Built in 1896-97 by Grierson and Bellis, architects of Bangor. Illustrated (both with and without clock tower, and with minor differences of detail) in Building News, June 26 1896.

Constructed in the Free Northern Renaissance style, of rubble with pale freestone dressings and slate roofs. There is small pane casement glazing.
The main front faces southwest, having a central block with gabled cross wings to the ends. There is a central Renaissance cupola and red brick chimneys. the gabled bay to the left of the central block has a belcote in aedicule, with a pinnacled, semi-circular pediment and side volutes. The central first floor window has a freestone architrave entablature over it with smaller windows to the sides.

On the ground floor is a pair of small, tall windows with pedimented architraves. In the angle between the front and cross wing, a porch has a round-arched doorway with a freestone doorcase consisting of squat columns on plinths, columns support Mannerist hyperbolic pediment flanked by finials, and a square window to the right return. The porch inscription records the opening of the school on Diamond Jubilee Day, 22 June 1897.

To the right of the main front, a lower, shaped gable has a tall window with a curvilinear pediment flanked by smaller windows. The shaped gables to the right and left crosswings also have tall windows with smaller, narrow, windows to each side.

At the south angle is an octagonal tower, castellated with a slated spirelet and a clock. The NW face of tower has a loop, and a plaque recording the gift of the tower bells and clock. The angle of the building makes the transition from octagonal tower face to right angle via a broach stop.

There are three shaped gables to the NW elevation, each with tall window with pedimented architrave, and with smaller square-headed windows between gables.
The rear elevation has a central block with an entrance to the left, and a door surround to the girls' entrance as at the front. To the right of this, a larger shaped gable has a broad first floor window, and two windows to ground floor. To the right of this is a lower shaped gable with tall window flanked by lower windows. To the right of the main block is a shaped cross gable with a loop and tall window flanked by lower windows. To the left of the main block is another shaped cross gable, the ground floor with a later flat-roofed extension with square-headed windows.

(Source: Cadw listing database) S Fielding RCAHMW 22/05/2006