Noise can sneak up on a workplace quietly until it becomes a problem. A noise assessment isn’t just a tick-box exercise; it’s a legal and practical safeguard for your people and your business. If machinery hums, tools whir, or operations echo through your site, it’s time to ask: how often should a noise assessment be performed?

At Gradwell Group, we specialise in creating safe, compliant environments through expert workplace noise surveys. Let’s explore when, why, and how often these assessments should happen and how regular checks can protect hearing, health, and productivity.

Why Do Noise Assessments Matter?

Excessive workplace noise doesn’t just irritate it damages. According to the Health and Safety Executive (HSE), over one million UK workers are exposed to harmful noise levels every day. Prolonged exposure above 85 dB(A) can cause permanent hearing loss and tinnitus. 

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A professional noise assessment measures exposure levels, identifies risk areas, and recommends practical controls to keep your business compliant with The Control of Noise at Work Regulations 2005.

How Often Should a Noise Assessment Be Performed?

The law doesn’t specify an exact time frame instead, it requires employers to review their noise risk assessments whenever conditions change. In other words, frequency depends on your workplace activities, machinery, and environment.

Still, as a guide, many organisations follow these best-practice intervals:

• Annual reviews of your current noise assessment to ensure controls remain effective
  
  
• Full reassessments every 2–3 years in steady, low-risk environments
  
  
• Immediate reassessment after significant operational or equipment changes
  
  
• Frequent reassessments (every 12 months) for high-risk industries such as manufacturing, construction, or heavy engineering
  
  

Tip: Don’t wait for hearing issues to surface prevention is always cheaper than cure.

When Should You Re-Assess?

Sometimes, you shouldn’t wait for your scheduled review. A new noise assessment should be carried out whenever:

• New machinery or tools are introduced
  
  
• Production processes or layouts change
  
  
• Maintenance alters the noise output of existing equipment
  
  
• Shift patterns or staff roles change exposure times
  
  
• Employee hearing tests show early signs of hearing loss
  
  

These triggers indicate your previous data may no longer reflect current risks and reassessment ensures you stay compliant and proactive.

Legal Guidance in the UK

Under the Control of Noise at Work Regulations 2005, employers must:

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• Assess the risk of noise exposure
  
  
• Take action to reduce harmful levels
  
  
• Provide hearing protection when required
  
  
• Monitor and review noise assessments when things change

Failing to reassess can lead to HSE enforcement action, fines, or even personal injury claims if workers suffer preventable hearing loss.

The Real Cost of Ignoring Noise

Ignoring or delaying a noise assessment can lead to:

• Reduced staff productivity (noise fatigue affects focus)
  
  
• Increased sickness absence due to hearing issues
  
  
• Compensation claims from preventable hearing loss
  
  
• Non-compliance penalties from regulators
  
  

In 2023, the HSE estimated that £135 million per year is lost due to work-related hearing damage. A small investment in regular noise assessments can save thousands and protect lives.

How Gradwell Group Helps?

At Gradwell Group, we make compliance simple. Our experienced consultants offer:

• Comprehensive workplace noise surveys
  
  
• Personal exposure measurements using HSE-approved methods
  
  
• Clear reporting and action plans for compliance
  
  
• Ongoing monitoring and reviews tailored to your business
  
  
• Integration with wider environmental and acoustic services
  
  

Explore our Acoustic Services to learn how we support businesses across construction, manufacturing, logistics, and more. With our expert team, you’ll never miss a reassessment date or risk failing an HSE inspection.

FAQs

1. How often do I need to carry out a noise assessment?

 Typically, every 2–3 years, or sooner if there’s a change in processes or machinery.

2. Who can perform a workplace noise assessment?

 A competent acoustic consultant or trained health and safety professional with the right equipment and experience.

3. What happens during a noise assessment?

 Specialist equipment measures sound levels across work areas, followed by a detailed report and action plan.

4. Is a noise assessment legally required?

 Yes, if noise levels reach the lower exposure action value of 80 dB(A) or higher.

5. How long does a noise assessment take?

 Most assessments take a few hours to a full day, depending on the site size and operations.

Conclusion

A noise assessment isn’t just a compliance formality it’s a cornerstone of employee wellbeing and operational excellence. Regular reviews prevent hearing damage, protect your reputation, and demonstrate your commitment to safety.

At Gradwell Group, we provide trusted, efficient, and professional noise assessments tailored to your workplace needs. Stay ahead of HSE expectations and keep your workforce safe.

Ready to book your next noise assessment?
Visit our Contact Page or speak with one of our experts today.