The 4 Day Work Week: Hype or the Future of Work?

The UK has now run two major four day work week trials. The results from both are in, and they tell a consistent story.

The first UK trial (2022)

The world's largest four day work week pilot ran between June and December 2022, organized by 4 Day Week Global and researched by Autonomy and Cambridge University. Sixty one companies and over 2,900 employees participated, following the 100:80:100 model: 100% pay for 80% of previous hours, in exchange for maintaining 100% productivity.

The results, published by Autonomy Institute:

Among the 41 companies that shared productivity data, 46% said productivity stayed the same, 34% said it improved, and 15% said it significantly improved. Business revenue stayed broadly the same across participants.

On the employee side: there was a 65% reduction in sick days and 71% of employees reported lower levels of burnout. Employee turnover dropped by 57% compared to the same period a year earlier.

When the trial ended, 92% of participating companies decided to keep the four day week permanently.

The second UK trial (2024 to 2025)

A second pilot began in November 2024 with 1,000 workers from 17 businesses. It ran for six months and the results were published in 2025.

The outcome: all 17 companies plan to continue the four day week permanently. The trial found a 62% reduction in reported burnout, and companies maintained service standards and key performance metrics throughout.

Why it works

Parkinson's Law in action. Work expands to fill the time available. If you have five days to complete a task, it takes five days. If you have four, it takes four. Most knowledge workers don't spend eight productive hours a day anyway. Studies consistently show that the average office worker does about 3 to 4 hours of focused work per day. A four day week cuts the unproductive time, not the productive time.

Burnout is productivity's enemy. A burnt out worker doesn't produce 80% of what a fresh worker produces. They produce far less, and the quality degrades. An extra day of rest each week prevents the cumulative exhaustion that makes Friday output nearly worthless at most companies.

Retention saves money. The 57% drop in turnover from the first UK trial is enormous. Hiring and onboarding a single employee can cost $25,000 to $50,000. If a four day week dramatically reduces turnover, the cost savings alone justify the policy.

Why most companies haven't adopted it

Management by presence. Many managers equate hours worked with value delivered. If employees produce the same output in four days, it means they were never fully utilized for five. That's uncomfortable for managers who built careers on the traditional model.

Client expectations. Service businesses worry about five day coverage. This is solvable with staggered schedules (half the team off Friday, half off Monday), as many trial companies demonstrated. But it requires restructuring.

Equity concerns. Factory workers, nurses, and teachers can't simply take Fridays off. The four day week is largely a knowledge worker discussion, which creates tension around workplace fairness.

What a four day week actually looks like

True 32 hour week. Four eight hour days with the same pay. This is what the UK trials studied and where the strongest results come from. It requires genuinely cutting waste and improving focus.

Staggered days off. Half the team takes Friday off, the other half takes Monday off. Maintains five day coverage while giving everyone a three day weekend.

Compressed hours. Same 40 hours, compressed into four ten hour days. This is technically not reduced hours and doesn't capture the same wellbeing benefits as a true 32 hour week.

How to find companies that offer it

When evaluating companies, don't just ask "do you offer a four day week?" Ask about actual working hours, meeting culture, after hours expectations, and how they measure productivity. A company that works five days but has no meeting Fridays and trusts you to manage your time is functionally closer to a four day week than you might think.

Use Laddro to explore companies and read between the lines of their culture. Pay attention to benefits that signal trust: flexible hours, output based performance reviews, and genuine respect for time off. These are the companies most likely to adopt shorter work weeks, and the most likely to treat you like an adult in the meantime.

The evidence is clear. The question is no longer "does it work?" but "when will more companies catch up?"