Benenden Hospital

Kalwall Roof Daylighting Case Study

Overview

Benenden Hospital in Cranbrook, Kent underwent a major redevelopment programme designed to modernise its facilities and enhance the patient experience. The £40 million project introduced a new reception and waiting area that would serve as the central arrival point for patients and visitors.

One of the key architectural goals of the redevelopment was to create a welcoming and comfortable environment inside the hospital entrance. Healthcare buildings often struggle with balancing natural light, temperature control, and glare reduction in large interior spaces such as reception areas.

To address this challenge, the project incorporated a large Kalwall translucent ridge roof above the reception lobby. Structura was appointed to supply and install the specialist roof system as part of the redevelopment works.

The result is a highly functional daylighting solution that provides evenly distributed natural light while maintaining thermal performance and occupant comfort.

This project demonstrates how advanced translucent façade systems can improve both the environmental performance and user experience of healthcare buildings.

Project Metrics

The Benenden Hospital redevelopment represents a major investment in healthcare infrastructure and patient experience. Key performance and project metrics include: 

Project value: £40 million redevelopment

System installed: Supported Kalwall translucent ridge roof

Building area served: Reception and waiting lobby

Primary benefit: Glare-free natural daylight with minimal solar heat gain

These features contribute to the long-term efficiency and functionality of the new hospital facilities.

The Challenge

Large hospital reception areas must meet several demanding requirements. These spaces serve as the first point of contact for patients and visitors, making comfort, visibility, and environmental quality critical. For the Benenden Hospital redevelopment, the project team needed to solve several key challenges.

Creating a Welcoming Reception Environment

Hospital reception areas can often feel clinical or enclosed if artificial lighting is relied upon too heavily. For this redevelopment, the design team wanted to introduce natural daylight into the space to create a brighter and more welcoming atmosphere. Natural light is widely recognised for improving wellbeing and reducing stress levels in healthcare environments. However, introducing daylight into large internal spaces requires careful design to prevent glare and excessive solar heat gain. The challenge was therefore to create a daylighting system that enhanced the interior environment while maintaining comfort for occupants.

Managing Solar Heat & Glare

Traditional glazed roof systems can introduce strong direct sunlight into interior spaces, which can cause glare and increase internal temperatures. In a hospital environment, this can lead to discomfort for patients and staff while also placing additional load on building cooling systems. The redevelopment required a roof system capable of delivering diffused daylight without introducing excessive solar heat gain.

Achieving High Thermal Performance

Hospitals operate continuously and must maintain stable internal temperatures throughout the year. Building envelope systems must therefore provide excellent insulation to minimise energy consumption and maintain comfortable conditions for occupants. The roof system above the reception area needed to provide strong thermal insulation while still allowing daylight to enter the building. Balancing daylight performance with insulation requirements was a key design consideration.

Ensuring Long-Term Durability & Maintenance Efficiency

Healthcare buildings require construction solutions that perform reliably over long periods with minimal maintenance disruption. Roof systems in particular must be safe, durable, and easy to maintain, as access for repairs can be disruptive and costly in operational healthcare facilities. The project therefore required a roof system that could deliver long-term performance while minimising ongoing maintenance requirements.

Structura’s Solution

Structura was appointed to deliver the supply and installation of a supported Kalwall translucent ridge roof above the new reception lobby. Kalwall systems are widely used in architectural applications where evenly distributed natural light and strong thermal performance are required. The translucent panels diffuse incoming daylight, eliminating harsh glare while maintaining consistent interior illumination. The roof system was designed to integrate with the architectural design of the reception space while delivering the environmental performance required for a modern healthcare building.

Project Results

The Kalwall ridge roof installed at Benenden Hospital has successfully enhanced both the environmental performance and user experience of the new reception area. The system provides a high-quality daylighting solution while supporting the long-term operational needs of the healthcare facility.

Glare-Free Natural Daylighting

One of the most immediate benefits of the installation is the consistent, glare-free daylight introduced into the reception space. The translucent Kalwall panels diffuse incoming sunlight, spreading soft natural light throughout the interior without the harsh glare typically associated with conventional glazing systems. This creates a more comfortable environment for patients and visitors while improving overall visibility within the lobby.

Improved Energy Efficiency

The insulating properties of the Kalwall roof contribute to the building’s energy performance by helping maintain stable internal temperatures. By reducing solar heat gain while still allowing daylight to enter the building, the roof system helps limit the demand placed on heating and ventilation systems. This supports lower operational energy consumption and helps improve the building’s long-term sustainability.

Comfortable Reception Environment

The new reception lobby at Benenden Hospital now provides a welcoming environment for visitors. The space includes seating areas and catering facilities where patients and guests can relax while waiting. The natural daylight provided by the ridge roof enhances the overall atmosphere, making the environment feel open and comfortable. Healthcare environments benefit significantly from daylighting strategies that support wellbeing and reduce stress levels for patients.

Low Maintenance & Long-Term Reliability

The Kalwall roof system installed by Structura was selected not only for its daylight performance but also for its long-term reliability. The roof is designed to be durable, low maintenance, and safe to walk on for maintenance access. These characteristics ensure the system will continue to perform effectively while minimising maintenance costs over the life of the building.

Conclusion

The Benenden Hospital redevelopment demonstrates how carefully designed façade and roof systems can significantly improve the performance and experience of healthcare buildings. By installing a large Kalwall translucent ridge roof above the reception lobby, Structura helped create a bright, welcoming environment that balances natural daylight with strong thermal performance.

The roof system delivers glare-free illumination, improved energy efficiency, and durable long-term performance while enhancing the architectural quality of the space. As hospitals continue to evolve to meet the needs of patients and staff, projects like this highlight the value of specialist façade engineering in delivering functional, sustainable, and comfortable healthcare environments.