Pisgah Trefnyddion Calfinaidd (Chapel) including forecourt walls, railings and gates

The Pisgah Trefnyddion Calfinaidd Chapel, built in the 19th century, is constructed of snecked rockfaced sandstone with ashlar dressings and an artificial Welsh slate roof with ridge tiles. The main front is a three-dimensional gable facade of two storeys and three window range, featuring projecting gabled side bays that form a central entrance bay. The main gable has three round-headed windows linked by a continuous hoodmould incorporating three keystones; the central window has three lights, all with small coloured glass quarries depicting floral motifs. Above the windows is an inscription panel, and below the apex, a keyed oculus. A deep decorative eaves cornice is surmounted by three orb finials supported by three decorative corbels. Each side bay has a steep gable topped with a smaller orb finial, wide channelled piers, a tripartite coloured glass window with hoodmould and keystone, a heavy moulded sill band, and ashlar bands above; a dedication panel sits below. The central bay holds a pair of round arched ashlar doorways with a heavily moulded arcaded parapet above, and a pair of double twelve-panelled doors with overlights featuring coloured glass motifs. The side elevation, built of rubble, is six bays long and includes round-headed windows with six-over-six pane sashes with coloured glass overlights at gallery level, and square headed windows below. The end left was blocked to accommodate an added entrance outshut. A range of school buildings is attached to the rear.

The forecourt is divided into two levels. The front boundary wall is constructed of snecked rockfaced stone with red millstone grit coping. It incorporates five tall entrance and side piers with pyramidal capstones, and two diverging flights of stone steps lead to a walled entrance terrace. Two designs of iron railing are present: a low railing of interlinked roundels with deep finials at the front, and a taller railing with fleur de lys uprights to the gates and upper terrace. An Ordnance Survey map from 1877 shows the central entrance and steps, while a 1920 edition depicts a terrace.

Inside, the vestibule features a pair of coloured glass interior lights, polished woodwork, and opposing staircases with decorative balusters. A planked dado runs along the walls, and a mosaic floor is present. A four-sided raked gallery, with pews of single lengths of wood, is supported by nine slender cast iron piers. The front of the gallery is highly decorative, featuring different hued polished woods and plaster mouldings, particularly delicately moulded coving with an acanthus motif and stencilled soffit. A richly moulded platform supports a polished wood pulpit and a “set fawr” (pulpit platform), above which is an organ installed by Norman and Beard in 1906. The ceiling is painted with diagonal boards incorporating roses and ventilators. A rear wing houses a vestry, Sunday School, and library, retaining planked dados, woodgrained four-panelled doors, and margin glazed sash windows. This wing incorporates the curved end wall of the chapel.