Installation of two external air conditioning units with acoustic enclosures approved by RBKC

Installation of Two External Air Conditioning Units with Acoustic Enclosures to Roof Level

Introduction

This case study describes the installation of two external air conditioning units with acoustic enclosures to roof level. Working in a conservation area, the project demanded careful planning, robust noise mitigation, and respectful visual impact control.

Installation of Two External Air Conditioning Units with Acoustic Enclosures to Roof Level

Necessity of External AC Units

Modern London buildings, especially those repurposed for mixed use, require effective air‑conditioning to maintain a comfortable internal environment. Placing two external air conditioning units on the roof ensures efficiency, frees up internal space, and supports building performance.

Why Acoustic Enclosures Matter

Roof‑mounted AC units can exceed 0.6 m³ in total volume and often require planning approval, especially where multiple units are involved. Acoustic enclosures are critical to reduce operational noise and satisfy council and neighbour concerns.

Acoustic Enclosures to Roof Level – Technical & Planning Considerations

Conservation Area and Visual Sensitivity

Given the conservation area setting, both AC units and their enclosures needed to be discreet. Roof‑level positioning, external screening, and low‑profile acoustic casings were specified to minimise visual impact and align with policy protecting historic roofscapes.

Noise Concern from Neighbours

Neighbours often raise concerns about hum and vibration from rooftop plant. A noise impact assessment was essential. We engaged an acoustic consultant to model background sound levels and predicted noise from the two units operating at full capacity.

Installation of Two External Air Conditioning Units - Acoustic Process

Working with Acoustic Specialists

4D Planning collaborated closely with acousticians to:

• Accurately model projected dB levels at nearest residential façades
• Specify high‑performance acoustic enclosures and anti‑vibration mounts
• Develop a noise control strategy compliant with local and national standards

Coverage ensured that sound emissions would sit comfortably below harmful thresholds.

Planning Submission Structure

The application package included:

1. Site plans showing the roof‑level positioning of both units and enclosures
2. Technical drawings of the acoustic enclosures and roof screening
3. A detailed noise impact assessment report with mitigation measures
4. Evidence of consultation with neighbours and design officers

This thorough approach demonstrated our commitment to preserving amenity and heritage context.

Outcome of Installation of Two External Air Conditioning Units

Optimised Building Performance

The approved scheme allows maximum indoor comfort while freeing up internal floor space. The two roof‑level units supply efficient cooling and ventilation without clutter or internal disruption.

Neighbour and Conservation Assurance

Post‑installation testing confirmed noise levels remained well below council limits. Acoustic enclosures and screening ensured the rooftop installation blends into the heritage context. Neighbours reported minimal to no disturbance, affirming the success of technical mitigation.

Conclusion

The installation of two external air conditioning units with acoustic enclosures to roof level demonstrates how technical design, noise control, and conservation‑sensitive planning can align to deliver modern building performance. 4D Planning’s coordination with acoustic specialists and pre‑application engagement secured a successful outcome with high chances of approval in sensitive urban areas.

If you need support with rooftop plant installations, noise assessments, or planning in conservation areas, get in touch to discover how we can help.