New single storey platform enclosure to boiler house upper roof (Level 6) and structural skeleton frame from ground level. Alterations to the east elevation of boiler house plant room at Level 2 to enlarge existing external wall opening. Demolition of existing Level 2 gantry platform and construction of new enlarged gantry platform. Proposed cantilevered extension to existing sampling room enclosure at Level 5. New access stair from Level 5.

Demolition of existing single storey elements (kitchen and toilet), rear boundary wall and art room. Change of use of No.25 from student accommodation to office accommodation. Construction of a new single storey link between No.21-24 Northampton Street and first floor rear extension at No.25; replacement of ground floor facade to No.21-24; alterations to Cripps Lane, car park and creation of new pedestrian route to the rear of No.21-25 including boundary treatments; installation of associated plant including PV panels and ASHP to roof of No.25; cycle parking and external insulation.