Our clients are often surprised that there is no legal guidance on maximum workplace temperature. 

The Workplace (Health, Safety and Welfare) Regulations 1992 says that employers must maintain a reasonable temperature, but it does not specify a maximum temperature. 

There is guidance on when it's too cold to work with the Regulations specifying a minimum temperature of 16°C, or 13°C if the work involves considerable physical activity.

In this current heat wave, the guidance for Employers is to 

  • keeping the temperature at a "comfortable level"
  • provide clean and fresh air
  • consider relaxing dress codes where appropriate
  • encourage employees to notify them if the temperature becomes uncomfortable
  • consider work schedules and allow more regular breaks for employees whose work is physically active