Background
Anderson Acoustics was appointed by Fuse Architects to undertake planning-stage noise and air quality assessments for the redevelopment of 2 Thornlaw Road, West Norwood. The proposed development comprises 20 residential apartments with community use at lower ground level, located adjacent to Knights Hill (A215) and opposite a 24‑hour operational bus garage.
The assessments were prepared to support a planning application and to confirm that the site could accommodate residential use in accordance with relevant national and local policy.
The Challenge
The site is exposed to elevated road traffic noise from Knights Hill, with additional intermittent noise from bus movements associated with Norwood Bus Garage. Measured night-time noise levels placed parts of the site within medium to high-risk categories under ProPG, requiring a considered acoustic design response.
The site also lies within the London Borough of Lambeth Air Quality Management Area. Although baseline pollutant concentrations were compliant with national objectives, the introduction of new residential receptors and construction activity required assessment to demonstrate site suitability.
Our Approach
Environmental noise surveys were undertaken at representative site boundaries to establish robust daytime and night-time baseline conditions. The survey data was used to develop a calibrated 3D noise model, enabling façade-specific predictions and supporting ProPG Stage 1 and Stage 2 assessments in line with BS 8233.
The air quality assessment drew on verified local authority monitoring data and London Atmospheric Emissions Inventory modelling. The scope included operational impacts, construction dust risk, and assessment against London Plan air quality neutral and positive policy requirements.
The Solution
A façade based acoustic strategy was developed to control internal noise levels within habitable rooms. Mitigation focused on building fabric performance, including façade zoning and specification of minimum glazing sound insulation performance appropriate to predicted noise exposure.
External amenity areas were assessed against BS 8233 guidance, with winter gardens and alternative quieter spaces used where appropriate to manage urban noise exposure. The overheating risk was also assessed, with targeted alternative ventilative cooling recommended where Approved Document O noise criteria could not be met acoustically with open windows.
From an air quality perspective, the assessment confirmed that predicted pollutant concentrations at the site were below relevant objectives. The car‑free nature of the scheme, use of air source heat pumps, electric vehicle charging and cycle storage resulted in negligible operational impacts. Construction dust risk was assessed as low to medium, with proportionate mitigation measures defined.
The Outcome
The assessments demonstrated that the site is suitable for residential and community use from both noise and air quality perspectives. Internal noise criteria can be achieved through coordinated façade design and ventilation strategy, and external amenity areas provide acceptable conditions for an urban location.
Operational air quality impacts were shown to be negligible, with the development meeting policy requirements without the need for additional mitigation. The assessments provided clear parameters to inform detailed design and coordination.
Conclusion
This project reflects our approach to planning-stage environmental assessment on constrained urban sites. Measured survey data, predictive modelling and proportionate mitigation were used to support planning while providing clear, technically grounded guidance for subsequent design stages.
Project Progress
The London Borough of Lambeth granted planning permission in January 2026.
