Background
University Hospitals Sussex NHS Foundation Trust embarked on a comprehensive project to refurbish and reconfigure it’s Emergency Department and Acute Floor at Royal Sussex County Hospital.
Anderson Acoustics was commissioned by Willmott Dixon to support the design team from RIBA Stage 2 to completion with acoustic design reviews and noise impact assessments for the project.
What we did
Acoustic Design Review
The acoustic design review for the Royal Sussex County Hospital Acute Floor Expansion systematically identified risks and opportunities to optimise acoustic performance throughout the project. Focus areas included the specification of partitions, sound insulation, and the control of noise from building services.
Key design elements such as observation windows in partitions, doors, and open-fronted cubicles were assessed, with mitigation strategies recommended. Opportunities for cost efficiencies and performance enhancements were identified in the design of partitions, the application of sound-absorbent finishes, and the configuration of sensory assessment rooms.
The design reviews evaluated the architectural and mechanical proposal against BREEAM and HTM 08-01 standards, establishing clear criteria for managing noise intrusion from both external and internal sources. Performance benchmarks were detailed for walls, doors, and glazed partitions, with further guidance provided on sound-absorbent treatments and the control of mechanical plant noise and vibration.
At the final design stage, assessments confirmed compliance with required standards for indoor ambient noise levels, internal sound insulation, reverberation times, and building services noise. Where residual risks were identified, further mitigation measures were recommended to ensure acoustic quality and regulatory compliance.
Plant Noise Impact
The noise impact assessment focused on the replacement of the AHU supply unit and its impact on nearby noise-sensitive receptors. Assessment guidance was based on the Noise Policy Statement for England, National Planning Practice Framework, and Planning Noise Advice Document: Sussex.
A detailed environmental noise survey was conducted to determine representative background sound levels. Predictions were made to establish the plant noise rating levels at the nearest receptors, demonstrating the resultant impact in line with BS 4142 guidance. Recommendations included the installation of an in-line attenuator to reduce plant noise from the termination point.
Conclusion
By addressing design risks, identifying opportunities for improvement, and implementing effective mitigation measures, we ensured the project would comply with relevant standards and minimise noise impact on surrounding areas.
Project Progress
The Unit was officially opened in November 2025. For more information, head on over to the Willmott Dixon Interiors website
