Britain’s Four-Day Workweek Trial: A Win for Workers’ Wellbeing
In Britain’s largest-ever experiment with a four-day workweek, an impressive 71 percent of employees reported feeling less burnt out by the trial’s end. This striking figure, reflecting improved wellbeing rather than profit or productivity, offers fresh insight into the true impact of condensed work schedules. While many anticipated how a shorter week might affect output, the profound effects on employees’ mental and physical health came as a genuine surprise.
As writers and editors reviewing this research, we are not psychologists, clinicians, or workplace-health specialists. Our analysis is based on one significant pilot study and should not be taken as personalized advice. The findings rely on self-reported data from companies that volunteered, so while the patterns are notable, they are not prescriptive for every individual or organization.
The Trial: What 61 Companies Actually Agreed To
Between June and December 2022, 61 companies and approximately 2,900 employees participated in a pioneering trial where they transitioned to a four-day workweek without any reduction in pay. The agreement was straightforward: workers would receive 100 percent of their salary for 80 percent of their usual hours, with the expectation of maintaining 100 percent of their output.
Organized by the campaign group 4 Day Week Global alongside the think tank Autonomy, the trial was rigorously studied by researchers from prestigious institutions including Cambridge University, Boston College, University College Dublin, the University of Brussels, and the University of Salford.
Notably, there was no one-size-fits-all approach. Some firms opted to close on Fridays, while others staggered days off across teams to maintain continuous operations. Crucially, all participating companies had volunteered, indicating a pre-existing openness to exploring new work models—an important factor in interpreting the outcomes.
Output Held Steady — As Expected
Financial and productivity metrics largely held up under the new schedule. Firms that provided revenue data recorded a slight average increase of 1.4 percent in takings over the trial period, according to Cambridge University’s report. This stability in output, despite a 20 percent reduction in hours worked, was the trial’s central hypothesis.
Why did productivity not decline? Brendan Burchell, who led the Cambridge research, explained that workers became “much less inclined to kill time” and actively adopted technologies that boosted efficiency. Meetings were trimmed, distractions minimized, and the work naturally condensed into the four remaining days. This focused approach meant that, rather than stretching work thinly over five days, employees concentrated their efforts more effectively.
Burchell summarized the findings plainly: “Before the trial, many questioned whether we would see an increase in productivity to offset the reduction in working time, but this is exactly what we found.” It’s important to note this was a volunteer pilot without a control group, so while promising, it’s not definitive proof that a shorter week universally boosts output. However, within this trial, fears of productivity loss largely dissipated.
The Real Surprise: How People Felt
The standout results were about employee wellbeing. Besides the 71 percent reporting lower burnout levels, 39 percent said they felt less stressed. Sick days plunged by 65 percent, and employee turnover fell by 57 percent. Cambridge researcher Niamh Bridson Hubbard shared that “it was common for employees to describe a significant reduction in stress. Many described being able to switch off or breathe more easily at home.”
Anyone who has ever spent the first day of a traditional weekend just recovering from the workweek will understand the value of an extra day off. The additional time allowed employees to rest more fully and return refreshed, which may explain the dramatic shifts in wellbeing.
However, some caution is warranted. Michael Leiter, an organizational psychologist not involved in the study, noted that the trial measured burnout in a colloquial sense—feeling tired or frustrated at work—rather than through strict clinical criteria. Leiter acknowledged that a four-day week probably reduces burnout by clinical standards too, but emphasized the distinction matters: the 71 percent figure reflects how employees described their feelings, not a medical diagnosis.
Time is another important caveat. As Scientific American reported, the six-month trial was relatively brief, so it remains uncertain whether these wellbeing improvements will endure long-term. Juliet Schor, a co-author of the report, noted that wellbeing “improved in the first three months, and that improvement was maintained” through months three to six, with no regression detected during the trial period. The sustained effect beyond six months, however, remains unknown.
Why 89 Percent of Firms Continued the Four-Day Week
A powerful indication that the four-day week was more than just a temporary novelty came at the trial’s conclusion. Of the 61 participating firms, 56—around 92 percent—opted to keep the shorter workweek. A follow-up in February 2024 found that 54 companies were still operating under the four-day model a full year later, with 31 having made it permanent, according to CNBC.
If a company quietly reverts to five days after a trial, it suggests the trade-off didn’t work for them. Yet, nearly nine in ten chose to continue, signaling strong endorsement. David Frayne, a Cambridge research associate involved in the study, expressed optimism: “We feel really encouraged by the results, which showed the many ways companies were turning the four-day week from a dream into realistic policy.” While he is understandably invested in the study’s success, the retention figure remains undeniably compelling.
Further underscoring this shift, 15 percent of employees stated that no amount of money would entice them back to a five-day week.
However, the trial’s scope also highlights key limitations. The participating firms were volunteers, predominantly engaged in office or knowledge work with flexible hours—settings where a four-day week is more feasible. Whether these positive outcomes would replicate in more rigid environments like hospital wards, warehouses, or shift-based call centers remains an open question. Larger, more diverse trials will be essential to understanding the broader applicability of this model.
If you find your work pace becoming unsustainable, consulting a qualified counsellor or occupational-health professional is advisable, regardless of your employer’s working schedule.
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