Gelli Gynan Hall

Gelli Gynan Hall is a country house comprising two distinct phases of construction, with an earlier, lower range located at the rear and a taller addition built in 1868 to the front. The 1868 eastern addition is roughly square, standing tall over two and a half storeys with paired gables facing the front. It is finished with whitewashed roughcast walls contrasted by ashlar dressings and covered by a slate roof. Distinctive Jacobethan detailing includes sandstone ashlar mullion windows, and ashlar copings, finials, and tall modelled stacks, one on the north side wall and one on the southwest rear gable. The front elevation is arranged as a two-window range, displaying balanced asymmetry. Matching two-light, hoodmoulded attic windows are present, though the first floor left features a small single light and the right incorporates a large three-light mullion-and-transom window, both with prominent hoodmoulds. A string course runs above the ground floor, complemented by a two-step buttress, with the string course extending above a first set-off. A three-light mullion-and-transom window is positioned on the ground floor left, while a large, square, enclosed porch projects to the right. This porch is topped with an ashlar parapet featuring a central monogrammed plaque, possibly denoting ‘C & I J’. Flush ashlar quoins are accentuated by short diagonal buttresses, and the front doorway exhibits moulded pointed details and a hoodmould, incorporating a plaque displaying a boar's head crest and a motto in Welsh. The south side showcases a large, two-story canted bay window with a four-light mullion-and-transom window on each floor, accompanied by string courses and a top ashlar parapet punctuated by pointed arcading. An eaves breaking two-light mullion window sits above with a hoodmould, beneath a coped gable. The southwest corner features a shorter two-step buttress.

The older section of the house, to the west, is arranged in an L-plan facing south and west, with 20th-century replacement windows. It is two stories high with a lower pitched roof, displaying coped, shouldered gables on the right side, the south end of the south range, and the north end of the west range. Short, cemented stacks are present, mimicking diagonal shafts and topped with flat caps, one on each ridge. The south front has stuccoed, hoodmoulded windows, likely altered mid-20th century when metal windows were installed. A gable on the right side has tripartite windows; the lower one incorporates a door where the centre window would have been. The range to the left has two windows upstairs and three downstairs, all under a long hoodmould. The west garden front retains more original detail, featuring sandstone dressings and 20th-century small-paned window replacements. This front's gable showcases a hoodmoulded window on each floor, with a casement-pair above and a longer cross-window below. A projecting, full-height bay with a moulded ashlar cornice and parapet rises along the left side, featuring a tripartite window on each floor, the lower one a French window. The ground floor of this range is set within a finely-detailed Gothic loggia, also canted-fronted, across three bays, with a particularly wide centre bay featuring an ashlar entablature and cornice. An embattled parapet tops the loggia, supported by four thin quatrefoil Gothic columns with shaft rings, the outer pair attached to short ashlar return walls pierced with a pointed window. To the left of the left gable, additions, likely dating from the early to mid-20th century, echo the existing style with flush stone frames around the windows. These consist of a narrow, two-story, one-window section, and a single-story range with a coped parapet.