20 Great Oak Street

20 Great Oak Street is a mid-19th century building inspired by late Georgian architecture. It is a three-storey structure featuring a one-window front design arranged in reflected pairs. The front is finished in scribed cement render with a plinth and quoins. The building has an overall slate roof with wide bracket eaves and blue brick chimney stacks. The windows are horned six-pane sash types, while the shop windows are mostly four-pane with cornices. There have been modern alterations to No 19. Alderson's, located between Nos 19 and 20, has a broader full-width shop front with a plate glass window and end pilasters beneath an overall cornice. The doors are part glazed, except for No 20.

No 17, which returns around the corner into High Street, has a similar scribed cement render elevation, horned six-pane sashes, and a modern small shop window. To the left, Nos 45 and 46 High Street adjoin beyond a round arched opening leading to a passage for the rear yard. This arch features an architrave, keystone, and a boarded door. The right-hand gable end and rear elevations are slate hung with casement windows, and there is a modern single-storey brick cross range. A tall brick stack is located at the rear of Nos 45 and 46, which also has some metal frame casement windows. The first and ground floors are constructed of rubble, with a brick lean-to.

The cobbled yard is enclosed to the south and west by brick outbuilding ranges, which have small pane metal frame windows with cambered heads. The western range serves as the cross range to No 22 Great Oak Street.