Sunday School attached to Bethania Chapel

The Sunday School attached to Bethania Chapel is a building with a 3-bay gable front made of coursed rubble, featuring a plinth and quoins. It has a slate roof and a bracket eaves cornice. At the top, there is a roundel above a giant arched central recess, which is the first example of this feature on a chapel façade. This recess is adorned with voussoirs and contains a date plaque over a tripartite window, which has oculi above each square-headed small pane light. The design includes keystones, imposts, linked labels, and an overall sill. Below, there is a round arched entrance with an impost band, double panelled doors with an architrave, a chevron arched band, and a carved stone tympanum symbolizing Evangelism. Small flanking lobby windows are present, and the outer bays feature tall round arched sash windows with marginal glazing bars and a stringcourse at mid-rail level. The façade continues around the corners and steps forward with bull-nosed quoins. The side elevations have 4 bays with sash windows, round arched over square-headed.

At the rear, the Ysgoldy hall is off-centre and set into the slope. It is a 2-storey building with a 4-window, cement rendered gabled front and tapered end pilasters, also with a slate roof. The chapel front is mirrored in the recessed giant arch at the centre, which contains 2 windows. All windows are sashes, round arched over square-headed, with labels on the first floor. There is a door to the right and a Chapel House beyond.

Inside, the chapel lobby features a ceiling rose and turned balusters leading to the gallery stairs. It retains an old platform with a set fawr against the front wall. The ceiling has 3 large panels with roses, surrounded by bosses and a dentil cornice. The raked gallery corner is supported by fluted cast iron columns with palm-like capitals and a collar band of a similar leafy pattern. The panelled gallery front includes pilasters with a strapwork design. The organ is positioned over the set fawr with arched panelling. The Ysgoldy has a canted ceiling with a large central rose and smaller ones at the ends.