21 Main Street, Limavady, Co Londonderry, BT49 OET

21 Main Street, Limavady is a two-storey rendered terraced house dating from the 1840s–1850s, located on the south-east side of Main Street. It is four windows wide and sits beneath a slate roof with two small roof lights and a brick chimney at the south-west end of the ridge, which is slightly lower than the adjacent 19 Main Street. Cast iron rainwater goods are present.

The building is particularly valued for its fine Georgian-style entrance door-case and the survival of historic windows, which contribute positively to the character of Main Street. The first floor features four equally spaced twelve-pane sash windows with painted stone cills. The ground floor showcases a large Georgian entrance door recessed within the facade and aligning with the north-west window. The door is flanked by Ionic columns recessed in the facade, which support an entablature decorated with a geometric fret pattern and a flower head in a break front above the capital. The double panelled doors are 1.2 metres wide. Above them sits a semi-circular fanlight of high quality, featuring a complex pattern of curving astragals forming a succession of ellipses and approximately triangular panes. A plaster bead moulding edges the entire opening. Flanking the entrance on either side are two approximately square windows, each divided into four vertical divisions with crude curving heads and glazed in a Georgian pattern. The other ground-floor openings are more recent additions with concrete cills.

The building appears on the 1830 Ordnance Survey map, likely indicating its construction within that period. According to the 1858 Griffiths Valuation, the house was occupied by Hugh Lane and leased from J Ogilby. The return of this building was originally paired on the 1830 map with the adjacent site (now 17 & 19), which was of exactly the same size; that site is now occupied by later Victorian buildings.

The conversion to shopfront use and the loss of all architectural character internally and to the rear represents a significant loss to the town's built heritage. The rear of the building has been replaced with a modern flat-roofed extension occupying the whole plot to the Department of the Environment car park behind.