There is no legislation governing the maximum temperature in an office or workplace but employers must stick to the health and safety at work law, including:
– keeping the temperature at a comfortable level, sometimes known as thermal comfort
– providing clean and fresh air.
In some workplaces extreme temperatures are not seasonal but are created by the work, like in some manufacturing processes.
Employers should carry out a risk assessment and take extra steps to ensure the workforce is comfortable. In the summer this may be providing fans or opening windows, relaxing dress code or providing cool drinks and moving work stations out of direct heat or sunlight.