Skip to main content

UK Safety Signs Knowledge Hub

Noise warning signs UK

When the Noise at Work Regulations require Hearing Protection Zones, what the signs must show, and how to size them.

By Direct Signs Team · ISO 9001 certified UK manufacturer · Updated May 2026

The short answer

UK noise warning signage is required wherever workplace noise exceeds 85 dB(A) daily exposure or 137 dB(C) peak under the Control of Noise at Work Regulations 2005. Areas above these thresholds become Hearing Protection Zones, which must be identified by BS EN ISO 7010 M003 (wear ear protection) mandatory signs at every entry point. Best practice: display the measured dB level and "must be worn beyond this point" wording.

The legal framework

The Control of Noise at Work Regulations 2005 set two exposure action values:

  • Lower action value — 80 dB(A) daily exposure (LEX,8h) or 135 dB(C) peak. Hearing protection must be made available; information and training required.
  • Upper action value — 85 dB(A) daily or 137 dB(C) peak. Designated Hearing Protection Zones required, with mandatory signage and enforced PPE use.
  • Exposure limit value — 87 dB(A) daily or 140 dB(C) peak. Even with hearing protection, this limit must not be exceeded at the ear.

Where a noise risk assessment confirms that workers are exposed above 85 dB(A) daily, the area must be designated, signed, and access controlled — with hearing protection enforced.

What a Hearing Protection Zone sign must show

  • M003 Wear ear protection — mandatory blue circle with ear-protector pictogram
  • "Hearing Protection Zone" identification
  • "Hearing protection must be worn beyond this point" — explicit instruction
  • Measured noise level (best practice) — e.g. "Noise level 92 dB(A)"
  • Specific PPE recommendation (best practice) — minimum SNR rating

Sign sizing for noise zones

Standard 1-in-200 viewing rule applies. Common sizes:

  • 200×300mm — single-door entry, close approach
  • 300×400mm — corridor or aisle approach (3-5m)
  • 400×600mm — large factory floor entry, 5-10m approach
  • 600×900mm — outdoor industrial sites, distant approach

Sector-specific applications

Manufacturing: machine shops, presses, drop forges, foundries. Hearing protection zones often cover entire production halls. Combined with PPE entry stations.

Construction: piling, breaking, sawing, and demolition zones. Signage often portable or temporary as zones move with the work.

Energy/utilities: compressors, gas turbines, transformer halls, pump stations.

Defence and shooting ranges: peak-impulse environments. Signage emphasises peak hazard and SNR 30+ requirement.

Agricultural: grain dryers, milking parlours, chainsaw operations. Noise zones can be temporary (during operation only).

Entertainment venues: concert halls, nightclubs. Patron-facing noise warnings differ from worker-facing — both increasingly common in UK practice.

Combined hearing protection + other PPE signs

Many noise zones also require additional PPE. Combined PPE sign sets are common:

  • M003 (ear) + M004 (eye) — workshops, machine shops
  • M003 + M014 (hard hat) + M008 (footwear) — construction, demolition
  • M003 + M016 (mask) + M009 (gloves) — chemical processing, paint shops
  • M003 + M015 (hi-vis) — outdoor industrial sites

A combined sign saves wall space and presents a single clear instruction at zone entry.

Zone exit signage

Best practice — and required by some company standards — is a "leaving hearing protection zone" sign at exit. This signals workers that they may safely remove ear protection and reinforces zone boundaries when shifts change or visitors leave.

Materials for noise warning signage

  • Rigid PVC — most factory and workshop indoor mounting
  • Aluminium composite — outdoor industrial, harsh environments
  • Stainless steel / photopolymer — clean rooms, food processing
  • Self-adhesive vinyl — temporary or portable zones (construction)
  • Magnetic / sliding insert signs — for zones that activate intermittently (shooting ranges, event venues)

Browse noise warning signage

Quick answers

Noise warning sign FAQs

When are noise warning signs required?
The Control of Noise at Work Regulations 2005 set two action values: lower exposure action value (80 dB(A) daily exposure or 135 dB(C) peak) requires hearing protection to be made available; upper exposure action value (85 dB(A) daily or 137 dB(C) peak) requires designated Hearing Protection Zones with mandatory signage and enforced PPE. So: signage is mandatory above 85 dB(A).

What does a hearing protection zone sign look like?
A combination of two BS EN ISO 7010 signs: M003 "Wear ear protection" (mandatory blue circle with ear-protector pictogram) and a Hearing Protection Zone identification panel. Often supplemented with the actual measured noise level (e.g. "Noise level 92 dB(A)") and "Hearing protection must be worn beyond this point". At zone exit, a "leaving hearing protection zone" sign is best practice.

How do we know our noise level requires signage?
A workplace noise risk assessment under Regulation 5 of the Noise Regulations 2005. Conducted by a competent person using a calibrated sound level meter or dosimeter. Measures daily exposure (LEX,8h) at every working position. If any worker's daily exposure exceeds 85 dB(A) — or peak exceeds 137 dB(C) — that area becomes a Hearing Protection Zone requiring signage.

Do we need to display the actual dB level?
Not legally required, but strongly recommended best practice. Displaying the measured level (e.g. "Noise level 92 dB(A)") helps workers understand the risk and select appropriate hearing protection (different ear defenders have different SNR ratings). It also signals to visitors and contractors that the area is genuinely hazardous, not just precautionary.

What about peak/impulse noise?
Peak action values target sudden loud impulses — gunshots, hydraulic releases, drop forging, riveting. Above 137 dB(C) peak, signage is mandatory even if average daily exposure is lower. These environments often need higher-spec hearing protection (SNR 30+) and reduced shift duration. Signage typically reads "Impulse noise hazard — hearing protection mandatory".

Where should noise zone signs be placed?
At every entry point to the zone — doorways, passageways, stair tops if the zone is a whole floor. The sign must be visible before the worker enters. For large open zones (factory floors, concert venues, shooting ranges), boundary signs at every approach. Where the zone is intermittent (only during specific operations), signs may be portable or use removable inserts to indicate "active" status.

What materials are best for noise zone signs?
Most factory and workshop signage is rigid PVC or aluminium composite for permanence. For agricultural and outdoor temporary zones (harvesting, construction blasting), self-adhesive vinyl on temporary boards. For clean-room or food-processing environments where wash-down is required, stainless steel or photopolymer. For shooting ranges and event venues with fluctuating activity, magnetic or sliding-insert signs that can show "active" or "clear".

Hearing protection zone signage

BS EN ISO 7010 M003 stock signs, plus bespoke noise zone signage with your measured dB level and PPE specification. Manufactured in 3-5 working days.

Get a project quote Browse the shop