Bryn Seion Presbyterian Chapel

Single storey classically-derived design in local red brick with main decorative features, eg pilasters, cornice and surrounds, in terra-cotta. 3-bay front with pedimented gable; bays divided by plain pilasters and pediment broken by key-blocked arch springing from inner pilasters. Tall round-headed window to each outer bay; round-headed doorway with small triple round-headed windows above to central bay. Paired 3-panel doors with semi-circular fanlight. Spandrel panel to pediment arch made up of floriated terra-cotta tiles, with a stone name-plaque in centre. Terra-cotta ball finials to pediment and string-course. 3-bay return elevations with tall round-headed sash windows to generally simpler design. Single storey schoolroom, also in red brick, attached to rear of chapel.

Generally unaltered save for removal of pews. Entrance lobby, with decorative ceramic tile dado, recessed into body of chapel. Flat floor. Plastered walls with inscribed 'ashlar-work' and pine dado; stone arch behind pulpit. 3-bay plaster ceiling with decorative ceiling roses surrounding wood ventilators; ceiling bays separated by pine boarding. Carved wood pulpit and deacons' 'great seat'. Plain school room at rear wih timber roof trusses; staging has been removed.