4, Tombland

No. 4 Tomland is an 18th-century house incorporating a 15th-century undercroft. The house is constructed of red and blue brick, with vertical blue brick bands between the windows. The ground floor is rendered, and the roof is not visible. The building is three storeys high and has three bays. An off-centre, panelled and partly glazed door is topped by a flat hood supported by simple consoles. Sash windows with glazing bars and segmental arches are present throughout. A brick eaves cornice runs along the top, above a parapet.

Beneath the house lies a brick undercroft, divided into three irregular bays. Each bay features single-chamfered, diagonal ribs, cross-ribs and wall arches. The ribs spring from brick T-shaped corbels. Three of the four side chambers remain, along with the entrance arch. This building is designated as a Grade II* listed building due to the significance of its undercroft, which is one of a small and important group located within the city walls.