Noise Impact Assessment (ProPG & BS 8233)
Residential development noise impact assessment to BS 8233:2014, ProPG (May 2017) and the WHO Night Noise Guidelines for Europe. Internal LAeq targets, garden amenity, glazing and acoustic ventilation specification, overheating-cooling interaction.
The standard for residential planning noise assessment
Every UK residential planning application within meaningful proximity of a noise source — road, rail, aircraft, industrial, commercial or entertainment — requires a noise impact assessment. The current methodology is the ProPG (Professional Practice Guidance on Planning & Noise, May 2017, ANC / IOA / CIEH) framework, with internal LAeq design targets from BS 8233:2014 and external garden amenity criteria. The Noise Policy Statement for England (NPSE) provides the overarching policy framework.
The ProPG framework places the development into one of four risk bands (negligible / low / medium / high) and prescribes the type and depth of assessment required. The assessment then demonstrates that internal noise levels meet BS 8233:2014 targets (35 dB LAeq daytime in living rooms; 30 dB LAeq at night in bedrooms; 45 dB LAFmax for individual noise events affecting sleep), and that external amenity space meets the 50 dB LAeq desirable / 55 dB LAeq upper threshold.
Where mitigation is needed, we specify glazing acoustic performance (Rw + Ctr values), acoustic ventilation (background ventilators with insertion loss curves), boundary fencing and building orientation. Where mechanical cooling is needed to allow windows to remain closed, we address the overheating-cooling interaction with Part O of the Building Regulations.
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ProPG Stage 1 Noise Risk Assessment
Initial risk-banding of the site against the ProPG categories (negligible / low / medium / high), based on a baseline noise survey. Determines the depth of further work required and the planning case argument.
ProPG Stage 2 Full Assessment
Full Stage 2 assessment for medium / high risk sites: detailed survey, prediction at every facade, internal LAeq calculation per BS 8233, garden amenity assessment, mitigation design, AVO (Acoustic Verification on Occupation) recommendations.
Glazing & Facade Specification
Acoustic glazing specifications (Rw + Ctr) for each facade based on the predicted external level and the BS 8233 internal target. Manufacturer-neutral specifications that the developer can tender against.
Acoustic Ventilation Design
Background ventilator selection with insertion loss curves matched to the facade attenuation, ensuring the BS 8233 internal target is met with closed windows. Coordinated with Building Regulations Part F and Part O.
Garden Amenity Assessment
External garden amenity space assessment per BS 8233 (50 dB LAeq desirable, 55 dB LAeq upper threshold). Boundary fencing, building orientation and layout recommendations to achieve target.
Mechanical Cooling & Overheating
Where windows must remain closed to meet acoustic targets, we work with the M&E and SAP teams on the overheating-cooling interaction under Building Regulations Part O 2022.
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Frequently Asked Questions
What is ProPG?
The ProPG (Professional Practice Guidance on Planning & Noise, May 2017) is the ANC / IOA / CIEH-published methodology for residential planning noise assessment. It risk-bands the site, prescribes the depth of further work, and integrates BS 8233 internal targets with the WHO night-noise framework.
What are the BS 8233:2014 internal targets?
35 dB LAeq, 16h in living rooms (daytime); 30 dB LAeq, 8h in bedrooms (nighttime); 45 dB LAFmax for individual events affecting sleep (this is the WHO derived target rather than BS 8233 directly, but ProPG aligns the two).
What about garden amenity?
BS 8233 sets a desirable external garden amenity target of 50 dB LAeq,16h and an upper threshold of 55 dB LAeq,16h. ProPG accepts higher levels where there is a demonstrable wider planning balance, but the local authority will expect mitigation (orientation, screening) where the levels exceed the upper threshold.
What if I need closed windows to meet the targets?
Then we specify acoustic ventilation (background ventilators with appropriate insertion loss) and address the overheating interaction. The current Building Regulations Part O (2022) explicitly covers this scenario.
How much does a ProPG assessment cost?
A ProPG Stage 1 noise risk assessment with baseline survey and report typically starts from around £1,800 to £2,800 plus VAT. A full Stage 2 assessment with mitigation design, glazing schedule and acoustic ventilation specification is typically £3,000 to £5,500 depending on site size and complexity.