3, Union Passage

No. 3 Union Passage is a shop with accommodation above, dating from around 1806, with alterations made in the late 20th century. The building was likely overseen by City Architect John Palmer, but it incorporates earlier elevations from around 1791 by Thomas Baldwin. It is constructed of limestone ashlar and features a Welsh slate roof that is mostly hidden from view.

The building has a single depth plan and is back-to-back with No. 23 Union Street, which has been redeveloped. It stands three storeys tall with an attic and has three windows, all of which are late 19th-century plain sashes set in plain reveals, with the central window on the upper floor being blind. The shopfront was updated in the late 20th century, and there is a cornice and parapet above.

The interior of the ground floor does not retain any notable features, and the rest of the interior has not been observed. Historically, this building was part of an improvement scheme for the city centre following the Bath Improvement Act of 1789. Union Passage is a street that has existed since the Saxon period; it was previously known as Cox Lane and is depicted on Smith's Map of 1588.