Hall attached to Siloa Capel Y Annibynwyr

The building is a hall attached to Siloa Capel Y Annibynwyr, constructed in a simple classical style. It features a three-bay gabled front that is rendered and includes end pilaster strips, a stringcourse in the middle, and a cornice that creates a light pediment effect. An oval date plaque is positioned on the gable. The hall has a slate roof with wide boarded eaves, and the windows are round arched with keystones and fluted architraves, fitted with horned sashes that have marginal glazing bars. The central entrance mirrors the window style, featuring a round arched head with double panelled doors and a five-pane semi-circular fanlight.

The side elevations consist of four bays with camber headed sashes set in square openings. At the rear, the chapel hall is stepped down and has a steeper roof, with small pane sashes on the sides. The rear gable, which faces the river, is cement rendered and has a small octagonal chimney stack. It includes a round arched and boarded gable window flanked by circular four-pane windows, with four-pane sashes below. Projecting stones on the southwest corner suggest that another structure may have once been attached here.

The forecourt is marked by rubble piers topped with freestone caps that rise into ball finials at the gated entrance. The gates are inscribed with 'Capel Siloa' on the lock bar, and one of the piers features a commemorative tablet. Iron railings surround the area, with some uprights designed in a barley twist style.

Inside, the hall has a galleried interior with a herringbone boarded ceiling adorned with roses. The end bays originally had different ornamentation, which has since been removed to the front end. The raked gallery has a panelled and bracketed front supported by cast iron columns. The simple classical 'set fawr' includes quatrefoil punched newels capped by ball finials. The furnishings are made of pitch pine, providing seating for approximately 900 people. The attached vestry/hall features ceiling ventilators and a central rose.