Working safely indoors in hot weather

Although there is no law in the UK about when it’s too hot to work, when temperatures are consistently in the high 20Cs and above 30C, employers and employees should take steps to work safely indoors in hot weather.

Employers have a legal obligation to provide clean and fresh air and keep temperatures ‘reasonable’ in indoor workplaces all year round. The temperatures are not legally defined; it is the employer’s duty to determine what ‘reasonable’ comfort is in varying conditions.

The minimum temperature in a workplace should normally be at least 16C, as suggested by the Workplace (Health, Safety and Welfare) Regulations 1992 Approved Code of Practice.

To avoid overheating and heat stress when working in hot conditions, it is recommended:


  • use a fan to increase air movement
  • use window blinds to reduce heat from sunlight
  • drink plenty of water, and avoid caffeinated or carbonated drinks
  • if possible, work away from direct sunlight
  • take regular breaks to cool down
  • if you think there is a problem with heat in your workplace, raise the issue with your managers


  • where possible, ensure windows are open and fans are provided, keep air conditioning units well maintained and radiators switched off
  • consider flexible hours to help avoid the worst affects of working in hot weather
  • relax formal dress codes
  • move workstations away from direct sunlight
  • assess thermal comfort as part of workplace risk assessments

For support with protecting your employees all year round, contact us today.

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