ISG has been appointed to deliver a £24m restoration of the Temperate House at Kew Gardens and two new leisure centres for Walsall Council also worth £24m.
The contractor will restore the Victorian glasshouse, built in 1863, and repair and replace ventilation and irrigation systems.
It will also improve facilities and accessibility for visitors and staff at the largest remaining Victorian glasshouse in the world.
The £24m building contract is part of a larger £36m restoration project.
The Temperate House houses Kew’s collection of temperate-zone plants. Kew Gardens has spent the past year moving large, mature plants and growing new ones to enter the restored glasshouse.
ISG’s Southern regional managing director Stuart Deverill said: “The Royal Botanic Gardens at Kew has a global reputation for plant research and conservation and to play a role in supporting that important work through this refurbishment project is a real privilege.
“The Temperate House is the largest remaining Victorian glasshouse and we are delighted to be working to protect this stunning building, while creating an environment where plants, education and tourism can flourish.”
Work is due to complete in spring 2017, then there will be a year of replanting work, with plans for a formal re-opening in May 2018.
ISG delivered restoration of the Grade I listed Royal Festival Hall and the Grade II Vaughan’s Mansion in Shrewsbury, and carried out the £16m refurbishment of the Grade I listed Royal Institution of Great Britain.
RBG Kew Temperate House project director Andrew Williams said: “We are delighted that work can now commence on this vital restoration of one of the nation’s most important historic horticultural buildings, built to protect, display and enable education and research using a living collection of plants from the temperate regions.”
ISG is also delivering two new leisure centres for Walsall Council in a £24m project.
It will replace Oak Park and Bloxwich Leisure Centres with new facilities, including 25 m eight and six-lane swimming pools, sports halls, 100-station fitness suites, dance studios, squash courts, a café and upgraded external pitches.