The Costain Building, an iconic feature of the Rydal Penrhos campus, exemplifies the seamless blend of historical charm and modern functionality that characterises the school.

Built in 1927 and named after the Rev. A.J. Costain, a transformative headmaster who led the school for 37 years, this L-shaped two-storey structure embodies collegiate architectural elegance.

Positioned at the corner of Lansdowne Road and Queen’s Drive, the Costain Building features distinctive mullioned windows with intricate leaded panes. Its detailed Gothic elements, including traceried panels, battlemented parapets, and oriel windows with finely carved floral decoration, highlight its architectural sophistication.

Internally, Costain is a hub of academic excellence. The Queen’s Drive wing houses Language and Literacy classrooms, while the Lansdowne Road elevation is home to the Science faculty, including state-of-the-art Biology labs in the basement. This layout fosters collaboration among faculty members, ensuring pupils benefit from a cohesive academic approach.

Beyond its practical role, the building has inspired generations. Its well-equipped laboratories, coupled with the dedication of science technicians, provide a dynamic learning environment. Many alumni attribute their passion for STEM fields to their experiences in Costain’s classrooms and labs.

Rev’d A.J. Costain’s tenure saw transformative developments at Rydal, including the building’s construction. His leadership, especially during the school’s evacuation in World War II, solidified his legacy, commemorated in the building that bears his name.

If you would like to read more about the Costain building and its history, we would recommend you read the Colwyn Bay Heritage Online article about the building, which includes contributions from alumnus David Birch (RS 1965-70).