Conversion of upper floors of building to create 2no. flats including erection of external access staircase and rear dormer

Internal/external alterations to building including erection of 2/3 storey rear extension, rear dormer and external staircase to create 2 no. apartments on upper floors and use of ground floor retail unit (Use Class A1) as flexible commercial unit (Use Class A1/A2/A3/A5/B1) including erection of brick extraction flue