Is your organisation clear on what you must do for pregnant workers during extreme heat? The short answer is to assess the risk, make reasonable adjustments, and suspend on full pay if safety cannot be ensured. In the UK, there is no legal maximum workplace temperature, so your obligation sits in risk control and pregnancy protection rather than a fixed number. This guide explains the law, the steps, and the practical changes that keep people safe.
What are UK employers legally required to do for pregnant workers in extreme heat?
You must assess heat risks for each pregnant worker, put controls in place, and suspend on full pay if risks remain. The duty sits under health and safety law and equality law.
The Management of Health and Safety at Work Regulations 1999 require a specific assessment for new or expectant mothers and proportionate controls. Regulation 16 sets out the duty to alter conditions or hours, offer suitable alternative work, or suspend on paid leave if risks persist. You can read the exact wording in the Management of Health and Safety at Work Regulations 1999, Regulation 16 on legislation.gov.uk.
The Workplace (Health, Safety and Welfare) Regulations 1992 require a reasonable temperature, adequate ventilation, and supply of drinking water. See the Workplace Regulations on legislation.gov.uk. The Health and Safety Executive explains that there is no maximum legal temperature. Your duty is to manage thermal comfort and heat stress.
Equality matters too. Failing to make adjustments, or penalising absence for pregnancy-related heat issues, can amount to pregnancy and maternity discrimination under the Equality Act 2010. The Equality and Human Rights Commission sets out your responsibilities.
If you need help applying these duties in practice, our team can design a clear, values-led approach.
The UK Health Security Agency reported an estimated 2,985 excess deaths among people aged 65 and over in England during the 2022 heat periods. Heat is a material risk that employers must manage.
Is there a legal maximum workplace temperature in the UK?
No. There is no legal maximum temperature. You must keep conditions reasonable and control heat risks.
The Health and Safety Executive confirms that thermal comfort depends on more than air temperature. Air movement, humidity, clothing, workload and individual factors all matter. For pregnant workers, body temperature regulation changes and dehydration risks are higher. This is where your risk assessment and controls matter most.
Industry perspective: Heat management is part of a wider wellbeing duty. Ethical employers take a precautionary approach and act before temperatures peak.
What should a pregnancy heat risk assessment include?
Start with a simple, structured assessment. Consider environment, task and the person, then record the controls you will implement.
Follow this five-step sequence:
1) Identify heat hazards. Note indoor and outdoor temperatures, humidity, radiant heat from equipment, and airflow. Consider travel and stairwells that trap heat.
2) Decide who may be harmed and how. Focus on the pregnant worker, and anyone in similar roles. Consider dehydration, fainting, heat exhaustion and stress.
3) Evaluate the risk and decide on controls. Review workload intensity, shift length, PPE, uniform and dress codes. Identify low-cost and fast actions first.
4) Record, consult and implement. Write the actions, discuss them with the employee, and agree a review date. Give managers clear instructions.
5) Review and update. Reassess at each antenatal stage, after any role change, and whenever a heat-health alert is issued.
Helpful prompts to capture in your assessment:
- Work patterns and tasks. High-exertion tasks raise heat stress. Rotate duties to reduce strain.
- Facilities and ventilation. Check fans, air conditioning, blinds, and shaded rest areas.
- Hydration. Provide cool, accessible drinking water and reminders to drink regularly.
- Clothing and PPE. Switch to lighter fabrics and heat-tolerant PPE where safety allows.
- Breaks and rest facilities. Offer frequent, short breaks in a cool space with seating.
- Commute and travel. Adjust start times or locations to avoid peak heat and crowded transport.
- Lone working. Avoid it during peak heat so help is on hand if the person feels unwell.
We recommend linking your pregnancy risk assessment to Met Office or UK Health Security Agency heat-health alerts. This creates a clear trigger for extra measures when risk rises.
Which adjustments help pregnant employees work safely during hot weather?
Prioritise quick, practical actions first. Then escalate to job or hours changes if needed.
Consider these adjustments and tailor them to the role:
- Cooler work environment. Move workstations away from windows or heat sources. Use blinds, fans, or air conditioning.
- Flexible hours. Start earlier, finish earlier, or split shifts to avoid afternoon peaks.
- Home or hybrid working. Reduce commuting in extreme heat, with a home risk check in place.
- Extra breaks. Offer short, frequent breaks in a cool room. Give seating for standing roles.
- Hydration and nutrition. Provide cool water stations and encourage regular drinking. Allow easy access to snacks.
- Adjusted duties. Reduce strenuous tasks, manual handling, or tasks that require heavy PPE.
- Lighter clothing. Relax dress codes to allow breathable fabrics. Provide heat-tolerant PPE that still meets safety standards.
- Shaded outdoor work. Use canopies, avoid midday sun, and rotate teams on site.
- Emergency response. Brief managers on heat illness signs and the process to stop work quickly.
The Health and Safety Executive provides guidance on recognising and controlling heat stress. For indoor settings, also review the workplace ventilation guidance on the Health and Safety Executive.
How do equality and pay protections apply if work is unsafe due to heat and pregnancy?
If you cannot remove the risk, you must suspend the employee on full pay. This is a legal protection for pregnant workers.
Regulation 16 of the Management Regulations requires you to take a staged approach. First, adjust the role or hours. Second, offer suitable alternative work on no less favourable terms. Third, suspend on maternity grounds with normal pay if risk remains. Entitlement to pay on suspension is supported by the Employment Rights Act 1996, sections 67 to 72.
Treating a pregnant worker unfavourably because of heat-related absence or adjustments may be unlawful under the Equality Act 2010. The Equality and Human Rights Commission explains how to avoid discrimination.
When should you suspend on full pay or offer alternative duties?
Use this simple decision path. It keeps decisions fair, fast and well documented.
Step-by-step sequence:
1) Complete a pregnancy-specific risk assessment focused on heat. Document findings and controls.
2) Implement immediate controls. For example, move to a cooler space, adjust hours, add extra breaks, and relax dress codes.
3) Reassess within 24 to 72 hours. If symptoms persist or alerts escalate, continue to step 4.
4) Offer suitable alternative work on no less favourable terms. Prioritise safe, lower-heat tasks.
5) If risk remains, suspend on maternity grounds with full pay. Confirm in writing and set review dates.
6) Keep in touch respectfully. Review after each heat-health alert change, or antenatal milestone.
The path is straightforward. Control the risk. Offer safe alternative work. Suspend on full pay if you cannot remove the risk.
How do you support outdoor, factory, or PPE-heavy roles ethically?
Plan early, control exposure windows, and switch kit where safe. Hotter roles need more structured controls.
For outdoor or PPE-heavy work, use these measures:
- Plan shifts around sun intensity. Work mornings and evenings. Avoid 11am to 3pm in heat alerts.
- Provide shade and cooling. Use shelters, misting fans and cooled rest areas close to the job site.
- Rotate tasks. Limit continuous exposure in PPE. Build in recovery time.
- Upgrade PPE and uniforms. Use lighter, moisture-wicking options that still meet standards.
- Increase supervision. Train supervisors to spot heat stress quickly and act.
- Provide transport to shaded rest spaces. This reduces walking in full sun.
Renewable energy and construction teams often work at height or with reflective materials that amplify heat. A risk plan tied to alerts is essential.
What should your hot weather and pregnancy policy cover?
Keep it short, practical, and linked to alerts. Clarity helps managers act with confidence.
Include the following elements:
- Purpose and scope. Confirm it applies to all pregnant and breastfeeding workers, across all sites.
- Legal framework. Reference the Health and Safety at Work etc. Act 1974, the Management Regulations 1999, Workplace Regulations 1992, and the Equality Act 2010.
- Trigger points. Tie measures to Met Office or UK Health Security Agency heat-health alerts.
- Adjustments menu. List common controls managers can authorise on the spot.
- Risk assessment process. Include templates and review intervals.
- Escalation to alternative work or paid suspension. Outline the steps and approvals.
- Communication. Set out how you brief teams and record decisions.
- Training. Explain how you train managers to spot heat stress.
Acas gives helpful plain-English tips on workplace temperature. See Acas guidance for more detail.
How should you communicate and document adjustments to protect everyone?
Tell people what will happen before the heat arrives. Then record each decision. Clarity reduces stress.
Use this short communications plan:
- Pre-season briefing. Share the policy and manager checklist in spring. Run a quick Q&A.
- Individual plan. After the first pregnancy risk assessment, agree adjustments and review dates.
- Manager alerts. When an alert is issued, push a simple action list via email or chat.
- Visible prompts. Place signs by water stations and rest areas. Remind people to take breaks.
- Post-heat review. Capture what worked. Improve the plan for next time.
Timeline expectation:
- 4 to 6 weeks before summer. Finalise policy, stock fans and water points, train managers.
- At first heat-health alert. Apply adjustments, log changes, check on individuals at higher risk.
- During prolonged heat. Rotate duties, review daily, and escalate where needed.
- After the season. Review data on incidents and feedback. Update policy.
What if a pregnant employee works from home during a heatwave?
Your duty still applies. Support safe working and check the home environment.
Set clear steps in your homeworking process:
- Home risk check. Ask about room temperature, shading, and ventilation.
- Equipment. Offer a fan or contribution towards cooling where needed.
- Work pattern. Allow early starts or split shifts. Avoid afternoon peaks.
- Breaks and hydration. Encourage regular breaks away from screens and plenty of water.
- Escalation. If risk remains high, consider paid suspension on maternity grounds.
The NHS advises pregnant people to stay cool, drink water, and avoid midday sun. Embed these tips into your communications.
Do heat-health alerts change what employers should do?
Yes. Use alerts as a clear trigger for extra steps and faster reviews.
The Met Office and UK Health Security Agency run a heat-health alert system for England. Alerts signal increased risk to health and services. We recommend mapping your controls to alert levels. For example, at a higher alert, switch to cooler venues, reduce shift lengths, and plan for alternative duties sooner.
Case study:
One ethical food manufacturer we support introduced an alert-based plan. They added early shifts, shaded rest pods, and hydration prompts. During the next two alerts, they recorded a 35% drop in heat-related complaints and no pregnancy-related absences. Simple, early actions worked.
What this means for charities and values-led businesses:
You set the standard for care. Clear action in hot weather protects people and shows your mission in practice. If you run a charity or social enterprise, our team understands the budget and governance context.
Do not wait for a GP note. The legal duty to assess and act exists regardless of medical certificates. Consult the employee, agree changes, and document them.
Ready to put a compliant, compassionate plan in place for hot weather and pregnancy?
Ready to safeguard pregnant workers during extreme heat and stay compliant?
FREQUENTLY ASKED QUESTIONS
What are employers legally required to do for pregnant workers in a heatwave?
You must assess the risk, make adjustments, and suspend on full pay if risks remain. The Management of Health and Safety at Work Regulations 1999 require a pregnancy-specific risk assessment and proportionate controls. If you cannot remove the risk, offer suitable alternative work or suspend on maternity grounds with normal pay. Also avoid discrimination under the Equality Act 2010.
Practical steps include:
- Cooler workspace, flexible hours, and extra breaks
- Hydration, lighter clothing or PPE, and task rotation
- Clear records and regular reviews tied to heat-health alerts
Why is extreme heat a particular risk during pregnancy?
Pregnancy changes heat regulation and increases dehydration risks, so heat stress hits harder. Pregnant people can overheat faster, feel faint, or become dehydrated more quickly. This can affect wellbeing at work and safe travel. Employers should reduce exposure by adjusting hours, workload, and environment. The NHS advises keeping cool, hydrating, and avoiding midday sun, which you can build into your policy. Use short, frequent breaks and provide cool rest areas to prevent issues before they escalate.
What laws cover pregnant workers and hot weather in the UK?
Health and safety and equality laws both apply, and together they set clear duties.
The key laws and guidance are:
- Management of Health and Safety at Work Regulations 1999, Regulation 16
- Workplace (Health, Safety and Welfare) Regulations 1992
- Equality Act 2010 on pregnancy and maternity discrimination
- Health and Safety Executive heat stress and thermal comfort guidance
You must assess risks, control them, and, if needed, suspend on full pay. Document your decisions and consult the employee.
What should a pregnancy heat risk assessment include?
Cover environment, tasks, and the person, then record controls and review dates. Start with temperatures, humidity, and airflow. Consider workload intensity, PPE, uniform, hydration access, and rest facilities. Factor in commute and lone working. Agree adjustments with the employee and set a short review window. Update the assessment when alerts change or at antenatal milestones. Good controls include cooler rooms, flexible hours, extra breaks, lighter clothing, and access to cold water and shade.
How can we quickly reduce heat risks for a pregnant employee?
Start with fast, low-cost changes, then escalate if needed.
Good immediate actions include:
- Move the workstation to a cooler area with fans or blinds
- Switch to earlier shifts or split shifts to avoid afternoon heat
- Provide short, frequent breaks in a cool room and plenty of water
- Relax dress code and lighten PPE where safe If symptoms persist or alerts escalate, review within 24 to 72 hours and consider alternative duties or paid suspension.
How do we handle PPE and outdoor roles during a heatwave?
Plan around peak heat and build in recovery time to keep work safe and humane. For outdoor or PPE-heavy roles, rotate tasks, shorten exposure, and add shaded rest spaces. Switch to lighter, compliant PPE and breathable uniforms. Provide cooling aids like misting fans and cold packs. Schedule work for mornings or evenings. Increase supervision so managers spot heat stress and act quickly. If safe working is not possible, offer alternative duties or suspend on full pay.
How should we link actions to heat-health alerts?
Use alerts as clear triggers so managers know exactly when to act.
A simple model is:
- Yellow alert: extra breaks, hydration prompts, and cooler rooms
- Amber alert: flexible hours, rotate tasks, reduce outdoor work
- Red alert: stop high-heat tasks, switch duties, or suspend on full pay
Brief managers when alerts change. Document the steps you take and review with the employee after each alert period.
What pay applies if we suspend a pregnant worker for heat risks?
If risks cannot be removed and no suitable alternative work exists, suspend on full pay. This protection is set out in health and safety law and the Employment Rights Act 1996. Pay should reflect normal terms and hours, not statutory sick pay. Confirm the suspension in writing, explain the risk, and set review points. If safe, suitable alternative work is offered on no less favourable terms, you can use that instead of suspension.
How do we manage homeworking for a pregnant employee in hot weather?
You still owe a duty of care, so put a home risk check in place. Ask about shading, ventilation, and room temperature. Offer a fan or cooling contribution if needed. Allow earlier starts or split shifts to avoid afternoon peaks. Encourage regular breaks away from screens and plenty of water. If the home environment remains too hot, consider alternative duties on site in a cooler space or suspension on full pay until risks fall.
What should we document to stay compliant and fair?
Keep records of your assessment, agreed controls, and review dates so decisions are clear.
Your file should include:
- The pregnancy heat risk assessment and any updates
- Details of adjustments or alternative duties, with dates
- Communications with the employee and manager briefings
- Triggers used, such as heat-health alerts, and outcomes
Good notes show you acted promptly and proportionately. They also help you refine your plan after the heat has passed.
Related Resources
Find out what employers are required to do to make the workplace more comfortable for employees and workers, including people with disabilities and pregnancy.
See how our ethical HR experts can design practical policies, manager training, and compliant processes for heat and pregnancy.
Talk through your scenario with a senior consultant. We will map your legal duties and suggest tailored next steps.
If you run a charity or social enterprise, explore our values-led HR support that respects your mission and governance.
Field teams in heat need clear, safe systems. Learn how we support renewable and sustainable organisations.
Further Reading
Guidance on thermal comfort, risk factors and practical controls for employers.
Legal duty to assess and control risks for new or expectant mothers and take staged action.
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