20 Market Street

20 Market Street is a large corner block of shops and offices built around 1915-1920 by William Griffiths of Llanelli. Designed in the English Baroque style, it stands three storeys tall with an attic and features a domed corner. The ground floor is constructed with brown glazed brick piers, while the upper floors are made of red brick adorned with extensive dressings in matt grey faience that mimic stone. The building has a slate roof and brick ridge stacks, with plain rear elevations made of rubble stone.

The Market Street elevation has eight bays, arranged in a pattern of 1-6-1, while the Park Street side has seven bays, divided as 2-4-1. The ornate corner bay at the northwest angle is topped with a dome. The ground floor showcases channelled glazed piers between the shopfronts, with two narrower bays on Market Street that provide access to upper offices. Grey faience caps with pendant labels are positioned between the fascia panels, topped by a moulded cornice.

The upper floors feature slightly projecting flanking bays with channelled faience angle piers, moulded caps with pendant labels, and an overall fine moulded cornice with a pulvinated frieze that breaks forward over the angle bays. The windows are small-paned sashes in the Queen Anne style, linked vertically. The central bays have shouldered architraves and cornices, while the outer bays are embellished with pediments on brackets at the first floor and cornices on brackets at the second floor. The angle bay is fully clad in faience on the upper floors, featuring a canted two-storey bay, a main cornice that wraps around, broad front sashes with a pediment at the first floor, a flat cornice at the second floor, and narrow lights on the canted sides with plain cornices above.

The attic floor includes large lunettes over the flanking bays, with faience arches, a cornice, coping, and side piers. The red brick walling is complemented by a row of eaves that break between brick dormers, which are segmental-headed with faience keystones and coping. The dome at the angle consists of two stages: a lower canted section with one window and two faience piers, followed by an octagonal drum featuring scrolled faience angle buttresses, small square windows, and a leaded bell-cast dome topped with a wooden spike finial.