Garden Science Hub with Public Exhibition, Garden Science Hub with Public Exhibition, Members Library and Archive Space.

A 4,700m² hilltop building, featuring a roof terrace at the highest point of celebrated gardens within a significant Green Belt landscape, includes advanced research labs, libraries, and classrooms. Future-proof services for the building, gardens and the wider infrastructure were provided.

The RHS Hilltop development is the UK's first dedicated centre for horticultural and environmental science, featuring research labs, exhibition spaces, libraries, classrooms, an herbarium, and a café.

Skelly & Couch provided energy modelling, environmental design, and daylight and overheating analysis, drawing on experience from projects at the Royal Botanic Gardens, Kew, and Wakehurst Place. Working closely with garden designers, they created a climate-resilient, future-proof infrastructure for the Hilltop gardens and wider site.

The building’s design maximises natural light and ventilation through rooflights, while exposed thermal mass supports passive cooling, and high-specification glazing minimises summer overheating. A sustainable urban drainage system (SUDS) integrates ponds, infiltration trenches, basins, and swales into the landscape, with possible links to an irrigation storage pond.

To mitigate noise from the nearby A3 road, the herbarium archive is enclosed by thick walls, stabilising temperatures, while ground-coupled air ducts and hygroscopic materials further manage humidity, ensuring optimal conditions.

Active design measures further enhance the building’s sustainability, cooling draws on the site's irrigation system, using river and borehole water; and energy-saving features include photovoltaic cells offsetting 10% of the building's carbon emissions, mechanical ventilation with heat recovery, and coordinated power supplies to minimise voltage drop.

Beyond delivering MEP and sustainability services for the new building, Skelly & Couch also designed MEP, SUDs and drainage systems for the surrounding gardens and the wider infrastructure masterplan.  The building form created three primary gardens— The Health and Wellbeing Garden (designed by Matt Keightley), The Wildlife Garden and The World Food Garden (both designed by Ann-Marie Powell) —along with smaller teaching and convening spaces.

RHS Wisley creates a sustainable hub for research, education, and community, with a harmonious integration of the building and landscape.

Awards

2021 – Guildford Design Award Winner Public Realm.

2021 – Guildford Design Award Winner Public Realm.

2022 – WAN Awards – Civic Institutes and Community Space Bronze.

2022 – AJ Architecture Award Finalist – Civic projects.

2023 – Civic Trust Award Regional Finalist.

2023 – Selwyn Goldsmith Award Finalist.

2023 – RIBA South East Award Winner.

An AJ Architecture Awards 2022 finalist in the Civic Projects category. A Regional Finalist for both a 2023 Civic Trust Award and a Selwyn Goldsmith Award for Universal Design. Winner of a 2023 RIBA South East Award. See the judges' citation: https://www.ribaj.com/buildings/regional-awards-2023-south-east-wilkinsoneyre-rhs-hilltop-culture-entertainment