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Sources · A four-day week

This house would move to a four-day working week.

Fact bank v1 · 12 cards

  1. FDW-01Mostly true

    “The biggest study of the four-day week found it cut burnout and made workers healthier and happier.”

    Mostly right. A 2025 study of 2,896 staff at 141 organisations in six countries, including the UK, found less burnout, more job satisfaction and better mental and physical health after a six-month trial of a four-day week with no cut in pay. Staff at 12 comparison companies did not see the same change.

    People whose own hours were cut the most saw the biggest gains. The study, published in Nature Human Behaviour, used trials run by 4 Day Week Global, a non-profit group. Its results come from staff answering surveys about themselves, and the comparison group was small: 285 staff whose hours did not change. It shows what happened over six months in organisations that took part, not what would happen if every employer had to do it (see FDW-08).

    “141 organizations in Australia, Canada, Ireland, New Zealand, the UK and the USA shows improvements in burnout, job satisfaction, mental health and physical health”
    Nature Human Behaviour·Work time reduction via a 4-day workweek finds improvements in workers' well-being (Nature Human Behaviour)Peer-reviewed research · 21 Jul 2025 ↗

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  2. FDW-02Mostly true

    “Almost every company that tried the four-day week in the big trials decided to keep it.”

    Mostly right for the firms that took part. In the UK's 2022 trial, 56 of the 61 companies (92%) carried on with a four-day week afterwards, 18 of them permanently. Across 170 firms in six-month trials of a 32-hour, four-day week with no cut in pay in 2022 and 2023, 90% carried on.

    Staff in the UK trial worked an average of 34 hours over four days on the same pay. The firms' revenue stayed stable and staff turnover fell by 57%. These figures come from reports by the researchers and 4 Day Week Global, the group that ran the trials, rather than from academic journals. Two thirds of the UK firms had 25 or fewer staff, and a survey of employers at the time found very few others expected to move to a four-day week. Other research has found that some organisations went back to a standard week soon after their trial ended (see FDW-08).

    “Of those, 56 companies, or 92%, opted to continue like that, 18 of them permanently.”
    Reuters·Four-day week liked by UK employers in world's largest trialFact-checker / wire service · 21 Feb 2023 ↗

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  3. FDW-03Mostly false

    “When a council in England tried a four-day week, its services got worse.”

    Mostly not. An independent report by three universities found 21 of the 24 services that South Cambridgeshire District Council tracked improved or stayed the same after it moved to a four-day week in 2023. Six got clearly better, including answering calls and deciding planning applications on time.

    Three of the 24 measures did not hold up. Residents' and businesses' satisfaction also fell by a clear margin in a number of areas, though the council's performance figures did not show the same drop, and satisfaction with councils has been falling across the country. Staff work about 32 hours over four days for full pay, and the offices still open five days a week. The council says the change saves about £399,000 a year, shared with its partner Cambridge City Council, mainly by filling jobs with permanent staff instead of agency workers. In 2023 the then government issued a formal warning, with the minister objecting to the council 'offering full time pay for part time work'. That warning lapsed in November 2024, and the council made the four-day week permanent in July 2025. Statutory government guidance for councils, published in May 2024, lists 'part-time work for full-time pay without compelling justification' as a possible sign of failure. This is one council, and the findings were published by the council itself.

    “21 of 24 services have improved or stayed the same since four-day week working began at the Council in 2023”
    South Cambridgeshire District Council·Four-day working weekGovernment / parliament · 4 Jul 2025 ↗

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  4. FDW-04Mostly false

    “Iceland switched to a four-day week, and now 86% of workers there have one.”

    Not quite. Iceland's big trials, from 2015 to 2019, cut the working week to 35 or 36 hours with no cut in pay, which is four or five hours less, not a whole day off. Afterwards, collective agreements between unions and employers gave 86% of Iceland's workforce a shorter week or the right to shorten their hours.

    The trials started from a 40-hour week and at their peak covered more than 1% of Iceland's working population, in places like playschools, care homes, government departments and a police department. Most of the data suggested services stayed at the same level, and workers reported less stress. Iceland had some of the longest working hours in the OECD, so it started from a different place. In the UK's 2022 trial, by comparison, staff worked four days and an average of 34 hours a week.

    “gave 86 per cent of the Icelandic workforce a reduced workweek or the right to shorten their hours”
    International Labour Organization·Working Time and Work-Life Balance Around the World (Box 8: Icelandic reduced workweek pilot)Intergovernmental body · 6 Jan 2023 ↗

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  5. FDW-05Mixed

    “Countries that work fewer hours, like Germany, are more productive, so working less makes us more productive.”

    Partly. Richer countries such as Germany and Switzerland do work fewer hours and produce much more per hour. But that is mainly because workers who produce more each hour earn more and can afford to work less, so it doesn't prove that cutting hours makes a country more productive.

    There is some evidence the link runs both ways: a study of munitions workers in wartime Britain found output per hour held up to a point, then fell sharply when hours got very long. The International Labour Organization says longer hours are generally linked with lower productivity per hour, and shorter hours with higher. But workers in the US and Singapore work many more hours than people in countries with similar productivity, so hours are not the whole story. A country only keeps the same total output on fewer hours if each hour becomes productive enough to make up the difference.

    “in richer countries workers are able to produce more with each hour of work, which translates into higher incomes and the ability to work less.”
    Our World in Data·Do workers in richer countries work longer hours?Independent research institute · 21 Dec 2020 ↗

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  6. FDW-06Mostly false

    “A four-day week would create jobs, because the work would be shared out among more people.”

    Past cuts to the working week don't back this up. When France cut its standard week from 39 to 35 hours, starting with big firms in 2000, a study by two IMF economists found no clear change in the total number of people in work, and fewer jobs among the people the law directly covered.

    In that study, some workers took second jobs or moved to smaller firms, and some were replaced by cheaper workers who had been out of work. In West Germany, where unions cut standard hours industry by industry from 1985, a study found jobs rose only slightly, by 0.3 to 0.7% for each hour cut, while total hours worked fell by 2 to 3%, though workers as a group earned more in total. Results for the early 1990s were less hopeful. Cutting hours for a while to avoid lay-offs in a slump, as Germany's Kurzarbeit scheme did during Covid, is different: there, shorter hours did help keep people in jobs.

    “Employment of persons directly affected by the law declined, although the net effect on aggregate employment was not significant.”
    International Monetary Fund·Are the French Happy with the 35-Hour Workweek? (IMF Working Paper 06/251)Intergovernmental body · 1 Nov 2006 ↗

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  7. FDW-07True

    “Working long hours kills hundreds of thousands of people a year.”

    Confirmed: the World Health Organization and the International Labour Organization estimate that working 55 hours or more a week led to 745,000 deaths from stroke and heart disease worldwide in 2016.

    Working 55 hours or more was linked to a 35% higher risk of stroke and a 17% higher risk of dying from heart disease, compared with working 35 to 40 hours a week. So it shows the harm of very long weeks. It does not show that cutting a normal 35 to 40 hour week down to four days would save lives. Most of the deaths were among men (72%), and most were people aged 60 to 79 who had worked long hours in middle age. About 9% of the world's population work these long hours.

    “Long working hours led to 745 000 deaths from stroke and ischemic heart disease in 2016, a 29 per cent increase since 2000”
    World Health Organization·Long working hours increasing deaths from heart disease and stroke: WHO, ILOIntergovernmental body · 17 May 2021 ↗

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  8. FDW-08Mostly true

    “The four-day week trials are too rosy, because they rely on staff surveys at organisations that wanted it to work.”

    Largely a fair warning. Researchers point out that many four-day week trials share the same weak spots: they lean on what staff say about themselves, the samples are often small and unrepresentative, comparison groups are weak, and people who like the idea may report what they hope to see.

    In the largest study, 2,896 staff on shorter weeks were compared with just 285 staff whose hours did not change, and two thirds of the firms in the UK trial had 25 or fewer staff. That doesn't show the results are wrong, and not all the evidence is self-reported: South Cambridgeshire council's results came from its own performance figures, such as calls answered and planning decisions, analysed by university researchers, and firms in the UK trial reported stable revenue. A new trial at the University of Sussex is adding blood tests, sleep watches and brain scans to get past these problems.

    “Despite interesting wellbeing results from previous working time reduction trials, many share key methodological limitations.”
    Frontiers in Psychology (open-access article on PubMed Central)·Assessing health, wellbeing, and working life impacts of a 4-day week: a multimodal protocol (Frontiers in Psychology)Government / parliament · 17 Aug 2026 ↗

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  9. FDW-09Mixed

    “A four-day week just means cramming five days' hours into four long days, which wears people out.”

    It depends which kind. A 'compressed' week keeps the same hours over four longer days, and the evidence on its health effects is mixed: some studies found more tiredness and stress, others found health benefits. But the four-day weeks in the big recent trials cut hours too, usually to about 32 a week, with no cut in pay.

    An International Labour Organization review found compressed weeks generally help work-life balance, and concluded that on the whole they are good for workers, while noting that some studies linked the longer days to fatigue and aches and pains. Some real schemes are compressed: Belgium lets workers do 38 hours over four days of 9.5 hours, and some UK civil service departments offer compressed hours on the same pay. In the UK's 2022 trial, staff averaged 34 hours over four days. So it matters which version the motion means.

    “there is a lack of consensus concerning the physiological and psychological health effects of compressed workweeks”
    International Labour Organization·Working Time and Work-Life Balance Around the World (section 3.5: Compressed workweeks)Intergovernmental body · 6 Jan 2023 ↗

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  10. FDW-10Mostly true

    “A four-day week can't work in hospitals, care homes and shops without hiring lots more staff.”

    Largely right. Researchers say jobs where someone has to be there all the time, like hospitals, care homes, shops, security and production lines, face real obstacles, and cutting hours there may mean paying for extra staff or overtime.

    Office teams can often keep output up by cutting meetings and admin, but a 2026 review of healthcare trials says hands-on care may not be able to absorb shorter hours through efficiency alone. In a Swedish elder-care trial of six-hour days, extra staff were needed and costs went up, though staff health and the quality of care improved. A nursing pilot at a hospital in Seoul cut staff turnover, but staffing, funding and cover were the main barriers to doing it more widely. Researchers writing in Nature Human Behaviour warn that output could fall if the gains seen in offices don't carry over to every sector. Some frontline services have managed it: South Cambridgeshire's shared bin service collected over 99% of household bins on time during its trial. In the US, working full-time over four days is already more common among police, firefighters and health-care workers, but that is full-time hours worked in four days, not a shorter week.

    “occupations where physical presence is required at all times (e.g., restaurants and retail stores, hospitals, security guards, aged care workers and production lines)”
    Humanities and Social Sciences Communications (Nature Portfolio)·The four-day workweek in Australia: insights from early adopters of the 100:80:100 model (Humanities and Social Sciences Communications)Peer-reviewed research · 13 May 2026 ↗

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  11. FDW-11Mostly false

    “Squeezing the work into four days just makes people more stressed and burnt out.”

    Mostly not, on the evidence so far. Work can get more intense, but in the largest study, of 2,896 staff at 141 organisations, burnout fell and mental and physical health improved after six months on a four-day week with no cut in pay.

    South Cambridgeshire council, which adopted a four-day week, says plainly that the work 'is more intense', and a study of 45 staff in a New Zealand trial found more pressure to perform and more checking up by managers. But in interviews with leaders at 15 Australian firms, the leaders said staff did not need to get 25% more done each hour, partly because the firms cut out pointless tasks. The big study used staff surveys and lasted six months, so longer-term effects are less certain (see FDW-08).

    “Compressing five days of work into four can create stress, but the benefits outweigh the downsides, sprawling study shows.”
    Nature·Biggest trial of four-day work week finds workers are happier and feel just as productive (Nature news)Peer-reviewed research · 21 Jul 2025 ↗

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  12. FDW-12False

    “The government is bringing in a four-day, 32-hour week for everyone.”

    No. In February 2025 the government said it had no plans to make employers give a four-day week for five days' pay, and in April 2026 it said a four-day week on full pay was not being considered for civil servants. Viral videos in 2025 claiming Keir Starmer had announced a 32-hour week used fake audio.

    UK law limits how many hours people can work in a week, but it doesn't say how many days, and Parliament's petitions team says that is a decision for employers and staff. The government's changes to employment law are meant to give staff better access to flexible working, such as compressed hours. Some councils and public bodies have tried four-day weeks, and South Cambridgeshire made it permanent in 2025 (see FDW-03). Government policy can change, so newer announcements may differ.

    “the government has no plans to mandate a four-day week for five-days’ pay”
    UK Parliament (written answer from the Department for Business and Trade)·Business: Productivity (written question HL4509, answered 11 February 2025)Government / parliament · 11 Feb 2025 ↗

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