Alltwalis Independent Chapel, including vestry to rear

This is an Independent Chapel, built in the 18th century and featuring a rear vestry. The chapel is constructed of stucco with a slate roof and simple bargeboards. The prominent gable front has a recessed arch in the centre bay, a sill course running along the first floor, and rusticated angle quoins. The ground floor features a large arched doorway flanked by pilasters and a moulded arch with a keystone. Double six-panel doors lead to a traceried fanlight, featuring three half-circles and two circles that echo the main window above. Flanked by cambered-headed windows with moulded hoods and keystones, the ground floor is complemented by arched first-floor windows; the side windows are narrow and two-light, while the central window is broad and three-light, topped with two roundels. The arched lights and roundels of the main window have marginal glazing bars. Moulded hoods link the arched windows with a moulded impost band. A roundel vent sits in the gable apex, and a date plaque is positioned above the door. The sides of the chapel are plain, two-storey structures with four windows each; the upper windows are arched, and the lower windows are cambered-headed. A single-storey vestry stands behind the chapel, with a door and two windows.

Inside, an ornate, curved-angled three-sided gallery is supported by iron columns with acanthus and scroll capitals and marbled shafts. A dentil cornice above the columns is interrupted by fluted console brackets supporting the projecting gallery front. The gallery front features a moulded cornice underneath long, horizontal panels arranged in two layers, separated by pilasters. The lower panels are vertically boarded with minimal stencilling, while the upper panels are intricate cast iron, ornamented with small pierced lozenges connecting continuous semi-circles within the top and bottom sections. The pilasters are fluted below a decorative panel, topped with a moulded rail. A clock is centrally positioned between two pilasters. The chapel holds pine pews arranged in three blocks. The square “set fawr” (communion table area) has a moulded rail and matching cast iron panels to the gallery. Panelled posts with ball finials mark the perimeter, and the platform is balustraded with steps leading up on each side, the newels mirroring the set fawr posts. The projecting pulpit front has canted angles and arched panels divided by column shafts; the panels are made of figured wood above a panel of vertical boarding with some stencilling, all topped with a dentil cornice. A broad, plastered arch sits behind the pulpit, featuring fluted pilasters and a moulded arch with a keystone. A marble memorial commemorates past ministers and building dates. The gallery includes raked pews with boarded backs, curved to follow the line of the gallery, and contains two doors leading to a lobby, as well as a central window. The ceiling features a deep cove and a boarded main section with a decorative border. The main part of the ceiling is rectangular, with diagonal ribs and a central, narrow rectangle; the border and center both feature square, pierced vents.