The 4-Day Work Week: Results From UK Pilot Programs

The concept of a four-day work week has moved from a utopian daydream to a concrete business strategy. Following a massive six-month trial in the United Kingdom, researchers and business leaders now have hard data regarding how a shorter schedule impacts the bottom line. The results suggest that reducing hours does not necessarily mean reducing output.

The UK Trial: By the Numbers

The trial, organized by the non-profit advocacy group 4 Day Week Global in partnership with researchers from Cambridge University and Boston College, took place between June and December 2022. It stands as one of the world’s largest pilots of its kind.

The study involved 61 companies and approximately 2,900 employees across diverse industries. These organizations adopted the “100-80-100” model. This specific framework is critical to understanding the success of the pilot:

• 100% Pay: Employees received their full salary.
• 80% Time: Working hours were reduced to roughly 32 hours per week.
• 100% Productivity: Employees agreed to maintain their standard output.

Revenue and Productivity Findings

The most surprising data point for skeptics was the financial performance of participating firms. The companies did not lose money. In fact, they generally made more.

• Revenue Stability: Across the trial period, company revenue remained broadly the same, showing a marginal increase of 1.4% on average.
• Year-over-Year Growth: When compared to a similar period from previous years, revenue rose by an average of 35% for the participating companies.

These numbers suggest that the “burnout tax”—the cost of tired, distracted, or sick employees—is higher than many executives realize. By removing one day of work, companies saw efficiency gains that compensated for the lost hours.

Impact on Employee Retention and Health

While revenue is the primary concern for shareholders, the human impact drives recruitment and retention. The UK pilot provided distinct figures on how a three-day weekend changes workforce dynamics.

Staff Turnover: The number of staff leaving participating companies dropped by 57%. In a tight labor market, this represents a significant cost saving. Recruitment fees, onboarding costs, and the loss of institutional knowledge are expensive. By retaining staff through better work-life balance, companies offset the logistical costs of the schedule change.

Sick Days: Absenteeism plummeted. Employees took 65% fewer sick days during the trial compared to the period before. This indicates that employees used their designated “off day” to handle medical appointments, rest, and recover, rather than calling out of work unexpectedly.

Burnout and Stress: Researchers reported that 71% of employees felt less burned out by the end of the trial. Furthermore, 39% reported being less stressed. This improvement in mental health directly correlates to the sustained productivity levels mentioned earlier.

Case Studies: Who Did It Work For?

General statistics are useful, but looking at specific companies helps explain how this works in practice. The trial included marketing agencies, financial firms, and even physical industries like construction and manufacturing.

Tyler Grange (Environmental Consultancy)

Tyler Grange, an environmental consultancy firm, made the four-day week permanent immediately after the trial. They reported that on their previous five-day schedule, employees were often exhausted by Friday afternoon, leading to low output.

By switching to a four-day model, they found that meetings were shortened or cancelled, and “admin bloat” was reduced. Simon Ursell, the managing director, noted that happiness levels among staff increased by 22%. Because the team was more rested, they achieved more in four days than they previously did in five.

Rivelin Robotics

Implementing a shorter week in a manufacturing or engineering setting is more complex than in an office job. Rivelin Robotics, a Sheffield-based company, participated in the trial. They could not simply shut down operations on Fridays due to customer demands and machine run-times.

Instead, they adopted a staggered schedule. Different team members took different days off. This ensured that the facility remained operational five days a week (and potentially longer), while individual staff members still worked only 80% of the time. This highlights that the “4-day week” is often a scheduling puzzle rather than a simple three-day weekend for everyone.

Citizens Advice Gateshead

This non-profit organization faced the challenge of high demand for their services during a cost-of-living crisis. They managed the transition by meticulously tracking output targets. The leadership found that despite the reduction in hours, the team met their targets for client support. The improved morale helped staff cope with the emotionally taxing nature of social work.

Challenges and the "Intensity" Factor

It is important to note that the transition was not seamless for everyone. Of the 61 companies, about 56 decided to continue the trial, and 18 made it permanent immediately. However, a small number paused or stopped the initiative.

The main drawback reported was work intensification. Because employees had to achieve 100% of their output in 80% of the time, some workdays became more stressful. There was less time for “water cooler” chat or a relaxed coffee break. The pressure to perform during the four active days was higher.

Additionally, some managers struggled with scheduling. If a client needed something on a Friday and the primary contact was off, it created friction. Companies had to invest heavily in handover protocols and shared documentation to ensure no tasks were dropped on the “off” days.

The Long-Term Outlook

The UK pilot results align with similar trials conducted in Iceland, Spain, and by Microsoft in Japan. The consensus is shifting. The data indicates that the five-day, 40-hour work week—a relic of the industrial revolution established by Henry Ford in 1926—may no longer be the most efficient way to run a digital economy.

With 92% of the participating UK companies opting to continue with the shorter week, the business case is becoming difficult to ignore. The focus has shifted from “Can we afford to do this?” to “Can we afford the turnover and burnout if we don’t?”

Frequently Asked Questions

Did employees work 10-hour days to make up the time? No. The vast majority of companies in the UK pilot reduced total working hours to approximately 32 hours per week. This is distinct from a “compressed” schedule where staff work four 10-hour days.

Did salaries decrease? No. The core requirement of the 4 Day Week Global pilot was that pay must remain at 100%. If pay is cut, it is considered part-time work, not a four-day work week strategy.

What industries participated? The pilot was diverse. It included financial services, marketing, IT, construction, manufacturing, healthcare, and retail. While office-based roles found it easier to implement, physical industries also found success through staggered shifts.

Is the four-day week legally required in the UK? No. Currently, the government has not legislated a four-day week. It remains a voluntary benefit chosen by individual private companies to improve retention and productivity. However, the Labour government has discussed strengthening rights to request flexible working arrangements.