Baseline noise surveys, BS 4142 and BS 8233 assessments, and ProPG acoustic design statements for residential and mixed-use planning submissions. Clear mitigation specifications your design team can act on.
Send us your site postcode and project details — we'll advise which assessment applies and provide a survey and reporting quote within one working day.
Thanks — we’ll screen the noise risk and confirm the assessment scope and quote within one working day.
A noise impact assessment is a supporting planning document that quantifies existing noise levels at a site, predicts the noise environment for future occupants (or nearby existing occupants), and specifies any mitigation required to demonstrate the development will not cause significant harm to health or amenity.
Under NPPF paragraph 191, planning decisions must avoid noise giving rise to significant adverse impacts on health and quality of life, and mitigate any adverse effects on health and quality of life. In practice, this means most planning applications for residential development near a noise source — or for a new noise source near residential — will require a noise impact assessment before validation or approval.
The assessment is normally required at the planning submission stage. Where a local planning authority attaches a noise-related planning condition to an approved application, the assessment can also be needed after consent, in order to discharge the condition before construction begins.
Different projects call for different standards. Most planning submissions use one or a combination of the three main frameworks below. We confirm the appropriate methodology as part of the initial quotation.
BS 4142 is used when a specific noise source — factory plant, air source heat pump, chiller, delivery yard, kitchen extract, industrial process — could affect nearby residential receptors. The assessment compares a rating level of the source (measured or predicted, with penalties for tonality, impulsivity or intermittency) against the background sound level to determine likely impact.
The greater the difference above background, the greater the impact. A rating +10 dB above background typically indicates a significant adverse impact; +5 dB an adverse impact; and around background a low impact.
BS 8233 sets internal ambient noise level targets for buildings — the levels occupants should experience inside habitable rooms with windows closed. Typical targets are 35 dB LAeq,16h in living rooms and 30 dB LAeq,8h in bedrooms, plus 45 dB LAFmax for individual noise events at night.
Achieved by specifying glazing, ventilation and facade construction to attenuate external noise down to the target internal level. Also gives guidance on desirable external noise levels in gardens and shared amenity space (typically 50–55 dB LAeq).
ProPG is the industry-preferred framework for assessing new residential development exposed to transportation noise (road, rail, aircraft). It structures the work in two stages: an initial noise risk assessment classifying the site as negligible / low / medium / high risk, followed by a full acoustic design statement covering internal levels, external amenity, ventilation strategy and mitigation.
Increasingly the default framework used by LPAs and appeal inspectors for residential planning submissions — a well-structured ProPG report is often the difference between a smooth validation and repeated requests for further information.
ProPG classifies sites by the free-field external noise exposure at the site facade. The classification determines the depth of assessment expected and the level of mitigation the design will need to demonstrate.
The categories are not pass/fail — they set the expectation for how much acoustic justification a planning submission needs. High-risk sites can still gain consent, provided the ProPG acoustic design statement demonstrates that internal levels, external amenity, and ventilation strategy are properly addressed.
We carry out a free initial noise risk screening from postcode and site location before quoting for a full survey. There is no charge for this initial check.
Not sure what risk category your site falls into? Send us the postcode and site outline and we’ll do an initial screening at no charge, before you commit to a full survey.
Request a screening →The strongest planning submissions treat noise as a design driver, not a compliance afterthought. Decisions around building orientation, room layout, facade construction, glazing specification, and ventilation strategy are all shaped by the site’s noise environment — and they are all much cheaper to influence at RIBA Stage 2 than at Stage 4.
Getting the noise impact assessment underway before the planning drawings are finalised means the mitigation package can be baked into the design, rather than bolted on later as a condition-discharge exercise. It also avoids the risk of a planning refusal on noise grounds — a costly outcome that a well-timed assessment can prevent.
We are happy to engage as an advisory service at the early design stage — running an initial noise risk screening and giving the design team a view of likely mitigation requirements before the formal survey is booked. There is no charge for this initial screening.
Most planning submissions follow the four-stage process below. Timing depends on site accessibility, planning deadline, and whether an on-site survey is required — we agree the programme up front so everyone knows what to expect.
A significant adverse impact finding is not a refusal — it is a specification. The role of the assessment is to identify precisely where the mitigation needs to sit so that the development can be delivered without harm to health or amenity.
Because the assessment quantifies noise at individual facades and rooms, mitigation can be targeted where it is actually needed rather than applied uniformly across the whole building. A single road-facing facade may need upgraded glazing and mechanical ventilation, while the courtyard-facing facades of the same building need no mitigation at all.
We include one round of mitigation specification and reassessment within our standard fee. Where the site is genuinely challenging, we advise on the trade-offs between different mitigation packages before design decisions are locked in.
Baseline noise surveys, BS 4142 assessments, and ProPG acoustic design statements — delivered locally with knowledge of the LPAs and Local Plan noise policies that will assess your submission.
Noise impact assessments for residential and mixed-use planning applications across Birmingham, Solihull, Coventry, Wolverhampton, and the wider West Midlands — including sites near the A38, M6, and the West Coast Main Line.
Noise impact assessments across Bristol, Bath, South Gloucestershire, and the surrounding South West. Familiar with Bristol City Council’s noise policy stance and the acoustic expectations for urban-infill and city-centre residential.
Based in Worcester — noise impact assessments across Malvern, Droitwich, Evesham, Bromsgrove, and Redditch. Our home county, with the fastest survey mobilisation and deepest local planning knowledge.
Noise impact assessments across Cheltenham, Gloucester, Stroud, Tewkesbury, and the Cotswolds. Early screening included to help design teams navigate the acoustic expectations of AONB and conservation-area sites.
Noise impact assessments delivered nationally where the project scale justifies the travel. Regularly working outside our core regions on ProPG and BS 4142 commissions — contact us wherever your site is.
Looking for a noise impact assessment near you? Whether it’s a residential scheme facing a main road in Birmingham, a city-centre conversion in Bristol, or a new industrial unit near dwellings in the Cotswolds — we deliver assessments that hold up under LPA scrutiny with clear mitigation your design team can build to. Call 01386 365145 or email us to get started.
A noise impact assessment is typically required when a planning application involves either introducing a noise-sensitive use (residential, care home, school) into an area with existing noise sources, or introducing a new noise source (commercial plant, entertainment venue, industrial premises) near existing residential receptors. It may be required by a specific planning condition, by local plan policy, or as a standard supporting document under NPPF paragraph 191.
Councils commonly ask for one before validating an application for change-of-use to residential, for new dwellings within 300m of a main road, or for commercial premises with external plant.
BS 4142:2014+A1:2019 assesses industrial or commercial sound (plant, machinery, deliveries) affecting nearby residential receptors — by comparing a rating level against the background sound level.
BS 8233:2014 defines target internal ambient noise levels inside habitable rooms and target external levels for amenity spaces — the acceptance criteria a facade or ventilation strategy needs to meet.
ProPG (2017) is the industry framework specifically for assessing new residential development exposed to transportation noise — it structures the work into an initial noise risk assessment followed by a full acoustic design statement.
Most planning submissions take 2–3 weeks in total: 3–5 working days to arrange and complete an on-site baseline noise survey (usually 24 hours of unattended measurement to capture day, evening and night periods), 5–7 working days for data analysis, predictive modelling, and report writing, and any additional time for iterative mitigation design if significant impact is identified.
Where planning deadlines are tight, we can provide an initial noise risk screening based on desktop review within 48 hours so you know whether a full assessment will be required.
For most planning submissions, an on-site baseline noise survey is required — measured data is much more defensible than modelled or predicted data alone, and local planning authorities typically require it.
Desktop-only assessments may be acceptable for very early feasibility studies, small-scale applications where noise risk is clearly low, or where robust noise contour data already exists (for example, DEFRA strategic noise maps for major roads and railways). We advise on the appropriate approach at the initial enquiry stage.
A significant impact finding does not mean the development cannot proceed — it means mitigation is required to bring noise levels within acceptable limits. Common mitigation includes upgraded glazing specifications, acoustic trickle vents or mechanical ventilation to allow windows to remain closed, orientation of habitable rooms away from the noise source, provision of acoustic barriers or bunding, and layout changes to protect external amenity areas.
The assessment report specifies exactly what mitigation is required for each affected room or facade, giving the design team a clear specification to work to.
They are separate stages of the acoustic design and compliance process. A noise impact assessment is carried out at the planning stage to assess external environmental noise (traffic, industrial, commercial) affecting the site and to specify design mitigation. Sound insulation testing under Approved Document E is carried out at the as-built stage to verify that internal separating walls and floors between dwellings achieve the required airborne and impact sound insulation values.
Both may be needed on the same project — the noise impact assessment shapes the facade design, while sound insulation testing verifies the internal party constructions.
Send us your site postcode and application details and we’ll screen the noise risk, confirm which standards apply, and provide a survey and reporting quote — within one working day.
Send us your project details and we’ll screen the noise risk, confirm the assessment scope, provide a fee proposal, and advise on any early design considerations — within one working day.
We’ll screen the noise risk, confirm the assessment scope, and come back within one working day.