Groesffordd Marli Chapel

Groesffordd Marli Chapel is a simple rectangular gabled chapel built from limestone rubble, featuring finely-tooled limestone dressings. The front and left side have grey roughcast, and the chapel has a slate roof with plain bargeboards. The facade is symmetrical, with tall paired arched windows at the center and arched entrances on either side. The windows contain original 18-pane recessed and unhorned sashes with segmentally-glazed heads, limestone voussoirs, and projecting stone cills. The entrances are also arched and include deeply-recessed 6-panel double doors with simple 3-part fanlights above. Each side of the chapel has three 18-pane square-headed windows, although those on the northwest side are replacements. At the rear, there is a single-storey early 20th-century extension made of rubble with a pitched slate roof, which features a boarded door and a 6-pane window to the left, along with a plain brick external chimney. Flanking this extension are low WC additions from the late 20th century. The eastern end has two original windows, similar to those on the front.

Inside, the chapel has simple fixed, tiered pine pews and a Set Fawr with a tripartite architectural back and a segmental top. The ceiling consists of three sections, with the central part being segmentally-vaulted and adorned with moulded plaster-ribbed coffering. Flanking the Set Fawr are leaded inner lights in the windows, designed in the Art Nouveau style.