In summary, the proposal provides science research space, a teaching space and a new accessible entrance at ground floor level. The science research space is indicated in red and blue and the teaching space in green.

The teaching space is located on the ground and first floor level with a Social Learning Avenue (indicated in yellow) in between. This allows this more highly populated space to benefit from both the new entrance as well as the existing main entrances from the walkways. The narrower form at these levels allows the teaching spaces to benefit from more natural daylight as they are next to the external façade.

The new accessible entrance connects into the ‘Learning Avenue’ at Level 0 (indicated in yellow). This Avenue will be extended through later phases of the Lasdun Wall Refit and through Building 3 into Building 4 through the centre of the existing building.

The science research spaces are above the teaching spaces and have the deeper 28m planform. This deeper planform provides a covered entrance podium as part of the new accessible entrance in the left-handspur. In the right-hand spur it provides a new triple height space to allow for science activities that need a higher floor to ceiling height.

The Arts Spur is reconfigured internally to provide science research space throughout.

The proposal is designed to minimise the tree loss by keeping the new extension spurs close to the north façade, which maintains the trees in the copse adjacent to Chancellors Drive, this is illustrated by the image on the left. This image also shows the rooftop plant concentrated on the north of the proposal and at a lower level to preserve the key strategic views from the south and Broad.

The following axonometric views show the detailed general arrangement for each floor of the proposal.

The 3D images below show the existing façade on the left, and the proposal to restore and refurbish the façade on the right. The existing façade has no insulation and single glazed windows that are beyond their design life, leading to considerable heat loss in the winter and overheating in the summer. This creates an unsustainable demand on the heating and cooling of the building, which in turn generates significant amounts of carbon in a vain attempt to maintain the comfort levels. The new proposal addresses this by replacing the windows with new double glazed units, designed to match the original and providing a new modern insulation layer to the internal face of the concrete façade. The concrete panels are conserved and provided with new robust internal fixings during this process. This is a fundamental improvement to enable the historic fabric of the spandrel panels to be retained whilst also achieving 85% improvement in thermal performance.