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Battling the Heat: Managing High Temperatures in the Office

With the summer sun finally hitting the shores of the UK this week, many workplaces face an increased risk of heat stress. While there's no specific legal maximum working temperature in the UK, employers have a duty to ensure that workplace conditions are safe and reasonable.


The Legal Bit

The Workplace (Health, Safety and Welfare) Regulations 1992 stipulate that the temperature in indoor workplaces must be "reasonable." This doesn’t mean there’s a set maximum temperature; instead, employers must conduct risk assessments and implement measures to ensure the workplace is safe and comfortable.


The Role of Legislation and Enforcement

Some have proposed introducing a specific maximum indoor working temperature law, but better enforcement of existing regulations might be more effective. The Health and Safety Executive (HSE), responsible for enforcing these laws, has faced significant funding and staff cuts, limiting its ability to act. Strengthening the HSE’s capacity could ensure better compliance with existing laws.


Addressing Legal and Practical Standards

Employers must assess and manage the risk of excessive heat as part of their legal duty. The concept of "reasonably practicable" is key, balancing the risk against the measures needed to control it. Employers should consult with employees during the risk assessment process to ensure their concerns are addressed and to identify effective strategies.


Why Offices Overheat

Several factors contribute to the rise in office temperatures:

  • Poor Ventilation: Sealed windows and reliance on HVAC systems can make it hard to manage temperature effectively.

  • Electronic Equipment: Computers and other devices generate significant heat.

  • Office Layout: Open-plan offices can trap heat, creating an uncomfortable environment.

  • High Occupancy: More people in a space increase the ambient temperature.


Strategies to Combat Office Heat

To manage heat in the office, employers can implement a range of measures:

  1. Optimise Ventilation and Air Conditioning:

  • Ensure HVAC systems are well-maintained and functioning efficiently.

  • Use fans to improve air circulation.

  • Open windows during cooler times of the day for natural ventilation.

  1. Adjust Work Schedules:

  • Implement flexible working hours to allow employees to work during cooler parts of the day if possible.

  • Encourage remote working when possible.

  1. Modify the Workspace:

  • Use blinds or reflective window film to reduce heat gain from sunlight.

  • Rearrange workstations to avoid direct sunlight or proximity to heat-producing equipment.

  • Insulate hot pipes or plant equipment.

  1. Promote Hydration and Regular Breaks:

  • Provide easy access to cool drinking water and encourage regular hydration.

  • Schedule frequent breaks to allow employees to cool down.

  1. Dress Code Adjustments:

  • Relax dress codes to allow for lighter, breathable clothing.

  1. Employee Education:

  • Raise awareness about the signs of heat stress and the importance of staying cool and hydrated.

  • Encourage employees to report any symptoms of heat-related illness.


Climate Change and Long-Term Solutions

Addressing the broader issue of a hotter climate requires a focus on sustainability and reducing emissions. Better insulation and cleaner energy sources are crucial. While these are areas for government leadership, businesses can contribute by adopting green practices and improving building efficiency.



As temperatures rise, it’s crucial for employers to proactively address the challenges posed by a hot office environment. By implementing a combination of practical measures and fostering a culture of awareness, workplaces can ensure the wellbeing and productivity of their employees during the summer months. Embracing the British summertime with preparation and resilience ensures that everyone can work comfortably, no matter the weather.


Check out our other blogs in the series:


If you have any questions regarding HR or Health & Safety, get in touch via or ring us on 01793 311937.


The content of our blogs is intended for general information and not to replace legal or other professional advice.


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