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Hot days in the office: What employers need to know

Britain is in the middle of a heatwave, with the potential for the hottest July days since the seventies.

Public Health England have issued a health warning to look out for instances of heat exhaustion, heatstroke, dehydration and overheating. This isn’t just a worry on the beach, but in the hot days in the office are a worry too.

hot days in the officeCurrent UK workplace regulations state that employers must act when the temperature dips below 16C, however there is no maximum temperature. We are expecting temperatures of 33C this week and given the lack of regulations, has created an employer guide on how to beat the heat, the details of which can be found below.

Peter Ames, head of strategy at, said: “While there are no specific guidelines on when it is too hot to work, there are a number of regulations employers and employees alike need to be aware of as the mercury rises.

“For employers, it is your responsibility to do everything you can to ensure the safety and comfort of your employees, this could be anything from bringing in fans to instigating a work-from-home policy. If temperatures do become uncomfortable, and you do not act, you could be at risk of legal action.

“For employees, with no temperature guidance at the top end, you have the power to force changes. If temperatures genuinely are uncomfortable, and a significant swathe of the workforce do complain, employers simply have to act.”

Existing regulations and what employers should be aware of:

  • Workplace (Health, Safety and Welfare) Regulations 1992 state an indoor workplace should be a minimum of 16⁰C, or 13⁰C if work involves considerable physical exercise
  • Regulation 7: “During working hours, the temperature in all workplaces inside buildings shall be reasonable.”
  • Associated Approved Code of Practice: “The temperature in workrooms should provide reasonable comfort without the need for special clothing. Where such a temperature is impractical because of hot or cold processes, all reasonable steps should be taken to achieve a temperature which is as close as possible to comfortable.”
  • There is no guideline temperature given at the top end
  • Health and Safety Executive (HSE): “an acceptable zone of thermal comfort for most people in the UK lies roughly between 13°C (56°F) and 30°C (86°F)”
  • HSE: “A meaningful figure cannot be given at the upper end of the scale. This is because the factors, other than air temperature which determine thermal comfort.”
  • Workplace Regulations, the Management of Health and Safety at Work Regulations 1999: Employers are obliged to assess risks to health and safety – act where necessary (i.e. if the workplace drops below the minimum guideline or if it is felt the temperature is too high)

When to act

Employers are advised that a thermal risk assessment may be necessary in the following circumstances:

  • Air conditioned offices: If more than 10% of employees are complaining
  • Naturally ventilated offices: If more than 15% of employees are complaining
  • Retail businesses, warehouses, factories and all other indoor environments that may not have air conditioning: When more than 20% of people complain

Steps to take for hot days in the office

If the thermal risk assessment shows heat to be a risk to health and safety in the workplace, the following steps are advised by HSE:

  • Controlling temperature using fans or air conditioning.
  • Provide mechanical aids to reduce employee work rate.
  • Prevent exposure through:
    • Allowing workers into the workplace in cooler parts of the day
    • Issue permits to specify how long workers spend in high-risk situations
    • Providing rest breaks
    • Ensuring rest areas provide cooler conditions
  • Prevent dehydration by supplying access to cold water
  • Relax dress codes to increase employee comfort
  • Provide specialised personal protective equipment designed for comfort in hot conditions

Good practice for hot days in the office

All employers are also advised the following steps are good practice in creating a low-risk workplace:

  • Insulate hot water pipes
  • Provide air conditioning and fans, specifically in hot weather
  • Ensure all windows can be opened
  • Keep workstations out of direct sunlight and away from sources of heat
  • Identify employees at greatest risk
  • Train workers to be able to identify symptoms of heat stress and appropriate solutions
  • Provide sufficient thermometers to evaluate temperature throughout the workplace