It is built in red Ruabon brick with terracotta dressings, and has a red-tiled roof with a finial at the east end.
The chapel consists of a nave and chancel in a single range, an apsidal east end, and a west bellcote.
[4][5] Extensive building work to expand the school's facilities was carried out between 1890 and 1893; this included construction of a dining room, dormitories, bathrooms, a swimming pool and a covered playground.
The frontage of the school on The Parade, Parkgate, was buttressed and decorated with its distinctive black and white appearance in 1932.
[6] Sir Wilfred Grenfell (1865–1940), medical missionary to Newfoundland and Labrador, was born in Parkgate and was a pupil at the school.