21 Colliergate is a historic building in the city centre of York, in England.

The site on Colliergate has been in use for many centuries. There are some fragments of Mediaeval timber framing visible in the side walls of the ground floor, while on the second floor there is timber framing visible from around 1600. The house was rebuilt in the early 18th century,^[1][2] and in 1732 it was converted into Margaret Mason's Hospital, an almshouse for six widows.^[3] In 1783, the front and rear walls were demolished and rebuilt in brick, then in the mid-19th century, the heights of the floors in the front were raised, to match those in the rear.^[1] In the 1940s, the almshouse was altered to provide five bedsit rooms, but it closed by 1958 and was later converted into a shop.^[3][4] The building was grade II listed in 1968.^[2] The original doorframe was destroyed when the shop was burgled in the 2023, following which the tenants applied for permission to install a steel gate.^[5]

The building has a timber framed core and external walls of orange-pink brick, with a slate roof. It is three stories high and a single bay wide. The front has a gable. On the ground floor are two doorways, one to the shop and one to a passageway, and a shop window with small panes, below a cornice. The upper floors each have a single sash window. Inside, a staircase installed in the mid-19th century runs the full height of the building.^[1][2]

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53°57′34″N 1°04′46″W / 53.9595°N 1.0794°W / 53.9595; -1.0794