Savill Building

The roof is the dominant feature of the building:

"So what you have is effectively a great big weather-sealed canopy, perched on dynamically angled steel legs. It is the ultimate summerhouse, the granddaddy of gazebos."

Hugh Pearman[2]

The building has a 'three-domed' sinusoidal-shaped gridshell roof of two layers of interlocking larch laths[3] (50 × 80 mm) on a one-metre square grid, supported on steel quadropods and a steel tubular ring-beam. The exact form of the roof was designed by Buro Happold to be the most structurally efficient possible using specialist in-house software (Tensyl). The roof is clad in plywood panels, with aluminium weather proofing and a top cladding of oak. All timber was harvested from the nearby Crown Estate. The roof is over 90 m in length and up to 25 m wide, and because of its own separate structural system appears to hover over the brick and glass facade of the building.

The carpentry, which used over 400 larch trees and 20 carpenters, was done by the Green Oak Carpentry Company.[4]

The roof structure remains exposed from the inside, and is a notable feature of the building. The entrance facade is covered by an extensive green roof, which is planted with Microbiota decussata and Juniperus squamata. The exterior cladding of the building is a full-height glass curtain walling system, providing views from inside and creating an unusual lighting effect in the dark.[5]

The building, which is partially below ground level, contains a shop, seminar rooms, offices, planteria (small garden centre) and restaurant, with a raised terrace along one edge allowing views over the gardens from the centre's interior spaces. Below the entrance there is a basement housing service spaces including the kitchen, storerooms and washrooms.

The large main internal space is subdivided by Corian 'pods' which are separate from the main building structure.