Royal Horticultural Society Old Hall

The Royal Horticultural Society Old Hall is an exhibition hall and offices built in 1904 by Edwin James Stubbs. The forebuilding is made of warm red brick with extensive stone dressings and banding, topped with a slate roof. Behind it is a steel trussed glazed hall. The design combines elements of Free Style, mixing features from Norman Shaw and Arts and Crafts styles with Renaissance details. The building has three storeys above a basement, with a terrace in front of the area, a dormered mansard, and a two-storey attic above the central section.

The central part features a three-window arrangement flanked by two three-window ranges. A large porch with engaged Doric columns projects over steps leading to the pavement, featuring large double panelled doors and large side doors on either side. The ground floor windows are large, with wood mullions and transoms, pilasters, and cornice hoods, slightly parabolic in shape. The upper floors of the flanking ranges have two-light windows, with those on the first floor framed by pilasters and cornices, flanked by consoles. The centerpiece has a shallow, ashlar, through-storey tripartite bow.

The building has a large bracketed eaves cornice and secondary cornices on the attic of the centerpiece. The main cornice returns across shaped gable ends, which are topped with chimney stacks featuring extensive banding. The hall at the rear has a brick wall and a brick ground floor on the east gable end, with the upper part showcasing exposed steel lattice framed glazing, flanked by corbelled banded turrets. Inside, the hall features a gallery supported by Doric columns and a glazed tunnel vault roof on lattice girder trusses.