Kew's iconic Palm House to temporarily close in £60m renovation project
The extensive renovations, encompassing the adjacent Waterlily House, aim to create the "first heritage net-zero glasshouses of their kind".
The Royal Botanic Gardens (RBG) cited significant deterioration in both structures, last refurbished in the 1980s, necessitating the restoration.
The comprehensive overhaul will involve replacing 16,500 glass panes with high-performance sealed glazing, incorporating bespoke silicone gaskets to minimise heat loss, and installing a fully electrified air and water source heat pump system.
The project is not expected to commence until 2027, with the glasshouses closing for up to five years once work begins.
The Palm House, completed in 1848, houses tropical and sub-tropical plants; the Waterlily House, opened in 1852, showcases giant Amazon waterlilies.
There will also be upgrades to the rainwater storage and irrigation system and the restoration of original ornamental garden layouts and finishes.
Richard Deverell, director of RBG Kew, said: 'This is a pivotal moment in the history of Kew.
'With sustainability at the core of our mission, this project exemplifies our commitment to safeguarding both the environment and cultural heritage.
'The transformation of the Palm House and Waterlily House into net-zero icons will not only protect irreplaceable plants but serve as a beacon of what sustainable heritage can achieve.'
The project is expected to cost £60 million and the relocation and propagation of plant specimens by Kew's horticulturists has already begun.
Two glasshouses, one permanent and one temporary, have been built for the cultivation of the tropical plants as the work commences.
There are around 1,300 plants within the Palm House alone.
Tom Pickering, head of glasshouse collections at RBG Kew, added: 'At the heart of this project is the need to protect the extraordinary plant collections housed in the Palm House and Waterlily House.
'Besides being beautiful, many have cultural, scientific and conservation value, and replacing these collections is unimaginable.
'Achieving net zero in these historic buildings is an unprecedented task, it's a complex challenge which must consider the interplay of horticulture, climatic control, engineering and architecture.'
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