Horeb's congregation, or cause, was possibly established in 1797 and the chapel was certainly first built in 1791. This was rebuilt in 1827 and again in 1865, the later to the design of architect R G Thomas of Menai Bridge. The present chapel, dated 1865, is built in the Italianate style with a hipped-roof 'box' in form and smple gothick tracery on the front. To the north-east (right) is a single-storey Sunday School with domestic, or Vernacular style windows, built in 1892 at a cost of £450 to build. To the left (south), nearer the road was a caretaker's house constructed in 1865 (G.Jones,'Capeli Mon',111). The interior has a large platform-pulpit (backed by a classical arch) and set fawr for the deacons at the far (north-western) end of the chapel, there are internal wooden lobbies to the twin doors and a simple wooden-boarded flat ceiling divided into separate fields with three central ventilation vents. This is a fine example of a large mid-nineteenth-century 'hipped box' chapel, an intermediate form between early long-wall and later gable-ended 'show-front' chapels. It is an important work of the known chapel architect R.G.Thomas of Menai Bridge / Porthaethwy.

RCAHMW, July 2008.