With the UK’s third heatwave almost upon us, we ask how hot is too hot to work, as workplace temperatures are likely to become an immediate concern for both employers and employees. Employees may be getting hot and bothered about their working conditions and complaining that high temperatures are having a negative impact on their ability to work safely. That’s why it’s important to understand the legal framework around heat at work, and what responsibilities employers have to help keep everyone safe and comfortable.
Regulations on workplace temperatures
The UK does not have a specific legal maximum or minimum temperature for workplaces. Instead, the Workplace (Health, Safety and Welfare) Regulations 1992 require employers to maintain a “reasonable” indoor temperature.
The guidance accompanying these regulations recommends a minimum temperature of 16°C for sedentary work indoors and 13°C for more physically demanding tasks. However, there is no recommended maximum temperature, leaving the burden upon the employers to determine a reasonable upper limit.
Under the Health and Safety at Work Act 1974, employers must take all “reasonably practicable steps” to protect employees’ health and safety, which includes managing risks associated with excessive heat.
Calls for legislative change
There have been calls to introduce clear legal limits on workplace temperatures. In 2022, a group of 33 Members of Parliament proposed a maximum indoor working temperature of 30°C, lowered to 27°C for physically demanding work. Trade unions, however, differ in their positions: the GMB supports a 25°C threshold, while the Trades Union Congress (TUC) advocates suspending indoor work entirely at 30°C.
No legislative changes have yet been implemented, partly due to the diverse nature of workplaces.
Employer responsibilities
Employers must carry out risk assessments related to heat. The Health and Safety Executive (HSE) recommends practical measures such as:
- Providing thermometers and local temperature control options (e.g., fans, air conditioning)
- Relaxing dress codes during periods of high temperatures
- Ensuring access to free drinking water
- Offering training to recognise and respond to heat stress symptoms
- Positioning workstations away from direct sunlight
- Using blinds or reflective films on windows
- Keeping windows open where feasible
Considerations for home workers
As previously discussed, employers have a duty to take “reasonably practicable” steps to ensure the safety of staff under the Health and Safety at Work Act 1974, this extends to those who work from home. While there is no obligation to provide cooling equipment for home workers, employers should offer guidance on managing heat and maintain regular contact.
How Moore Barlow can assist
Although there is no current legal maximum temperature for workplaces, employers must still strive to provide safe and comfortable environments. With climate change intensifying and hot weather becoming more common in the UK calls for reform are increasing. As an employer understanding your legal responsibilities is vital. Our employment law team supports businesses in developing effective policies and risk management strategies to meet these evolving challenges so please don’t hesitate to contact us if you would like any support.
