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NOVA Acoustics

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Acoustic Glossary

A-Z list of terminology commonly used within acoustics.

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Acoustic Symbols
A-Z list of symbols commonly used within acoustics.
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Acoustic Standards

A list of British/International Standards and Guidance relevant to the Acoustics field.

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Acoustics Education

Learn about the top UK Institutions offering Acoustics Education courses accredited by the IOA.

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BS8233:2014 is the British Standard used to assess whether residential development near roads, railways, or other noise sources can achieve acceptable internal and external noise levels for future occupants. It sets out criteria for bedrooms, living rooms, and gardens across daytime and night-time periods. The most commonly referenced targets are 35 dB LAeq during the day and 30 dB LAeq at night for bedrooms. A BS8233 assessment is almost always required for residential planning applications in noise-sensitive locations, and is often conditioned by the local planning authority. ProPG (2017) sits alongside BS8233 and provides professional guidance on how assessments should be scoped and presented. This guide covers both.

Office

Open plan office acoustics comes down to three things: controlling reverberation so speech is clear, managing background noise so people can concentrate, and achieving speech privacy so conversations do not travel. The key targets for open plan offices are a reverberation time (RT60) of 0.4 to 0.6 seconds, a background noise level of around 40 to 45 dB LAeq, and a Speech Transmission Index (STI) that limits intelligible speech to the immediate vicinity of the speaker. Achieving these consistently requires an integrated approach. Acoustic panels alone are rarely sufficient without also considering layout, screening, ventilation noise, and room geometry. This guide covers the principles, the targets, and the practical steps to get there.

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Part E of the Building Regulations sets minimum sound insulation standards for new residential buildings and dwellings created through material change of use. Compliance is demonstrated through pre-completion sound testing, an on-site acoustic measurement carried out before a building is occupied. The key performance targets are DnT,w + Ctr ≥ 45 dB for airborne sound (walls and floors between dwellings) and L'nT,w ≤ 45 dB for impact sound (floors). Achieving these figures consistently requires correct specification of the separating construction, attention to flanking paths, and quality workmanship throughout; selecting the right product is only one part of it.

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BS 4142 is the British Standard used to assess the impact of industrial and commercial noise on nearby sensitive premises. It works by comparing the rating level of a specific noise source (adjusted for acoustic character) against the prevailing background noise level at the nearest receptor. A difference of around +10 dB or more indicates a likely significant adverse impact. Around +5 dB indicates a likely adverse impact. At or below background indicates negligible impact. Most local planning authorities require a BS4142 assessment when new commercial or industrial premises are proposed near residential properties, or when fixed plant and equipment is being installed. The 2019 amendment (BS4142:2014+A1:2019) introduced important updates to methodology that all current assessments must reflect.

NIA Process

A noise impact assessment (NIA) is a technical report submitted as part of a planning application to demonstrate that a proposed development will not cause unacceptable noise. You will typically need one if your development is near a significant noise source (road, rail, or commercial premises), if it generates noise that could affect nearby residents, or if a planning authority has specifically requested one. NIAs are assessed against standards including BS4142, BS8233, and the NPPF. Without one, many planning applications are refused or delayed.

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Acoustic panels reduce echo, reverberation, and noise build-up within a room by absorbing sound. They do not block sound between rooms. The right panel depends on five things: the material (polyester fibre or fabric-wrapped), the thickness, how it will be mounted, the aesthetic requirements of the space, and whether durability or sustainability are priorities. Every panel in the Songbird range achieves Class A sound absorption (the highest performance rating available), so the choice between them comes down to application, environment, and finish rather than acoustic performance.

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When it comes to specifying which partition wall or floor design to choose for a project or which product supplier or specifiers data sheet to trust, there’s a lot of confusion and mis-application.​

Close-up of a worker using an angle grinder on metal, producing bright sparks, illustrating the importance of workplace noise risk assessments and compliance with the Control of Noise at Work Regulations 2005 by NOVA Acoustics.

How do I comply with the Noise at Work Regulations?
To comply with the Noise at Work Regulations, employers must assess noise exposure, reduce noise at source where reasonably practicable, manage remaining risk with organisational controls and hearing protection, train workers, keep records, and review assessments when conditions change.

Close up of a welding professional, illustrating the importance of workplace noise risk assessments and compliance with the Control of Noise at Work Regulations 2005 by NOVA Acoustics.

What does a workplace noise survey measure?
A workplace noise survey measures average noise exposure over time (dB(A)) and peak or impact noise (dB(C)) to determine whether workers exceed UK legal action values under the Control of Noise at Work Regulations.

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Do I need a noise at work risk assessment or a noise survey?
If workers may be exposed to harmful noise (around 80 dB(A) or above), UK law requires a noise at work risk assessment. If exposure cannot be confidently estimated, a noise survey with measurements is required to demonstrate compliance.

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In the UK, construction and infrastructure projects are often located in or near densely populated urban areas, where their environmental impact can be significant.

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Comprehensive Guide to Acoustic Wall Panels April 10, 2024 Effective

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Section 61 Noise Consent

We work with contractors to assess the suitability of any proposed on-site works and to provide guidance and support to reduce noise and vibration at the neighbouring receptors.

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As urban areas continue to expand and human activities thrive, environmental noise pollution has become a significant concern.

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Resilient bars allow secure fixing of plasterboard or other boards to timber joints while improving the acoustic insulation of walls or ceilings. When properly installed, they allow the wall or ceiling to flex slightly, which absorbs sound.

Image of saw and ear protectors, illustrating the importance of workplace noise risk assessments and compliance with the Control of Noise at Work Regulations 2005 by NOVA Acoustics.

In recent years, the knowledge that noise at work can cause permanent and disabling hearing damage has impacted the design and construction of workplaces in the UK, especially those where manufacturing processes are part of the day-to-day activity.

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Pre-completion sound testing is a requirement of the Part E building regulations and applies to new properties including flats, houses as well as conversions of abode. Pre-completion sound testing places the responsibility for testing on the owner or builder to prove that the sound rating is both accurate and complies with modern regulations regarding noise control.

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Managing noise pollution has become an important consideration for businesses with industrial, commercial or construction sites. The escalating use of noise-emitting equipment in every-day settings – from cooling and heating systems to power generators and fork-lift trucks – means that sound levels can rapidly escalate. Which is why there’s a growing demand for reliable plant noise surveys.

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