26 St Andrew Square, Edinburgh

26 St Andrew Square is a former classical house designed by William Chambers between 1770 and 1772, with additions made in 1840 and a rear rebuild by Peddie & Kinnear in 1878. The building has three storeys, a basement, and an attic, featuring a five-bay terraced design. It is constructed of pinned sandstone rubble with ashlar dressings. Architectural details include moulded architraves and cornices, a channelled mutual pilaster strip to the left, and a cill course on the first floor. At the centre, there is a Roman Doric columned porch with a mutulated cornice and blocking course, leading to two-leaf panelled doors. The centre and outer windows on the ground and first floors have bracketed pediments. The building is topped with a balustraded parapet with piers between the bays and features a pair of early slate-hung bowed dormers. The windows are timber sash and case with 12 panes, and the roof is covered with grey slates, complemented by stone stacks.

Inside, the original curving cantilevered stair by Chambers remains in the centre right, adorned with a cornice and a swagged frieze beneath an oval cupola. The interior also features 19th-century cornices throughout. The front left room is subdivided at a pilastered division and contains a fine small carved late 18th-century chimneypiece with marble slips. The rear left room has a panelled dado and a 19th-century timber chimneypiece. On the first floor, the front right room has a marbled stone chimneypiece, while the two-bay left room features a plain late 18th-century grey marble chimneypiece. The rear left room runs from front to back and showcases fine late 18th-century carved and gesso overdoors and a chimneypiece with nautical themes and original marble slips. A later 19th-century turned timber stair leads to the attic on the second floor. The building has been thoroughly refurbished for office use, including the installation of a lift.

The property is also adorned with cast-iron turned baluster railings.