Seventeen companies in the UK that participated in a six-month trial of a four-day working week have decided to make the model permanent, following notable gains in staff well-being, mental health, and productivity. The trial, which involved nearly 1,000 employees across various sectors, was organised by the 4 Day Week Foundation and studied by Boston College.
During the trial, participating businesses reduced work hours without cutting pay. Twelve companies adopted the four-day week permanently, while five opted for a “nine-day fortnight,” offering employees every other Friday off. The companies ranged from housing associations to professional bodies, with team sizes varying from under five employees to more than 400.
Research showed significant benefits for workers, with 62% reporting less frequent burnout, 41% seeing improved mental health, and 45% expressing greater life satisfaction. Businesses also saw positive changes in recruitment, retention, and employee morale.
The success of the trial has led to the permanent adoption of the model by over 235 UK businesses, supporting more than 6,000 employees. Advocates believe the growing interest signals a shift towards wider acceptance, with businesses balancing productivity gains against improved work-life balance.
