When a Noise Assessment Needs a Hand-Arm Vibration Companion (and When It Doesn't)

If your workers operate angle grinders, breakers, sanders, or pneumatic drills, the noise assessment is probably catching them — but the noise assessment alone might be missing half the risk. The same hand tools that produce noise above the action values often produce hand-transmitted vibration above its own action values. The two are governed by separate regulations, with different thresholds, different units, and different controls.

This guide covers how to spot when a noise assessment needs a hand-arm vibration companion, when it doesn't, and how to scope each so neither becomes a token addition to the other.

This guide focuses on the noise side of the workflow and covers vibration only as a co-occurring hazard. For a comprehensive vibration assessment, the methodology in HSE's hand-arm vibration guidance applies — this guide is not a substitute. Where exposure is borderline or vibration drives the risk, get input from a competent occupational hygienist on the vibration side specifically.

The two regulations and why they don't merge cleanly

Noise at work is governed by the Control of Noise at Work Regulations 2005. Vibration is governed by the Control of Vibration at Work Regulations 2005. They were laid before Parliament in the same year and follow a similar structure, but the substance differs in ways that matter.

	Noise (CoNAWR 2005)	Hand-arm vibration (CoVAWR 2005)
Daily exposure metric	LEP,d in dB(A)	A(8) in m/s²
Lower exposure action value	80 dB(A)	2.5 m/s² A(8)
Upper exposure action value	85 dB(A)	5 m/s² A(8)
Exposure limit value	87 dB(A)	(none for hand-arm)
Health surveillance trigger	At/above 85 dB(A)	At/above 2.5 m/s² A(8)
Risk addressed	Hearing damage	Vibration White Finger / HAVS

The two cannot be merged into a single number. Noise exposure depends on the sound power emitted by the tool and process; hand-arm vibration exposure depends on the vibration magnitude transmitted to the operator's hands. A muffled but heavily-vibrating tool can be a hand-arm vibration risk without being a noise risk; a process that's noisy at distance (machine-mounted blowers, large compressors) can be a noise risk without producing significant hand-arm vibration.

When the two co-occur — the trades and tools

The overlap is concentrated in trades that involve hand-held powered tools applied to hard substrates. The classic co-occurrence patterns:

Construction:

• Concrete breaking with hydraulic or pneumatic breakers
• Angle grinding, cutting, and chasing
• Hand-held drilling into masonry
• Compaction with hand-guided plate compactors
• Vibratory poker work and concrete consolidation

Manufacturing and fabrication:

• Die grinding, deburring, and finishing
• Hand-held welding preparation (grinding, cleaning)
• Sanding and surface preparation
• Riveting and impact wrench operation

Joinery and woodworking:

• Hand-held planing and sanding
• Routing and edge profiling
• Chainsaw operation (also a noise-primary risk)

Vehicle repair and maintenance:

• Air-impact tool use
• Grinding and cutting bodywork or chassis
• Pneumatic chisel operation

In these workflows, the worker holding the tool is exposed to both hazards simultaneously. A noise assessment that captures the LEP,d but ignores the A(8) leaves the vibration duty unmet — and vice versa.

When noise assessment is enough on its own

The two-regulation overlap is real but it is not universal. Many noise-exposed workplaces have negligible hand-arm vibration risk:

• Static noise sources: workshops where noise comes from compressors, extraction fans, machinery enclosures, or fixed plant — workers near the noise are not gripping a vibrating tool
• Process noise without hand contact: food processing lines, printing presses, packaging machinery — workers monitor or feed but do not hand-hold vibrating equipment
• Rotating machinery operation: lathe and milling machine operators — the machine vibrates, but the operator interacts with controls rather than gripping a vibrating tool
• Pure-product noise: live music venues, motor sports, transport hubs — noise without significant hand-tool involvement

If your noise risk assessment workflow is entirely in one of these categories, the vibration question is normally a one-line negative finding rather than a separate assessment. The decision tree is straightforward: do any workers regularly grip powered hand tools? If no, the vibration assessment is a documented "not applicable" finding. If yes, even occasionally, a vibration assessment is required alongside the noise assessment.

How to scope each assessment when both are needed

The methodology is parallel, not combined. Two assessments, run separately, with the outputs filed together as part of the worker's exposure record.

Noise side:

• Identify noise sources and exposed workers (static and tool-driven)
• Estimate or measure exposure as LEP,d
• Compare against the 80 / 85 / 87 dB(A) action and limit values
• Implement controls following the noise hierarchy (see Noise Control Measures: The UK Hierarchy)
• Action plan, hearing protection issue, audiometric surveillance for those at/above 85 dB(A)

For step-by-step guidance on the noise assessment process, see How to Complete a Noise Risk Assessment. For evaluating template adequacy, What to Look for in a Noise Risk Assessment Template.

Hand-arm vibration side:

• Identify hand-held vibrating tools and the workers using them
• Estimate or measure exposure as A(8) — typically using manufacturer-declared vibration emission values plus realistic trigger time, or a vibration meter survey for borderline cases
• Compare against the 2.5 / 5 m/s² A(8) action and limit values
• Implement controls (tool selection for lower vibration emission, trigger-time limits, anti-vibration tool grips, rotation between tasks)
• Health surveillance for workers at/above 2.5 m/s² A(8) — symptom questionnaires plus tier-2 medical examinations for those reporting symptoms

The two assessments share an inventory step (which tools, used by which workers, for how long) but produce different exposure figures and different action plans.

Where the assessments interact

Even though the calculations are separate, several decisions feed across:

Tool selection: Replacing a high-noise/high-vibration tool with a quieter and lower-vibration alternative addresses both regulations at once. Procurement specifications should include both vibration and noise emission limits, not just one.

Trigger time limits: The most powerful administrative control for hand-arm vibration is limiting trigger time per worker per shift. The same control reduces noise exposure if the tool is also a noise-action-value contributor — a single rotation rule can address both duties.

Worker rotation: Rotating workers between tool-using and other tasks reduces both vibration and noise exposure simultaneously. The schedule needs to be sized to whichever exposure drives the more demanding limit.

Health surveillance scheduling: Audiometric surveillance (noise) and HAVS symptom screening (vibration) can be scheduled together for workers exposed to both, reducing the administrative load. The clinical content differs but the appointment cadence can align.

Records: Keep noise and vibration exposure records together in the worker's safety file — separate sections, single file. An inspector reviewing one will inevitably ask about the other if the work involves hand-held tools.

For a sector-specific worked structure that includes both, the Noise and Vibration Risk Assessment Template covers the additional sections a combined template needs for construction and manufacturing settings.

Common mistakes when both apply

• Treating one assessment as covering the other — the two have different metrics, thresholds, and controls. A noise assessment is not a vibration assessment, even when the same tool drives both.
• Using "averaging" assumptions to ignore vibration — daily vibration exposure is concentrated in trigger time, not spread across the working day. Workers using a tool for two hours of an eight-hour shift can still exceed the upper exposure action value if the tool's emission is high.
• Missing the procurement window — when buying replacement tools, specifying only noise emission misses the chance to control vibration at the same time. Both are declared by manufacturers.
• Applying noise hearing protection as a vibration control — hearing protection does nothing for vibration. Vibration controls are tool-side, time-side, or technique-side; PPE is not a vibration control in any meaningful sense.
• Filing separate assessments under separate management trees — if the noise records are with HR/H&S and the vibration records are with operations or fleet, the worker exposure record is fragmented. Consolidate.

Frequently asked questions

How is hand-arm vibration measured?

Hand-arm vibration exposure is expressed as A(8) in m/s² — an 8-hour energy-equivalent vibration magnitude weighted to the frequency response that causes vascular and neurological damage. Manufacturers must declare vibration emission values for tools under the Supply of Machinery (Safety) Regulations 2008; A(8) is calculated by combining declared emission with realistic trigger time. For borderline exposures or when manufacturer data is unreliable, a vibration meter survey produces direct measurements.

What are the symptoms of HAVS?

Hand-arm vibration syndrome typically presents as one or more of: episodic finger blanching (vibration white finger), tingling or numbness in fingers, reduced grip strength, and pain or discomfort in hands and arms. Symptoms develop gradually over months or years of exposure and become progressively harder to reverse. Health surveillance for at-risk workers exists specifically to catch early-stage symptoms before damage is permanent.

What is the EAV for vibration?

The Exposure Action Value for hand-arm vibration is 2.5 m/s² A(8). Above this level, the regulations require employers to assess risk, implement controls, and provide health surveillance. The Exposure Limit Value is 5 m/s² A(8) — exposure above this level should not occur, except in exceptional and documented circumstances.

When in doubt — assess separately

The cost of running both assessments where only one was needed is small. The cost of running only the noise assessment where both were needed is real — under-protected workers, an unmet regulatory duty, and a compliance gap an inspector or insurer is likely to identify. If your workflow involves any regular hand-tool use on hard substrates, treat the vibration assessment as required until you have written evidence that exposure is below 2.5 m/s² A(8).

For the regulatory framework underpinning the noise side, see UK Noise at Work Regulations: The Complete Employer Guide. For the action values and what each threshold triggers, UK Workplace Noise Exposure Limits covers the noise thresholds in detail.

Sources

• The Control of Noise at Work Regulations 2005 — legislation.gov.uk
• The Control of Vibration at Work Regulations 2005 — legislation.gov.uk
• Hand-arm vibration at work — HSE
• The Control of Vibration at Work Regulations 2005 — HSE guidance
• Construction physical ill-health risks: Noise — HSE
• L108: Controlling Noise at Work (3rd edition, 2021) — HSE