Harold Street Junior School bears the dates 1897 and 1910. It was probably designed by E A Johnson. Laboratories were added to the rear of the school in 1907. The building provided accommodation for the Intermediate Girls' School following the Welsh Intermediate Education Act of 1889, and was then the County School for Girls, but it is now a primary school. This is a little altered example of a developed Board School.

It is built of yellow brick with Bath limestone dressings on grey stone plinth with a red tiled roof with tiled cresting, yellow brick chimneys and cast-iron rainwater goods. It is built in a Tudor style with some Jacobean details. It is generally a single-storey complex with large, high classrooms in the Victorian manner and only the later Science Block at the rear is two-storeys. It has horned small pane sash glazing set in mullion-and-transom windows.

Source:- Cadw listed buildings, NJR 14/09/2010