whole seven-times bill, which is exactly why a problem this large persists.

The dispute data also says where to start. The number one cause is not workmanship. It is the contract documents: the specifications, descriptions and conditions written before anyone reaches site. An error is cheapest at the moment it is written and dearest at the moment it is found. Checking thousands of pages against each other has always been work nobody could afford to do properly. That is no longer true.