Sun Safety for Outdoor Trades — Protecting Workers from UV and Skin Cancer (2026)

Why Sun Safety Matters for Outdoor Trades

The danger with sun exposure is that it is cumulative and largely invisible day to day. An outdoor worker can clock up several times the UV dose of an office worker over a career, and the damage adds up quietly until it shows as skin cancer years later. Because there is no immediate pain — beyond the occasional burn — it is easy to treat sun as a non-issue. That is exactly why it gets overlooked on risk assessments.

Heat is the other half of the problem. The same conditions that drive up UV also bring dehydration, heat exhaustion and, at the extreme, heat stroke. On a roof or scaffold, a worker who becomes light-headed or disoriented is also a falls risk — so heat and UV controls protect against more than skin damage alone.

What the Law Expects

Sun and heat exposure are health and safety risks like any other, and the same duties apply. Under the Health and Safety at Work etc. Act 1974 you have a general duty to protect the health, safety and welfare of your workers so far as is reasonably practicable. The Management of Health and Safety at Work Regulations 1999 require you to assess the risks your workers are exposed to — and for outdoor trades that assessment should explicitly cover UV and heat.

In practice that means UV and heat stress belong in your written risk assessment and method statements (RAMS), with the controls you have chosen recorded and communicated to the team. It is not enough to hand out sunscreen and hope — the law expects you to identify the risk, decide on proportionate controls, and make sure they are actually used. Toolbox talks are the standard way of doing the last part.

The Skin Cancer Link

Prolonged exposure to ultraviolet radiation damages skin cells and, over time, drives both non-melanoma skin cancers (such as basal cell and squamous cell carcinoma) and melanoma, the most dangerous form. Non-melanoma skin cancer is one of the most common cancers in the UK, and outdoor workers are disproportionately affected because of the dose they receive on the job — particularly to the face, ears, neck, forearms and the back of the hands.

A common misconception on site is that UV is only a problem on hot, sunny days. It is not. UV passes through cloud, so workers can burn on an overcast day without feeling the heat that would normally prompt them to cover up. In the UK the risk is highest from April to September, and around the middle of the day, but exposure happens whenever you are working outdoors in daylight.

The simplest daily guide is the UV Index, published in most weather forecasts. As a rule of thumb, when the UV Index reaches 3 or above, skin protection is needed — and in a UK summer it regularly sits at 6 to 8. Build a quick UV Index check into the start of the working day, the same way you would check the wind for working at height.

Practical Controls — Follow the Hierarchy

You cannot eliminate the sun, so sun safety is about reducing exposure through a sensible hierarchy of controls. Tackle the work organisation first, then the physical barriers, and treat sunscreen as a top-up rather than the main line of defence.

1. Reschedule and Organise the Work

Where it is practical, plan the most exposed or physically heavy tasks for earlier and later in the day, and move people into shade or indoor work around the peak UV period — roughly 11am to 3pm. Rotating tasks so the same person is not exposed on the open south face all day spreads the dose across the team rather than concentrating it on one worker.

2. Use Shade

Make use of natural shade where it exists, and erect temporary shade — gazebos, canopies, debris-netted scaffold, or shaded welfare and break areas — where it does not. A shaded spot for breaks also doubles as a place to cool down and rehydrate, which directly reduces heat stress.

3. Provide and Encourage Suitable Clothing

Covering up is the most effective barrier against UV. Encourage long-sleeved tops and long trousers in close-weave fabric, and collared shirts to protect the neck. For the head, a wide-brim or legionnaire-style hat shades the ears and neck — areas that baseball caps miss entirely. Where a hard hat is required, use a hat or neck flap designed to fit under or with it, or a brim attachment, rather than asking workers to choose between head protection and sun protection.

4. Provide Sunscreen

Supply SPF 30 or higher, broad-spectrum sunscreen (protecting against both UVA and UVB) for the skin that clothing cannot cover — face, ears, neck and the backs of the hands. Sunscreen wears off with sweat and rubbing, so it needs reapplying through the day. Treat it as the last line, not the first: it complements clothing and shade, it does not replace them.

5. Provide Drinking Water

Make cool drinking water freely available at the work area and encourage workers to drink regularly before they feel thirsty — thirst is already a sign of mild dehydration. Easy access to water on the scaffold or in the welfare unit makes regular hydration realistic rather than a trek.

Awareness and Early Detection

Controls reduce exposure, but workers also need to know what to look for on their own skin. Skin cancer caught early is highly treatable, so train the team to check themselves for changes and to report anything new or unusual without delay — there should be no awkwardness about flagging a suspicious mole.

A useful framework for checking moles is the ABCDE guide. See your GP if a mole or patch shows any of these:

• A — Asymmetry: the two halves do not match.
• B — Border: edges are ragged, blurred or irregular.
• C — Colour: uneven, or more than one shade.
• D — Diameter: larger than about 6mm, or growing.
• E — Evolving: changing in size, shape, colour, or starting to itch, bleed or crust.

A short toolbox talk at the start of summer is the natural moment to cover all of this — the UV Index habit, the day's controls, the clothing and sunscreen on offer, and the ABCDE self-check. Repeating it each season keeps sun safety from quietly dropping off the agenda.

Heat Stress — Spotting and Preventing It

Working hard in the heat, often in PPE that traps warmth, can push the body past its ability to cool itself. Heat-related illness sits on a spectrum, and recognising the early signs lets you act before it becomes an emergency.

• Heat cramps: painful muscle spasms, often in the legs or abdomen, an early warning of fluid and salt loss.
• Heat exhaustion: heavy sweating, tiredness, dizziness, headache, nausea, fast pulse and clammy skin. The worker needs to stop, move to shade or a cool area, rest, and rehydrate.
• Heat stroke: a medical emergency. Signs include confusion, hot dry skin (sweating may stop), a high temperature, rapid breathing and loss of consciousness. Call 999 immediately and cool the person while you wait for help.

Prevention follows the same logic as UV control: plenty of cool water, regular breaks in the shade, and pacing the heaviest work for the cooler parts of the day. Allow new starters, and anyone returning after time off, to acclimatise gradually rather than going straight to full exertion in the heat. Encourage workers to keep an eye on each other — someone showing early signs may not notice it themselves.

Putting It in Your RAMS

None of this counts as a control until it is written down and communicated. Capture UV and heat stress in your risk assessment and method statements: identify who is exposed, record the controls you have chosen — shade, clothing, sunscreen, hydration, scheduling and awareness — and note who is responsible for making sure they happen. Then back it up with a seasonal toolbox talk so the team knows what is provided and what is expected of them.

Documenting it does more than satisfy your duty under the law. It signals to your workers that you take their long-term health seriously, and it gives you a clear record that the risk was assessed and managed should it ever be questioned.

Quick Reference: Sun and Heat Controls