Y Gelli (formerly Grove House and also Ty Nant)

Large, elegant town house of roughly T-plan. Of red/brown brick construction, partly on limestone rubble foundations, with renewed slate roofs, hipped to the main section. This, the street-facing block, is a two-and-a-half-storey 5-bay building with symmetrical facade in Flemish bond and with sandstone quoins, plinth and string course, all now painted. The central (entrance) bay is slightly advanced and has a moulded doorcase via semi-circular stone steps, with fluted pilasters and modern 6-panel door; plain rectangular overlight. Tall 18-pane sashes, all modern horned replacements, flush-set with flat arches and projecting keystones. Heavily-moulded modillion eaves cornice and 3 large hipped dormers to the roof. These are c1900 and have 12-pane casements and similar heavy cornices.

To the rear of this main block are 2 large gabled lateral chimneys, that to the R partly incorporated in a later projection. These are Elizabethan and are of rubble with 3 grouped, offset brick stacks having moulded cornices (those to the left-hand chimney replacements of c1900). Between the two is a hipped-roofed stair projection. Irregular brick rear range nearly full height, with some small-pane casement windows, mostly modern replacements. Pebbledashed gable to rear range with modern fire-escape to the inner return and catslide and gabled additions to the outer. An inset sandstone plaque to the rear of the primary block is inscribed: 'Repaired by T E S 1693'. A companion plaque, recorded by Williams (1856), and inscribed 'Builded by Hvgh Clovch 1574', is lost.

Central entrance hall with flanking main rooms and stair partly contained in a projection to the rear. Very fine wide oak staircase of narrow well form, with the balustrade returned to form a short first-floor landing. This has fluted columnar balusters and a swept, moulded rail, scrolled at the bottom and with fluted columnar newel; panelled stair dado with fluted pilaster, moulded dado rail and large fielded panels. On the landing is a c1900 stained glass window with coloured foliate decoration and central quatrefoil motif having an heraldic crest with garter and Latin motto. The main ground floor room to the R has plastered wall panels and dado of c1900. 1690s moulded cornice and fireplace, the latter with flanking fluted pilasters and wooden lugged and fielded surround; expressed keystone and dentilated and heavily-moulded cornice with mantelpiece. Late C18 reeded iron grate. Primary (Elizabethan) partition trusses of Queen Post type to the attic floor, with pegged joints and stopped-chamfered purlins.

The building has extensive modern internal partitioning.