Is It Too Hot or Too Cold to Work?

Understanding UK Workplace Temperature Law & How to Protect Your Workforce

Maintaining a safe and comfortable workplace temperature isn’t just about comfort – it’s a legal requirement and a fundamental part of protecting workers’ health and wellbeing. From freezing warehouses to overheating plant rooms and outdoor construction sites, temperature extremes can lead to fatigue, reduced concentration, illness and, in severe cases, life-threatening conditions such as heat stress or hypothermia.

This guide summarises UK legal expectations, practical control measures, and how Lighthouse Safety’s Compliance Team can support your organisation with retained advice and accredited training.

What the Law Says About Workplace Temperature

Guidance from the UK’s regulator, the Health and Safety Executive, makes it clear that employers must provide a reasonable working temperature and control risks linked to hot or cold conditions.

Key legislation includes:

• Workplace (Health, Safety and Welfare) Regulations – require employers to provide a reasonable indoor temperature.

• Construction (Design and Management) Regulations – require reasonable temperatures for indoor areas on construction sites and protection from adverse weather outdoors.

• Management of Health and Safety at Work Regulations – require employers to assess temperature risks and implement suitable controls.

Minimum Workplace Temperature (Indoors)

The Approved Code of Practice suggests:

• At least 16°C for most indoor work

• At least 13°C where work involves rigorous physical effort

There is no legal maximum temperature in the UK. However, heat is classed as a hazard, and employers must ensure risks are properly controlled.

Working in Cold Temperatures

Cold environments can increase the risk of:

• Cold stress and hypothermia

• Reduced manual dexterity

• Slips, trips and falls

• Fatigue and reduced concentration

Practical Controls

Employers should consider:

• Adequate workplace heating

• Portable or localised heaters where needed

• Reducing draughts while maintaining ventilation

• Insulated floor coverings or specialist footwear

• Suitable thermal PPE and clothing

• Warm rest facilities and hot drinks

System of Work Adjustments

• Job rotation to limit exposure

• More frequent warm-up breaks

• Scheduling colder tasks for shorter durations

Working in Hot Temperatures

Hot conditions can lead to:

• Heat stress and heat exhaustion

• Dehydration

• Reduced concentration and increased accident risk

Practical Controls

• Fans, air-cooling or air-conditioning

• Good ventilation and openable windows

• Shading from direct sunlight

• Positioning workstations away from heat sources

• Insulating hot pipes and machinery

• Providing cool drinking water

Adjusting Work Patterns

• Flexible start/finish times

• Job rotation to cooler areas

• More frequent rest breaks

• Relaxed dress codes where safe to do so

Outdoor Working

For workers exposed to outdoor conditions, employers must protect against:

• Extreme heat, cold, wind and rain

• Sun exposure and UV risks

• Dehydration and fatigue

Controls may include shelters, weather-appropriate PPE, task planning around weather conditions, and additional rest breaks.

PPE and Temperature

While PPE is essential, it can increase body temperature and restrict sweat evaporation. Employers should:

• Allow slower work rates and more frequent breaks

• Rotate workers more often

• Provide facilities for drying PPE

• Consider lighter or more ergonomic PPE where suitable

• Schedule work for cooler times of day

Workers must still wear PPE correctly and not compromise safety by loosening or removing it.

Assessing the Risk

Employers should:

• Assess temperature risks for all work activities

• Consult with workers or safety representatives

• Put suitable controls in place

• Review assessments during seasonal changes or extreme weather

Where workers report discomfort or illness, risk assessments should be revisited immediately.

British Standards for Cold Stress

While not mandatory, compliance with relevant British Standards can help demonstrate good practice, including:

• BS EN 511 – Protective gloves against cold

• BS EN ISO 15743 – Cold workplaces: risk assessment and management

• BS 7915 – Working practices in cold indoor environments

How Lighthouse Safety Can Support You

Lighthouse Safety’s Compliance Team provides retained health & safety support to help organisations manage workplace temperature risks effectively. This includes:

• Risk assessment reviews

• Policy and procedure development

• Ongoing compliance advice

• Site inspections and audits

In addition, accredited training courses provide a strong foundation of knowledge for managers and supervisors, including:

• IOSH Managing Safely

• IOSH Managing Sustainably

• NEBOSH General Certificate

These courses help develop practical understanding of hazard identification, risk assessment, and the implementation of effective controls – including environmental factors such as temperature.

There may be no legal maximum temperature in UK workplaces, but there is a clear legal duty to control risks from heat and cold. By combining sensible workplace controls, regular risk assessments, and robust training, employers can significantly reduce the risk of temperature-related illness and incidents.

If you’d like to strengthen your approach to workplace temperature management, speak to Lighthouse Safety about retained compliance support or upcoming IOSH and NEBOSH courses.

To discuss compliance or training contact us on:

01634 260 631

[email protected]

Keeping people safe isn’t seasonal – it’s a year-round commitment.