Dinsdale Park Residential School

Dinsdale Park Residential School is a former spa hotel, built in 1829 by Ignatius Bonomi for John Lambton, Lord Durham, with mid-19th century additions at the rear. The building is constructed of pink brick in Flemish bond with stone dressings and has Welsh slate roofs featuring brick chimney stacks. The additions are positioned at right angles to the main block, including a two-storey wing on the right rear, a double span in the centre rear, and a single-storey wing on the left rear. The building is designed in a classical style.

The main block is three storeys high and features a symmetrical facade with 1:2:1:2:1 bays. The end bays are framed by brick pilasters, while the centre bay is canted. There is a stone plinth, a first-floor sill band, an eaves cornice, and a parapet. A four-panel door with an overlight is set within a late 19th century roughcast stone porch located in the bay to the right of centre. The end bays contain tripartite sashes, with 15-pane sashes on the ground floor, 12-pane on the first floor, and 9-pane on the second floor. The cornice and parapet project forward over the pilasters. The roof is low-pitched and hipped, featuring transverse ridge stacks. The left return has three bays, while the right return has four bays, both displaying similar architectural details.

The two-storey, eight-bay wing on the right rear has 16- and 20-pane sashes beneath segmental heads, as well as two-storey canted bay windows in the end bays and a low-pitched hipped roof. The three-storey, four-bay double range at the centre rear features sashes and a low-pitched two-span roof. The one-storey, four-bay wing on the left rear has altered windows and a flat roof, along with a large ashlar porch with Tuscan columns at the junction between the wing and the main block.

The interior has been altered in the late 19th and 20th centuries, but some features remain, including six-panel doors with wood architraves, panelled window shutters, and ceiling cornices with Greek-Revival motifs. Extensive 20th-century rear additions are not of interest.