Common questions about noise and vibration on construction sites.
What are the noise exposure limits on a construction site?
The Control of Noise at Work Regulations 2005 set three key levels that every employer needs to know. The lower exposure action value is 80 dB(A) averaged over an eight-hour working day. Once your workers hit this level, you must carry out a noise risk assessment and make hearing protection available to anyone who wants it — you cannot refuse a request. The upper exposure action value is 85 dB(A). At this level, hearing protection becomes mandatory, not optional. You must provide suitable hearing protectors, enforce their use, and designate hearing protection zones with clear signage. You also need to implement a programme of noise reduction measures to bring exposure down as far as reasonably practicable. The exposure limit value is 87 dB(A), and this must not be exceeded under any circumstances. Crucially, when calculating whether you have hit the 87 dB limit, you take into account the protection provided by hearing protectors — so the limit is the actual exposure at the ear, not the ambient noise level. In practice, most construction tasks involving power tools will put you above the lower action value of 80 dB(A), and many will put you above 85 dB(A). An angle grinder running at 105 dB means you hit your daily limit in under 15 minutes of unprotected exposure. The key takeaway is that noise assessments are not a nice-to-have on construction sites — they are a legal necessity for virtually every project that involves power tools or heavy plant.
What is Hand-Arm Vibration Syndrome (HAVS)?
Hand-Arm Vibration Syndrome is a group of conditions caused by regular and prolonged use of vibrating hand-held power tools. It affects the nerves, blood vessels, muscles, and joints of the hand, wrist, and arm. The most well-known symptom is vibration white finger, where the fingers go white and numb in response to cold or vibration. This happens because the blood vessels in the fingers become permanently damaged and go into spasm, cutting off the blood supply. Other symptoms include tingling and numbness in the fingers that does not go away, loss of grip strength making it hard to pick up small objects or do fiddly work, pain in the hands and wrists, and reduced sensitivity to touch and temperature. The critical thing to understand about HAVS is that it is irreversible once established. There is no cure and no operation that will fix it. Once the damage is done to the nerves and blood vessels, it is permanent. Early symptoms like occasional tingling or white finger episodes in cold weather might seem minor, but they are warning signs of progressive damage. Under the Control of Vibration at Work Regulations 2005, employers must carry out health surveillance for any workers who are regularly exposed to hand-arm vibration above the exposure action value of 2.5 m/s². This means annual questionnaires and, where symptoms are reported, referral for a clinical assessment. Health surveillance exists to catch HAVS early, before the damage becomes severe. If you use tools like breakers, hammer drills, grinders, or sanders regularly, you are at risk. The HSE estimates that around two million workers in the UK are exposed to levels of hand-arm vibration that put them at risk of developing HAVS.
Do I need to provide hearing protection for my workers?
Yes, in almost every situation involving construction power tools, you will need to provide hearing protection. The law is clear: at the lower exposure action value of 80 dB(A), you must make hearing protection available to any worker who asks for it. At the upper exposure action value of 85 dB(A), you must provide hearing protection and ensure it is worn — no exceptions. Consider the noise levels of common construction tools: an angle grinder produces 100–110 dB, a circular saw 100–105 dB, a hammer drill 95–100 dB, and a concrete breaker 100–115 dB. All of these exceed 85 dB(A), which means hearing protection is mandatory whenever these tools are in use. But hearing protection is not just about handing out a box of foam earplugs. You need to select protectors that reduce the noise at the ear to below 85 dB(A) and ideally to around 80 dB(A). Over-protection is also a problem — if the protectors cut out too much noise, workers cannot hear warnings, alarms, or instructions, which creates a different safety risk. You also need to provide training on how to fit and use hearing protectors correctly. A poorly fitted earplug provides almost no protection. Muff-style protectors need a good seal around the ear, which means removing hard hats and safety glasses can be necessary to achieve it — or you use compatible products designed to work together. Finally, you must maintain hearing protectors. Damaged or worn-out protectors do not protect. Replace them regularly, store them properly, and keep them clean.
How do I know if my tools exceed vibration limits?
Every power tool manufacturer is required to declare the vibration emission value for their tools. You will find this in the tool’s technical documentation, instruction manual, or on the manufacturer’s website. The figure is given in metres per second squared (m/s²) and represents the vibration level measured under standardised test conditions. However, the declared value is only a starting point. Real-world vibration levels are usually higher than the manufacturer’s declared figure because of differences in the material being worked, the condition of the tool, the type of accessory fitted, and how hard the operator presses. The HSE recommends multiplying the manufacturer’s declared value by a factor to account for real-world conditions — typically around 1.5 to 2 times the declared value. To calculate whether your workers exceed the exposure action value of 2.5 m/s² or the exposure limit value of 5 m/s², you need to combine the vibration magnitude with the daily exposure duration. The HSE provides a free online exposure calculator and ready-reckoner charts that make this straightforward. You enter the vibration magnitude of the tool and the time the worker uses it each day, and the calculator tells you whether you are above or below the limits. If a worker uses multiple vibrating tools during the day, you need to combine all the exposures. For example, an hour on a breaker in the morning and two hours on a hammer drill in the afternoon both count towards the daily limit. Keep records of your vibration assessments and the tools your workers use. This is essential evidence for health surveillance and enforcement purposes.
What is a hearing protection zone?
A hearing protection zone is a defined area on a construction site where noise levels exceed the upper exposure action value of 85 dB(A) and wearing hearing protection is mandatory for everyone who enters. Under the Control of Noise at Work Regulations 2005, you must mark these zones with clear signage using the standard blue mandatory sign showing ear protectors. Anyone entering the zone — whether they are operating the noisy equipment or just walking through — must wear suitable hearing protection. In practice, on a construction site, hearing protection zones are usually set up around fixed noisy activities like cutting stations, grinding areas, or where breakers are being used. The boundary of the zone should be set at the point where noise drops below 85 dB(A). You can measure this with a sound level meter, or as a rough guide, if two people standing a metre apart have to shout to be heard, the noise level is probably around 85 dB(A) or above. Setting up a hearing protection zone is not just about putting up signs. You need to ensure that hearing protection is available at the boundary of the zone so people can put it on before entering. You need to enforce the rule — if people are walking through without protection, you are not complying with the law. You should also think about whether the zone can be relocated or reduced by moving noisy activities to less populated areas of the site or by using noise barriers and enclosures. The zone approach works well because it protects not just the tool operator but everyone in the vicinity. Noise does not stop at the person using the grinder — it affects everyone within range. A well-managed hearing protection zone with proper signage and enforcement is one of the most effective ways to protect your workforce from noise-induced hearing loss.