Reports accepted by Local Planning Authorities across the UK
Polaris Acoustics provides Noise Impact Assessments (NIAs) to support residential and commercial planning applications throughout the United Kingdom.
Whether you’re developing new homes, installing external plant, or converting existing buildings, our reports ensure your proposals comply with BS 8233, BS 4142, and ProPG guidance. Giving planning officers and Environmental Health Officers the confidence needed to approve your scheme.
Request a QuoteFast turnaround · MIOA acoustic consultant · Class 1 instrumentation · UK-wide • Fixed fees
PLANNING NOISE REQUIREMENTS
You may need acoustic evidence where noise could affect a proposed development, or where the development could affect nearby homes. See the examples below of when you might need a noise impact assessment for your planning application.
New homes, care facilities or hotels near roads, railways, industry or commercial premises.
Converting offices, shops or other commercial buildings into residential accommodation.
New plant, ventilation, industrial activity, entertainment or commercial operations near homes.
Already received a planning condition or EHO request for a Noise Assessment?
Send us the detailsPLANNING NOISE REQUIREMENTS
A planning Noise Impact Assessment should give the council clear acoustic evidence, not just a set of noise readings. It usually includes a review of the site and surrounding receptors, baseline noise survey data where required, assessment against the relevant standards, acoustic calculations and practical mitigation advice.
The exact scope depends on the development. A residential scheme near a busy road may require a BS 8233 façade assessment, while new plant or commercial activity near homes may require a BS 4142 assessment. The final report should set out clear findings and recommendations suitable for submission to the local planning authority or Environmental Health Officer.
Read the Full Guide
NOISE SOURCES ASSESSED
The scope of a Noise Impact Assessment depends on the site, the proposed development and the concerns raised by the local planning authority or Environmental Health Officer. For planning applications, the assessment may consider noise affecting the proposed development, noise generated by the development, or both.
Assessment of existing transport or environmental noise affecting new homes, hotels, care facilities or other noise-sensitive uses.
Assessment of external plant, air source heat pumps, fans, condensers, chillers, extract systems or ventilation equipment near homes.
Assessment of workshops, loading areas, deliveries, yards, entertainment uses, music noise, customer activity or other commercial operations.
Assessment of temporary construction noise, vibration, working methods and mitigation where required by planning condition or CEMP.
Not sure which assessment your scheme needs?
Send us the detailsA Noise Impact Assessment (NIA) is a technical report prepared in support of a planning application to assess how noise may affect, or be affected by, a proposed development.
Local planning authorities typically require an NIA where there is potential for noise to adversely impact residential amenity. For example from nearby road or rail traffic, industrial or commercial activities, or proposed mechanical plant and equipment.
At Polaris Acoustics, we undertake robust, evidence-based assessments that establish baseline sound levels, predict future noise exposure, and determine whether a proposal complies with relevant British Standards and planning policy.
Our Noise Impact Assessments are typically undertaken with reference to:
BS 8233:2014 — Guidance on sound insulation and noise reduction for buildings
BS 4142:2014+A1:2019 — Methods for rating and assessing industrial and commercial sound
BS 5228-1:2009+A2:2018 — Noise and vibration control on construction and open sites
ProPG: Planning & Noise (2017) — Professional Practice Guidance on Planning & Noise
These documents provide the framework for an objective, defensible assessment, enabling planning officers and Environmental Health Officers to make informed decisions.
Local Planning Authorities (LPAs) or Councils frequently request a Noise Impact Assessment whenever a development could create, change, or otherwise be affected by noise. By providing a noise impact assessment, the levels of noise can be quantified and can help provide certainty that any impacts, effects and complaints of noise would be avoided, mitigated and minimised.
Required When
Developing new or refurbing residential developments next to busy roads, railway lines and/or industrial noise sources.
Primary Standards
BS 8233, ProPG, BS 4142, ISO 9613-2
Required When
Converting offices to residential use, adding flats above shops, or introducing commercial space within a residential area.
Primary Standards
BS 8233, ProPG, BS 4142, ISO 9613-2
Required When
Installing air-conditioning or air handling units, ASHPs, condensers, chillers, mechanical extract systems, electrical substations.
Primary Standards
BS 4142, NANR45, CIBSE B4
Required When
Carrying out demolition, piling or construction near noise sensitive premises, such as offices, homes and schools.
Primary Standards
BS 5228-1, BS 5228-2
Required When
Adding or modifying mechanical equipment, fans and/or exhaust systems that could alter external sound emissions.
Primary Standards
BS 4142, ISO 9613-2
Required When
A planning condition, complaint or planning enforcement notice requires evidence-based demonstration of the noise levels.
Primary Standards
BS 8233, BS 4142, BS 5228, ISO 9613-2
Our assessments follow the latest British standards, guidance and local planning requirements. Our acoustic consultants also keep up to date with the latest and emerging scientific research to ensure clear, evidence-based reports that make planning approval straightforward.
No obligation • Reports Accepted by UK Councils & Planning Authorities
Polaris Acoustics was appointed by Harrison & Cole Developments to undertake a Noise Impact Assessment for a new five-storey mixed-use scheme in the City of Westminster, comprising ground-floor retail (with potential restaurant use) and four residential levels above. The work was required to discharge a planning condition following Environmental Health Officer comments concerning potential plant noise and sound transmission between the commercial and residential elements.
A 24-hour baseline survey was completed using a Class 1 ACOEM Fusion 4G SLM to IEC 61672-1 standards. Analysis applied BS 8233, BS 4142, and Westminster’s enhanced criterion requiring the rating level to be 10 dB below background. Predictive modelling in ISO 9613-2:2024 guided the final design. Measured backgrounds were 46 dB LA90,day and 38 dB LA90,night, setting assessment limits of 36 dB LAr,Tr day and 28 dB LAr,Tr night, including +5 dB for tonality and intermittency.
Key mitigation measures included:
Relocating plant to the rooftop and within a rear plant room fitted with acoustic louvres
Uprated glazing and System 3 (MEV) ventilation under Approved Document F
Enhanced floor build-up to reduce structure-borne transmission
Despite tight access, weekend monitoring, and a fast-track submission, the condition was discharged without further comment. The project showcased Polaris Acoustics’ ability to deliver bespoke, policy-aligned mitigation within one of the UK’s most demanding planning contexts.
Polaris Acoustics was appointed by a leading petrochemical refinery operator to undertake a Noise Impact Assessment in support of a proposed stack installation within an active refinery site. The assessment was required to evaluate the potential increase in external noise emissions from the new stack and associated plant, with particular consideration of residential receptors located approximately 300 metres away.
A 24-hour baseline noise survey was undertaken using a Class 1 ACOEM Fusion 4G sound level meter in accordance with IEC 61672-1 standards. Measurements were analysed in line with BS 4142:2024 – Methods for rating and assessing industrial and commercial sound, using long-term LA90 background sound levels to determine the rating level criteria for the proposed installation.
Through predictive noise modelling, the sound power of the proposed stack was assessed, including tonal and broadband components. The final design incorporated a bespoke acoustic attenuator and optimised stack height, ensuring the BS 4142 rating level remained below the existing background sound level at the nearest dwellings.
Complementary analysis following the IEMA (2014) Environmental Noise Impact Guidelines confirmed that the absolute change in ambient noise levels from the new plant would be +0.4 dB, which represents an insignificant, negligible impact in perceptual and planning terms.
Included Key Mitigation Measures:
Integration of a custom-designed stack silencer to attenuate broadband and low-frequency emissions
Adjustment of stack height to enhance dispersion and minimise ground-level propagation
Refinement of operational schedules and noise management plans to avoid cumulative tonal interactions with adjacent plant
Despite the site’s complexity and active industrial environment, the assessment demonstrated full compliance with BS 4142 and IEMA impact criteria, allowing the proposal to proceed without objection from the Environmental Health Authority.
Polaris Acoustics was appointed to undertake a Noise Impact Assessment (NIA) in support of a proposed residential development within Southampton, Hampshire. The site was located in an urban environment influenced by road traffic, rail, existing commercial activity, and the wider city soundscape typical of South Coast regeneration areas.
Polaris Acoustics undertook a comprehensive, planning-led assessment in accordance with current national guidance, comprising:
A 24-hour baseline environmental noise survey, undertaken using a Class 1 sound level meter in accordance with IEC 61672-1
Identification and characterisation of dominant noise sources, including road traffic and local commercial activity
Assessment of internal and external noise levels with reference to BS 8233:2014
Application of the ProPG: Planning & Noise (2017) framework, including a Stage 1 noise risk assessment and Stage 2 Acoustic Design Statement
The assessment demonstrated that a good standard of residential amenity could be achieved through early integration of acoustic design, including:
Optimisation of site layout to locate noise-sensitive rooms on quieter façades
Enhanced glazing specifications to achieve compliance with BS 8233 internal noise criteria
Use of mechanical ventilation to avoid reliance on open windows in higher-noise locations
These measures ensured compliance with national guidance without imposing unreasonable constraints on the development.
Frequently asked questions
Answers to common questions about noise impact assessments for planning applications, including when a report is required, what a survey involves and what information is needed to provide a quotation.
A noise impact assessment is a technical report that considers how noise may affect a proposed development, or how noise from a proposed use may affect nearby receptors. For planning applications, it is commonly used to assess road, rail, commercial, industrial, entertainment, plant or construction noise and to set out suitable mitigation where required.
A noise impact assessment for planning is usually required where a proposed development is close to existing noise sources, or where the development itself could generate noise.
This may include residential schemes near roads, railways, pubs, commercial premises or industrial uses, as well as new plant, external equipment, workshops, leisure uses or mixed-use developments.
To provide a fixed-fee quote, we usually need the site address, planning reference if available, a brief description of the proposed development, any council comments or planning conditions, and relevant drawings or plans. If the local planning authority has specifically requested a noise impact assessment, please send the wording of the request.
Not always, but many planning assessments do require a baseline noise survey. The need for monitoring depends on the site, the type of development, the nearby noise sources and the requirements of the local planning authority. Where a survey is required, Polaris Acoustics can arrange suitable attended or unattended measurements using Class 1 sound level monitoring equipment.
The relevant standards depend on the assessment scope. Common references include BS 8233 for internal and external noise levels in residential development, BS 4142 for industrial and commercial sound, ProPG for residential sites exposed to transport noise, and BS 5228 for construction noise and vibration. The report will identify the appropriate methodology for the project.
Mitigation depends on the source and receptor. Recommendations may include upgraded glazing, acoustic ventilation, façade design measures, acoustic barriers, plant noise limits, silencers, acoustic enclosures, operational controls or further design-stage advice. The aim is to provide practical mitigation that is proportionate to the planning risk.
Planning noise assessment support
If noise has been raised by the council, Environmental Health Officer or planning consultant, Polaris Acoustics can help you move the application forward. We prepare clear, planning-ready noise impact assessments for residential, commercial, industrial and mixed-use developments, with practical recommendations for mitigation where required.
Request a QuoteMIOA • BS 8233 & BS 4142 Noise Assessments • LPA Accepted Reports
