Calfaria Baptist Chapel, including railings.

Calfaria Baptist Chapel is a two-storey building designed in a simplified Romanesque style, notable for its minimal carved or moulded details. The main north front features a medium pitched gable with ashlar coping and a stepped ashlar raking course. The facade is mostly flush, lacking horizontal divisions, with flush ashlar quoins and window surrounds. The gable includes a stepped septuplet that is mostly blank except for a louvred centre light. The first floor showcases an unusual plate traceried centre window, which is a stepped quintuplet of plain arched lights, with the central three lights featuring roundels above and an arched hoodmould that steps down over the outer lights. The outer windows are two-light under a single arched hood. The ground floor has outer triplet stair lights that step up from inner to outer, with stepped hoodmoulds, and features two arch-headed doors separated by a narrower blank ashlar arched panel that holds an inset granite plaque. Above this panel is a recessed ashlar plaque that reads 'Calvaria Baptist Chapel'. The doorways and panel are moulded, with linked hoodmoulds—arched for the doors and gabled for the panel. Both doors are double and panelled. The side elevations have four windows over two storeys, while the rear includes a large blocked plate traceried rose window.

In front of the chapel, there is an embankment wall with cast-iron intersected oval rails, which extend to the right in front of the 1881 Sunday School and along Bigyn Road.

Inside, the chapel features a three-sided gallery with rounded angles and pierced cast-iron panels at the front. It is supported by four cast-iron columns. The wooden pulpit is adorned with a carved centre relief plaque and simplified Ionic columns, flanked by outer pilasters. There are iron 18th-century style flat balusters on each side and a curved 'set fawr'. Behind the pulpit is an organ with coving under the pipe front. The gallery walls are decorated with stucco pilasters featuring Ionic capitals, and the ceiling is panelled with coved sides, complemented by patterned stained glass.