Magistrate's Court

The Magistrate's Court is a two-storey building with an irregular plan, constructed in red brick featuring blue and black brick banding and dressings, along with a stone plinth. Some areas have slate hanging, and the roof is adorned with banded fishscale tiling and a red brick chimney stack. The main façade has two windows with casement glazing. To the left, there is a tall gable with an implied truss at the apex, beneath which are paired lancet windows set under a relieving arch made of banded brick, accompanied by a similar impost band and freestone imposts and cills. The ground floor features a three-light window with a cambered head and banded voussoirs, while the right-hand ground floor window, originally similar, has been replaced with a modern insertion.

Attached to the right is a single-storey range that shares similar detailing and includes an inset red 'VR' letterbox. A boarded door leads into a passage that opens into a rear yard, which has undergone modern alterations. The left side of the building, facing down New Street, is mostly slate hung on the first floor, and a two-storey bay projects from this side, featuring a half-hipped gable with a finial and stilted window heads. The ornate main door is located at the right-hand side of this bay, characterized by a tall and chamfered opening with polygonal imposts. Above the door is a freestone tympanum inscribed with the coat of arms and the text "Llanidloes Lock-up Erected AD 1864," leading to a boarded door with ironwork.

At the rear, there is a taller range that contains the courtroom, which features two conical ventilators on the roof and has had outside stairs added in later brickwork. The rear gable end includes two sash windows. Inside the courtroom, the structure boasts trusses with intersecting principals and iron tie bars.