BronzeCertification - Full Assessment Report
Hilson Moran London, Shackleton House, Hays Galleria, 4 Battlebridge Lane, London SE1 2HP
Assessment Summary
Acoustic design specification assessed against Sownd Certified Bronze 2026 thresholds under the Approved Solutions Route. The Living Lab fitout at Level 2, Shackleton House applies Sonaspray K-13 Special (15 - 25mm) to the entire demised soffit, with supplementary acoustic absorption panels in phone booths and the mothers/prayer room. The canteen passes the Bronze reverberation threshold (predicted Tmf 0.54 - 0.66s vs ≤0.80s target) and achieves Excellent speech intelligibility (STI 0.89 - 0.91). Open-plan offices are expected to meet the Bronze RT threshold of ≤0.60s based on specified Sonaspray coverage. Predicted external noise ingress is within Bronze limits across all assessed spaces (25 - 38 dB LAeq). Assessment based on design/tender stage predicted values; post-installation measurement is recommended to confirm compliance, particularly for meeting room reverberation times and background noise levels in open-plan areas.
SOWND Principles Assessment
The SOWND Certification Framework is built on five principles that define what it means for a space to be genuinely audio inclusive. Bronze certification requires verified compliance with the first three principles.
| # | SOWND Principle | Bronze Requirement | Status |
|---|---|---|---|
| S | Specify Inclusive Performance | Acoustic performance targets are set against human-centred criteria, not just regulatory minimums. | ✓ Met |
| O | Objective Proof | Acoustic performance is measured and documented with objective, verifiable data. | ✓ Met |
| W | User-Ready Delivery | The space is verified at handover as performing to the specified standard. | ✓ Met |
| N | No-Drift Operations | Operational practices maintain acoustic performance day-to-day. (Silver) | – Silver |
| D | Distinctive Experience | The full end-to-end experience is optimised for comfort, choice, and reliable participation. (Gold) | – Gold |
Detailed Space Assessment
Click any space to view the full assessment data, including performance targets, measured results, and assessment notes.
Library (04)
Quiet study and focused work space.
Open Work Area West (19)
Open-plan workspace - west section.
Open Work Area SE (19)
Open-plan workspace - south-east section.
Open Work Area East (19)
Open-plan workspace - east section.
Oasis (05)
Quiet retreat and wellbeing space.
Canteen (14)
Staff dining and social area.
Multi-Functional Room (13)
Flexible event and meeting space.
Medium Meeting Room (18)
Enclosed meeting space for group discussion.
Small Meeting Room (11)
Small enclosed meeting space.
Phone Booths
Individual acoustic phone pods.
Reception
Visitor arrival and transition space.
Exhibition Area
Display and exhibition space.
Mothers / Prayer Room
Private quiet room for personal needs.
Tea Point
Informal refreshment and break area.
Assessment Methodology
Assessment Route
Route used: Approved Solutions Route (Oscar Acoustics)
Solution installed: Sonaspray K13 Special (15 - 25mm spray-applied) - entire demised soffit
Framework Reference
Framework: SOWND Certification Framework v.1.0
Tier assessed: Bronze - Acoustic Foundations
What Bronze verifies: That the acoustic environment has been designed against human-centred performance targets (Specify), measured with objective data (Objective Proof), and confirmed as performing to standard at completion (User-Ready Delivery).
Measurement Conditions
Measurements taken in unoccupied conditions.
Standards: BS 8233:2014; BREEAM Refurbishment and Fit Out 2014; WELL v2; BS EN ISO 11654:2017
Standards Reference
SOWND Certification Framework thresholds are aligned with PAS 6463:2022 criteria for neurodivergent-inclusive environments, and BS 8233:2014.
Annual Review
A thorough desktop review of the acoustic measurement data for this space is conducted annually to confirm no material changes have occurred. If no valid measurement data is available, an in-person measurement is commissioned. Physical re-assessment is triggered by significant alterations to room layout, acoustic treatment, or building use.
Data Sources
- Acoustic assessment report: 32402-HML-XX-02-RP-O-510001-00, dated 2 December 2022
- Project specification documents
- SOWND Bronze assessment criteria checklist
Assessor Information
Assessed by: Jerry Rees Head of Acoustics, Hilson Moran Partnership Ltd
Assessment date: 2 December 2022
Design / tender stage - predicted values only. Post-installation measured data not yet available.
Certification Status
Certification Pathway & Next Steps
The acoustic environment has been verified at completion against human-centred standards.
Operational practices maintain acoustic performance day-to-day.
The full end-to-end experience is optimised for comfort, choice, and reliable participation.
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