As the UK experiences one of its hottest summers on record, the issue of heat stress in the workplace is no longer a seasonal inconvenience, it’s a growing health and safety concern. With four heatwaves already recorded this year and temperatures soaring past 33°C in some regions, employers must act now to protect their workforce from the risks of working in extreme heat.

What’s Changing and Why It Matters

The Health and Safety Executive (HSE) is currently reviewing its workplace heat regulations, prompted by union campaigns and rising public concern. While there’s still no legal maximum working temperature in the UK, the HSE is consulting on new trigger points for action including heat stress assessments, rest breaks, and access to shade and hydration.

This shift reflects a broader recognition that heat is a workplace hazard, and like any hazard, it demands proactive risk management.

The Risks of Heat Stress

Heat stress occurs when the body can no longer regulate its internal temperature. Symptoms range from fatigue and muscle cramps to heat exhaustion and, in severe cases, heat stroke which can be fatal if not addressed early.

Workers in construction, manufacturing, catering, and outdoor roles are particularly vulnerable, especially when wearing PPE or working in confined, poorly ventilated spaces.

What Employers Should Be Doing

Whether or not new laws are introduced, employers already have a duty under the Workplace (Health, Safety and Welfare) Regulations 1992 to maintain a “reasonable” temperature. That means:

• Conducting heat stress risk assessments
• Providing cool drinking water and shaded rest areas
• Adjusting work schedules to avoid peak heat hours
• Relaxing dress codes where appropriate
• Training staff to recognise early signs of heat stress

The HSE offers a practical heat stress checklist to help employers assess and mitigate risks.

For those looking to strengthen their workplace response, here are some key links to helpful resources:

• HSE Heat Stress Guidance — symptoms, risk factors, and control measures
• Managing Temperature in the Workplace — tips for indoor and outdoor environments
• Dehydration and PPE Advice — hydration strategies when PPE restricts fluid intake

Looking Ahead

Climate change means these heatwaves aren’t one-offs they’re the new normal. As the HSE prepares to update its code of practice, we have a unique opportunity to lead the way in adapting workplaces for a warmer future.

Let’s not wait for legislation to catch up. Employers who act now will be better prepared to protect their teams and meet future standards.

Need Support with Heat Stress Risk Management?

At ST Safety Services Ltd, we help businesses across the UK assess, plan, and implement practical solutions to protect their teams from heat-related risks. Whether you need a tailored risk assessment, staff training, or help updating your policies, we’re here to support you. Contact Us for more information.

Let’s keep your workplace safe, compliant, and ready for whatever the weather brings.