1760 - 1780
Detached square-plan five-bay two-storey country house, built c. 1770, with hipped slate roof with brick chimneystacks. Roughcast rendered walls. Square-headed openings having six-over-six pane timber sliding sash windows and limestone sills. Render architrave to first floor, centre bay. Square-headed opening to south elevation, first floor, centre bay with six-over-six pane timber sliding wash window with flanking two-over-two pane windows. Round-headed opening having render surround comprising Ionic style engaged columns with scrolled consoles supporting architrave. Spoked fanlight over timber panelled door with flanking sidelights and Ionic style engaged columns. Three-storey roofless circular rubble stone folly within demesne. Gable-fronted two-bay single-storey gate lodge to south-east having extensions to rear. Hipped slate roof with rendered chimneystack. Rusticated limestone walls with roughcast rendered walls to gable apex. Square-headed openings having timber casement windows. Recessed opening with timber panelled door. Pair of lined-and-ruled rendered square-profile piers with carved limestone caps, double-leaf cast-iron gates and flanking square-headed pedestrian entrances having limestone copings, single-leaf cast-iron gates terminating in second pair of piers. Roughcast rendered walls with limestone copings terminating in pair of square-profile limestone piers having carved caps.
Derk was the family home of Heffernan Considine, who was Deputy Lieutenant (D.L.) of County Limerick. It was also the boyhood home of Father Daniel Considine SJ, author of 'Words of Encouragement.' The form and design of this imposing country house are typical of such high status structures built in the late eighteenth century. The arrangement of openings to the front elevation is distinctive, reflecting a tripartite division internally. The subtly diminishing windows are typical of the neo-classical fashion. In the case of Derk, the fenestration gives the house a strong emphasis to the horizontality of the structure. A notable structure within the demesne is the circular folly, a structure which is intrinsic to many demesnes. The gate lodge, despite alterations, retains its original form and structure. The piers and gates at the public road are notable for their decorative features such as the cast-iron gates and limestone dressings.