Noise at Work Regulations
Quick Answer: The Control of Noise at Work Regulations 2005 (SI 2005/1643) set three thresholds: lower exposure action value at 80 dB(A) daily average (provide information and make hearing protection available), upper exposure action value at 85 dB(A) (mandatory hearing protection zones, engineering controls required first), and an exposure limit value of 87 dB(A) which must not be exceeded even accounting for hearing protection. Common construction tools routinely exceed 95 dB(A) — an angle grinder can push a worker above the upper action value daily dose in under 25 minutes. Noise-induced hearing loss is permanent.
Summary
Noise-induced hearing loss (NIHL) is one of the most widespread occupational diseases in UK construction, and one of the most preventable. It develops silently over years of repeated exposure. By the time a worker notices they are asking colleagues to repeat themselves or needs the television turned up beyond what others find comfortable, a significant and permanent proportion of their hearing is already gone. There is no treatment. Damaged hair cells in the cochlea do not regenerate.
Construction and the trades are among the highest-risk sectors in the UK for NIHL. Angle grinders, disc cutters, SDS rotary hammers, nail guns, and circular saws all produce noise levels that, without engineering controls or hearing protection, expose workers to doses well above the legal thresholds within minutes rather than hours. A disc cutter operating at 110 dB(A) can push a worker above the upper action value daily dose equivalent in less than two minutes. This is not a marginal risk — it is one of the most acute and routine hazards across the construction trades.
The Control of Noise at Work Regulations 2005 replaced the earlier Noise at Work Regulations 1989 and implement the EU Physical Agents (Noise) Directive 2003/10/EC. They require employers to assess noise exposure, reduce it through engineering controls before relying on hearing protection, establish mandatory hearing protection zones at the upper action value, and arrange health surveillance for workers regularly exposed. For self-employed tradespeople, the same duties apply to themselves.
Key Facts
- Legal framework — Control of Noise at Work Regulations 2005 (SI 2005/1643); in force 6 April 2006 (construction and agriculture: 6 April 2008)
- Lower Exposure Action Value (LEAV) — 80 dB(A) daily personal noise exposure (LEP,d) and 135 dB(C) peak sound pressure
- Upper Exposure Action Value (UEAV) — 85 dB(A) LEP,d and 137 dB(C) peak sound pressure
- Exposure Limit Value (ELV) — 87 dB(A) LEP,d and 140 dB(C) peak; must not be exceeded, taking into account hearing protection attenuation
- dB(A) — A-weighted decibels; filters to reflect how the human ear responds to different frequencies; standard unit for occupational noise exposure
- dB(C) — C-weighted decibels; used for peak pressure measurements (nail guns, cartridge tools, explosives)
- LEP,d — daily personal noise exposure; accounts for both level and duration across the working day
- Noise is logarithmic — every 3 dB increase doubles the noise dose; 88 dB(A) for 4 hours equals the same daily dose as 85 dB(A) for 8 hours
- SNR (Single Number Rating) — headline attenuation value on hearing protection packaging; overestimates real-world protection by 4–8 dB in use
- NIHL — sensorineural hearing loss; predominantly affects 4 kHz range first; causes difficulty hearing speech clearly; irreversible
- Tinnitus — ringing, buzzing, or hissing in the ears; frequently accompanies NIHL; also permanent in most cases
- Audiometry — calibrated hearing test required for health surveillance under Regulation 9
- Health surveillance records — must be kept for 40 years from the date of the last entry
- Engineering controls first — the Regulations explicitly require reduction at source before hearing protection can be relied upon as a primary control
Quick Reference Table
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|---|---|---|
| Nail gun (powder-actuated) | 140 dB(C) peak | Single shot risk |
| SDS rotary hammer drill | 100–110 dB(A) | Under 1 minute |
| Disc cutter / cut-off saw | 100–115 dB(A) | 1–8 minutes |
| Angle grinder | 95–100 dB(A) | 8–25 minutes |
| Circular saw | 95–105 dB(A) | 8–25 minutes |
| Reciprocating saw | 95–105 dB(A) | 8–25 minutes |
| Belt sander | 93–97 dB(A) | 15–45 minutes |
| Heavy plant (at operator position) | 80–90 dB(A) | Background; may contribute to dose |
| Normal conversation | 60–65 dB(A) | No occupational risk |
Approximate figures based on HSE noise data and manufacturer declarations. Actual levels vary by tool condition, material, and working distance.
Detailed Guidance
Understanding Daily Personal Noise Exposure (LEP,d)
The LEP,d is not the loudest sound encountered during a shift — it is the energy-averaged exposure across the full 8-hour working day. Because the decibel scale is logarithmic, brief exposures at very high levels contribute disproportionately to the daily total:
- A disc cutter at 110 dB(A) used for 15 minutes contributes approximately 97 dB(A) to the daily LEP,d
- The same tool used for 4 hours contributes approximately 107 dB(A)
- A worker doing 15 minutes of disc cutting and otherwise working in an 80 dB(A) environment can still exceed the 85 dB(A) upper action value for the day
The practical implication is that short bursts of very high noise are not trivially managed by limiting tool use time. An angle grinder used for 25 minutes can exceed the upper action value for the full day. The HSE provides a free Noise Exposure Calculator on its website for estimating combined daily exposure from multiple tools and tasks.
Three Action Levels: What Each Requires
At or above the lower exposure action value (80 dB(A) / 135 dB(C) peak):
- Carry out a noise risk assessment under Regulation 5
- Provide information and training to exposed workers about the noise risks, the legal thresholds, and how to use hearing protection correctly
- Make hearing protection available on request (not yet mandatory)
- Arrange health surveillance (audiometry) for workers regularly exposed at or above this level
At or above the upper exposure action value (85 dB(A) / 137 dB(C) peak):
- Designate and sign mandatory hearing protection zones; anyone entering the zone must wear hearing protection
- Ensure hearing protection is worn — it is no longer voluntary
- Introduce engineering controls to reduce noise before relying on hearing protection
- Ensure hearing protection provided is adequate for the noise level present
- Arrange health surveillance (audiometry) for all regularly exposed workers; annual tests for those at or above this level
At or above the exposure limit value (87 dB(A) / 140 dB(C) peak):
- Workers must not be exposed above this level; the ELV takes into account the attenuation of hearing protection worn
- If the ELV is reached or exceeded despite controls, work must stop and the noise exposure must be reduced before continuing
- This is an absolute limit — there are no circumstances under which exceeding it is permissible
Engineering Controls: First Line of Defence
The Regulations explicitly require employers to reduce noise at source through engineering controls before relying on hearing protection. Hearing protection is a supplementary measure, not a substitute for engineering controls. Controls to consider:
Quieter tool selection — where a genuine choice exists, select the quieter tool. Battery-powered equivalents of petrol tools are generally quieter. Manufacturers must declare the sound power level (LWA) under the Machinery Directive, making comparison possible. Some disc cutters are measurably quieter than others for comparable cutting performance.
Blade and bit condition — blunt or worn blades produce more noise and vibration than sharp ones. Regular blade replacement and correct blade selection for the material being cut reduces noise output meaningfully.
Distance from noise source — noise drops approximately 6 dB for every doubling of distance. Where possible, position workers away from fixed noise sources such as generators and compressors. A 3-metre distance reduces exposure by approximately 10 dB compared to 1 metre.
Acoustic enclosures and mufflers — compressors and generators can be fitted with acoustic housings or exhaust silencers, reducing noise at source by 10–15 dB. Less applicable to handheld tools but relevant for fixed plant.
Enclosure and absorption in workshops — sound-absorbing panels on walls and ceilings, acoustic screens around noisy fixed machinery, and rubber anti-vibration mounts for machinery can reduce ambient workshop levels by 5–10 dB.
Reduced exposure time through task rotation — rotating workers between noisy and quieter tasks limits individual daily dose. Scheduling noisy tasks to avoid multiple noisy operations running simultaneously reduces overall site ambient levels.
Hearing Protection: Selection Using SNR Ratings
Hearing protection is selected based on the level of noise reduction required to bring exposure below the ELV. The SNR (Single Number Rating) on the packaging overestimates real-world protection. The HSE recommends derating SNR values by 4 dB for practical selection (the "4 dB subtraction" method):
Simple SNR selection calculation: Protected exposure = noise level − (SNR − 4)
Example: Noise level 100 dB(A), hearing protection SNR 28. Estimated protected level = 100 − (28 − 4) = 76 dB(A). Well below the ELV of 87 dB(A), and at a safe level without over-protecting.
Target protected level: Aim to reduce exposure at the ear to between 70 and 80 dB(A). Reducing below 70 dB(A) is over-protection — workers cannot hear hazard warnings or speech, increasing the risk of accidents.
Common types for construction:
- Disposable foam earplugs (SNR 30–37 dB) — highest attenuation per unit cost; must be rolled and inserted correctly to achieve rated performance; suitable for continuous high-noise tasks such as disc cutting
- Banded reusable earplugs (SNR 18–26 dB) — worn on a band around the neck; convenient for intermittent use; quick to put on and remove; lower attenuation than foam disposables
- Earmuffs (SNR 26–35 dB) — cup over the ear; effective for continuous wear; must seal against the head — glasses frames, facial hair, and some hat brims reduce the seal and reduce effective attenuation significantly
- Level-dependent earmuffs — electronic protection that allows normal ambient sound and speech at safe levels but attenuates loud impulses automatically; suitable for tasks with intermittent peak noise such as nail guns or pneumatic tools
Combining earplugs and earmuffs together adds approximately 5 dB of additional protection — not double the protection of either alone.
Hearing Protection Zones
Where the UEAV (85 dB(A)) is regularly exceeded, employers must designate mandatory hearing protection zones. Requirements:
- Signage — zone entry signs must comply with the Safety Signs and Signals Regulations 1996: yellow triangular warning sign with a hearing protection pictogram
- Mandatory wearing — anyone entering the zone must wear adequate hearing protection, regardless of how briefly they enter
- Defined boundaries — the zone must have clear physical or marked boundaries; "near the disc cutter" is not a defined zone
On construction sites, this is typically managed by designating specific areas (plant areas, cutting stations) as permanent zones, and using mobile signs when noisy tasks move around the site during the day.
Health Surveillance: Audiometry
Regulation 9 requires health surveillance for workers regularly exposed at or above the lower action value (80 dB(A)). Health surveillance means audiometric testing — a calibrated hearing test that detects changes in hearing ability at the frequencies most affected by noise (3–6 kHz, with 4 kHz typically first).
Audiometry programme requirements:
- Baseline test before or at the start of noise exposure (or within 6 months for existing workers)
- Annual repeat for workers exposed regularly at or above the UEAV (85 dB(A))
- Three-yearly repeat for workers exposed regularly between the LEAV and UEAV
- Carried out by a competent person (occupational health nurse or audiologist)
- Results assessed for standard threshold shift — a shift of 10 dB or more at 3, 4, or 6 kHz indicates early NIHL and requires referral
Where early NIHL is detected, the worker must be informed, referred to an occupational physician, and noise controls must be reviewed. Continuing the worker in the same conditions is not acceptable.
Health surveillance records must be retained for 40 years from the date of the last entry. NIHL develops over a working lifetime and records from early in a career may be material evidence in a compensation claim made decades later.
The Noise Risk Assessment
A noise risk assessment under Regulation 5 must identify noise sources; estimate or measure noise levels at workers' positions; calculate or estimate daily and weekly LEP,d for each exposed worker; identify those at risk; record engineering controls in place and their effectiveness; identify additional controls needed; confirm hearing protection selected is adequate; and identify health surveillance requirements.
The assessment must be reviewed when circumstances change (new tools, new tasks, new workers or working patterns), when there is reason to believe it is no longer valid, or when health surveillance results indicate NIHL is occurring.
Noise assessments should be carried out by, or reviewed by, a competent person — ideally someone with occupational hygiene training and experience with calibrated sound level measurement.
Frequently Asked Questions
Does wearing any ear protection mean I'm legally compliant?
No. The hearing protection must be adequate for the specific noise level, worn correctly for the full duration of exposure, and maintained in serviceable condition. An SNR 28 dB earplug worn in a 110 dB(A) disc-cutting environment, inserted only partially, provides far less than rated protection. Compliance requires: correct selection (adequate SNR for the noise level), correct fitting, consistent wearing, and regular maintenance or replacement.
Do the Regulations apply when working in a customer's home?
Yes. The Regulations apply wherever an employer causes workers to be exposed to noise, and self-employed tradespeople owe a duty to themselves. Working in a domestic property does not reduce the legal obligation. If disc cutting in a domestic kitchen for more than a few minutes, adequate hearing protection and noise controls apply regardless of the location.
What is the difference between dB(A) and dB(C)?
dB(A) is A-weighted — it filters across the frequency range to reflect how the ear responds during prolonged exposure. It is the unit used for daily exposure thresholds. dB(C) is C-weighted, less filtered at low frequencies, and used for peak measurements — single loud events such as a nail gun shot, where the ear's peak damage response differs from its average response. Always match the measurement type to the correct threshold.
Can music-playing ear defenders be used as hearing protection?
Only if they provide an adequate SNR for the noise environment and that SNR can be verified. Some specialised ear defenders incorporate audio with a declared and maintained attenuation rating. Standard consumer earbuds or headphones do not have a declared SNR and cannot be treated as hearing protection under the Regulations. If workers are using earbuds to block out noise, they should be provided with proper rated hearing protection instead.
How do I set up a hearing protection zone on a small site?
Post a yellow triangle hearing protection sign at entry points to the zone. If the zone location changes with the task — for example, disc cutting in different rooms over the course of a day — the sign moves with the task and the zone is wherever the noisy work is happening. Brief all workers on site that the zone requires hearing protection and ensure adequate supplies are available for anyone who may enter.
Regulations & Standards
Control of Noise at Work Regulations 2005 (SI 2005/1643) — primary legislation; Regulation 5 (noise risk assessment), Regulation 6 (eliminate or control exposure), Regulation 7 (hearing protection), Regulation 8 (hearing protection zones), Regulation 9 (health surveillance), Regulation 10 (information and training)
L108 — Controlling Noise at Work — HSE approved code of practice and guidance; describes legal requirements and practical compliance approaches
HSG260 — A Guide to Audiometric Testing Programmes — HSE guidance on establishing and running health surveillance for noise-exposed workers
Safety Signs and Signals Regulations 1996 (SI 1996/341) — governs the format of hearing protection zone signage
BS EN ISO 9612 — determination of occupational noise exposure; engineering method for measurement
BS EN 352 series — European standards for earmuffs, earplugs, and level-dependent protection; basis for SNR declarations
Machinery Directive (2006/42/EC) and UK equivalent — requires manufacturers to declare sound power level (LWA) for machinery above 70 dB(A)
PPE selection guide — hearing protection selection, SNR ratings, correct fitting of earplugs and earmuffs for construction environments
hand-arm vibration syndrome (HAVS) — vibrating tools that produce high noise also cause HAVS; the Regulations require parallel assessments for both hazards
COSHH regulations for tradespeople — tools generating high noise commonly generate high dust simultaneously; both hazards require separate but complementary assessment