Detroit & St Vincent block at Maindy Barracks

Two parallel 2-storey 19-bay wings joined by an added 2-storey gabled wing set between them. Of coursed rock-faced Pennant sandstone and freestone bands and cornice, and slate roof behind coped gables on moulded kneelers. The windows are all replaced in original openings. Each main wing faces E, Detroit on the E side and St Vincent behind it, and is symmetrical with the 3 central bays under an advanced gable. The Detroit wing has a central doorway with double boarded doors and round-headed overlight, paired windows in the bays R and L, under relieving arches in the upper storey, and a tripartite window upper centre with stone mullions and round-headed tympanum with plate tracery. It has a round clock in the apex with dressed surround and regimental motto on corbels. There are 8 bays L and R of the central gable.

The gable ends have external stacks cut down beneath the apex, and flanked by narrow vents in the gable. The rear of the Detroit wing has 9 bays either side of a central link, with windows similar to the front, added escape door with stair upper L, and doorway inserted in the bay set back from the L end. The link between the 2 wings is comprised of single-bay projections with roofs behind coped parapets, and a 3-bay gabled wing between. The front of St Vincent is similar to Detroit, with the link occupying the central bay, as are the gable ends. The rear of the St Vincent block has 8 bays either side of narrow V-shaped bays flanking a shallow lean-to to the centre with replaced double doors under a relieving arch and tripartite window above with mullions and transom.