Ponterwyd Calvinistic Methodist Chapel and attached chapel house

The building comprises a Calvinistic Methodist Chapel and an attached chapel house, dating from the 18th century and expanded in 1854. The chapel is constructed of colourwashed stucco with a slate roof that overhangs, featuring brackets to the gable verges and side eaves. The broad gable front has two arched windows and a pair of arched doors. A lunette plaque above the windows reads: "Capel Ponterwyd Adeiladwyd yn y flwyddyn 1800, ac a helaethwyd yn y flwyddyn 1854" (Ponterwyd Chapel, built in the year 1800, and extended in the year 1854). The small-paned windows have Georgian Gothic intersecting glazing bars in their heads. The doors have five long panels with pointed heads, a detail also found at the chapels at Ystumtuen and Llywernog, and are topped with plate glass fanlights. All arch heads are painted.

Attached to the right side of the chapel is a lower chapel house. It has a 20th-century door to the extreme left and plate glass sash windows on each floor to its right. A black brick chimney stack is located on the end, with a rendered right end wall and a brick chimney on the rear roof slope.

The right side wall of the chapel, behind the house, is rendered and features a single 24-pane sash window. The left side wall is constructed of rubble stone and contains three similar windows with stone voussoirs. The broad rear gable also has three similar sashes. A boarded door, with stone voussoirs, is set within the gable.

The chapel interior is broad and near-square, without galleries. It contains four blocks of painted, grained, numbered box pews, arranged up towards the back in nine steps, with ramped top rails. Two blocks of inward-facing pews are situated between the lobbies and a large central seat. The pews are painted pale yellow with a red-brown top rail, and are pale brown internally. They have plain panel backs, but moulded surrounds to the more prominent front and end panels. Bench seats with shaped bench ends are positioned in front of each block.

A later pulpit and a substantial great seat have been added. The great seat features turned newels; the side benches are constructed from parts of the original pews, and the main bench, facing the pulpit, has turned balusters to the back. The pulpit has a panelled front with contrasted graining, with the centre section projecting forward and incorporating a bookrest on brackets. Short steps with a turned newel, ball finial, and one turned baluster lead up to the pulpit from each side. The pulpit-back is a large, plain, arch-headed panel.

The lobbies are later additions, boarded with small-paned overlights above double doors. The ceiling is plain plaster with no cornice, and features an acanthus rose within a moulded ring at the centre, along with four plain roundels.