Exterior
Consists of library block (to R) of 9 windows, clock tower of one bay, public offices block (L) of 7 windows. Edwardian Baroque. Two storeys and attic; basement and area railings to public offices. Red brick, bathstone dressings, channelled bathstone ground floor; plinth of local stone.
Library has bathstone frontispiece, giant Ionic columns; attic has open pediment with oculus, 4 windows; on first floor central open pediment over tripartite window, keyblocked sash windows to sides; ground floor has central round-headed doorway flanked by round-headed windows. Outer bays of library block have to first floor, 3 windows in keyblocked architraves, to ground floor, 3 round-headed windows (but first bay has doorway with keyblock breaking up into pediment).
Clock tower has copper dome with louvres, diagonal buttresses. Channelled quoins, cornice runs above clock faces; on first floor, window in aedicule; on ground floor, round arched window.
Centre bay of public offices comprises a frontispiece with giant paired Ionic columns and an open segmental pediment, Venetian window on first floor centre light surmounted by a cartouche in full relief with flanking female figures personifying Justice. Steps up to a doorway with rusticated Ionic columns, and segmental pediment inscribed ''Public Offices''; each side of the steps the pedestals break forward to bear a seated stone lion with cartouche between its front paws. Outer bays of offices block have to first floor, 3 windows in keyblocked architraves, to ground floor, 3 round-headed windows.
Side elevation (L) of 5 bays, the first 2 bays similarly articulated to the flanking wings of the front elevation the furthest 3 bays comprise a frontispiece with pediment, giant Ionic pilasters, 2 windows to central bay, single windows to outer bays; on ground floor, arched windows to ground floor, central window broader. Tympanum of pediment has carved relief with a central cartouche inscribed ''BTC'', female figures, and miniature ships.