The chapel lies at a raised level within the cliff face alongside the river. The ‘east’ end in effect points south-east. It is c. 6.2 m long, and 2.3 m wide.
At the east end is a rock-cut altar.
At the west end there is an entrance from the exterior, and opposite it, the doorway into the sacristry.
The ceiling consists of three sections with mock vaulting. In the central section is a rock-cut basin.