Needing a special safety sign? Why not create your own?
The question we hear most often is not whether noise is a problem, but at what point it becomes a legal obligation to do something about it. You might have machinery that sounds loud, areas where people raise their voices to be heard, or equipment that makes your ears ring after a shift. The law sets out specific noise levels that trigger different actions, including the requirement for warning signs. Let me explain exactly when you need signage and what type is appropriate for each situation.
The Control of Noise at Work Regulations 2005 establishes three critical noise levels that determine your legal obligations. These are based on daily or weekly average exposure and peak sound pressure levels.
Lower Exposure Action Values: 80 dB(A) daily or 135 dB(C) peak
At this level, you must provide information about noise risks and make hearing protection available on request. Warning signs are good practice but not strictly mandatory. However, if you have identified specific areas or equipment that consistently reach this level, noise warning signs help workers make informed decisions about protection.
Think of 80 dB(A) as roughly equivalent to a busy street, heavy traffic, or an alarm clock at close range. In workplaces, this might be a vacuum cleaner, food mixer or hand tools in continuous use.
Upper Exposure Action Values: 85 dB(A) daily or 137 dB(C) peak
This is the critical threshold. Once noise reaches 85 dB(A), hearing protection becomes mandatory, and you must designate and clearly mark hearing protection zones. Warning signs are now a legal requirement as part of your duty to inform workers. The HSE guidance makes clear that visible signage is expected at zone boundaries.
At 85 dB(A), you would struggle to hold a normal conversation without raising your voice significantly. Common examples include angle grinders, circular saws, heavy printing machinery, large compressors and busy workshop environments.
Exposure Limit Values: 87 dB(A) daily or 140 dB(C) peak
These are absolute legal limits that must never be exceeded, even with hearing protection. If your assessment shows noise approaching these levels, immediate engineering controls are essential alongside highly visible warning signage indicating extreme hazard. For more detail on legal requirements, see our guide on whether noise hazard signs are a legal requirement.
At 87 dB(A), you are looking at pneumatic drills, gunfire, chainsaws and explosives. This is where damage occurs rapidly, even with protection.
Not all noise signs serve the same purpose. Understanding the difference helps you choose compliant signage that meets your legal obligations.
Warning Signs (Yellow Triangle)
Warning signs alert workers to the presence of a noise hazard. These use the familiar yellow triangle with black border and typically show the ear protection symbol. Use warning signs at lower exposure action values (80 dB) or to mark the approach to noisier areas. The message is “be aware, protection is available.”
Mandatory Signs (Blue Circle)
Mandatory signs require a specific action. These use a blue circle with white pictogram and are required at upper exposure action values (85 dB and above). The sign states “hearing protection must be worn” and compliance is not optional. For guidance on where these signs should go, read where ear protection signs should be displayed on site.
Both sign types must comply with ISO 7010 standards to ensure universal recognition across multilingual workforces.
Understanding abstract decibel numbers is easier when you see real-world examples from different sectors.
Construction regularly exceeds all thresholds. Concrete breaking, piling, demolition and heavy plant operation routinely hit 90 to 110 dB(A). Most construction sites require designated hearing protection zones with mandatory signage at access points. For sector-specific guidance, explore our range of construction site signs.
Press shops, CNC machinery, metal fabrication and packaging lines often produce sustained noise between 85 and 95 dB(A). Permanent mandatory signs are standard at workshop entrances and around individual machines. For more on creating these zones, see what is a noise protection zone and how do you sign it.
Live music venues, nightclubs and festival stages generate extreme peak levels, often exceeding 100 dB(A). Temporary mandatory signage is essential for crew areas, backstage zones and prolonged exposure locations.
Forklifts, conveyor systems and loading bays typically produce 75 to 85 dB(A). Many warehouses sit on the borderline, requiring careful assessment and targeted signage in specific zones rather than site-wide coverage.
You cannot make informed decisions about signage without reliable noise measurements. Here is a practical approach to assessment.
Use Proper Equipment
Personal noise dosimeters or sound level meters calibrated to UK standards are essential. Smartphone apps are not sufficiently accurate for compliance purposes. The HSE website provides guidance on measurement methods and approved equipment.
Measure Throughout the Working Day
Noise levels vary with activity. Measure during typical operations, peak production, and when multiple machines run simultaneously. Account for shift patterns and different tasks.
Consider Peak Exposure
Daily average exposure tells only part of the story. Impact tools, drop forging and explosive actuated tools create brief but intense peaks that require separate assessment.
Document Everything
Your noise assessment must be written, dated and reviewed regularly (at least every two years or when work patterns change). Record measurements, identify affected workers, and note control measures including signage locations.
Seek Professional Help if Needed
Complex sites or borderline measurements benefit from professional noise surveys. Competent acousticians provide detailed reports and recommendations that stand up to HSE scrutiny. For further reading on timing, see when you need noise hazard signs on a worksite.
Once you know signage is required, selecting appropriate materials and positioning them correctly ensures effectiveness and compliance.
Indoor environments allow lighter materials like rigid PVC. Outdoor or harsh environments demand weatherproof rigid plastic or aluminium composite with UV-resistant inks. For detailed material guidance, see our signs.
Mount signs at eye level (1.5 to 2 metres) at every entrance to hearing protection zones. Ensure clear sightlines from approach routes, and add reflective or photoluminescent options for low-light areas.
All signage must meet ISO 7010 or BS EN ISO 7010 standards. The symbol, colours and proportions are legally defined. Non-compliant homemade signs do not meet regulatory requirements.
Use this checklist to ensure you have met all obligations around workplace noise and warning signage:
If you are uncertain about any step, we are here to help. With over two decades manufacturing safety signage for UK businesses, we understand compliance challenges and practical solutions. Learn more about us and how we support businesses like yours.
The noise thresholds are clear: 80 dB for awareness, 85 dB for mandatory protection, and 87 dB as an absolute limit. Measure your workplace properly, assess the risks honestly, and install compliant signage where it is needed.
If you need help selecting the right signs, specifying materials or understanding placement requirements, contact us for practical guidance. Our straightforward returns policy means you can order with confidence, and our same-day dispatch ensures you get compliant signage quickly when you need it.
Protect your team, meet your legal obligations, and demonstrate genuine commitment to workplace safety. The right signage, in the right place, at the right time makes all the difference.
