Exterior
The style is a simplified Tudor Gothic, rendered (with minimal use of ashlar) slate roofs and ridge stacks (rebuilt since in black brick). The 4 ranges cross at the angles to give a more picturesque corner treatment with projecting coped and shouldered gables set in slightly from the ends of the ranges and the S front has a flush entrance tower. Within the quadrangle are corner stair towers capped above eaves level with an octagonal shaft and lead ogee dome and the N hall and chapel range is elaborate with a big centre gable and long first floor windows to the library. The windows throughout are cast-iron, small paned and flat-headed, with Tudor-arched heads to each light, generally 2-light with painted cast-iron frames, but larger mullion-and-transom lights to end gables and small plain casement pairs to gable attics. Gables have stepped diagonal buttresses, main ranges have a moulded ashlar plinth at sill level, hoodmoulds to ground floor windows on outer facades, a continuous dripcourse over upper windows and a bigger ashlar moulded eaves course interrupted by painted cast-iron bosses with rosettes, a JSH monogram, or the college arms. Within the quad the walls of the 3 accommodation ranges are roughcast, not lined stucco, and there are no ground floor hoodmoulds. The staircase entries are unmoulded Tudor arches.
Outer Facades: S facade of 1-5-1-5-1 bays has centre ashlar 4-centred archway with narrow oriel above, and tower with attic window, stringcourse, recessed plaque with Hanoverian arms and battlemented parapet. The courtyard face of the tower is simpler, with 3-light mullion and transom window at first floor and no armorial plaque. The archways have hoodmoulds. Within quad simple 4-1-4 bay elevation with doors in second bay each side of centre and then in corner 3-sided towers. Quad E and W sides are plain 8-window range with 2 doors, while outside W front is 1-9-1 bays, similar to S but without centrepiece and with porch to Principal's house in angle to NW gable. Outside E front is considerably plainer, 1-8-1 bays, the gables ends quite utilitarian.
Quadrangle: S front has big shallow centre gable with flanking buttresses carried up to curious chimney-like finials, apex clock, 2 long 3-light mullion-and-transom windows each side of a canopied statue niche with modern Saint David statue and squat 4-centred doorway with ogee hoodmould. Hall and chapel ranges are set back each side behind a 4-bay cloister, now glazed. Plain 4-centred arches, buttresses between, and parapet with battlements over buttresses. Hall has original 2-light mullion-and-transom windows to match those elsewhere, while chapel was remodelled 1879-80 by T G Jackson and given 4 Perp Gothic stone traceried windows. Spine range running N ends in N similar but plainer frontispiece shallow gabled with side buttresses carried up, apex roundel, first floor big 6-light window and ground floor 4-centred arched doorway. Two-window wings each side with mullion-and-transom 2-light windows and coped shouldered end gables. Basement under right wing. Wings screen utilitarian rear of chapel and hall ranges and plain N gable of E range. N gable of W range matches those elsewhere, but with basement storey. Flat roofed addition to Principal's house in NW angle.