William Day was an Irish architect and builder active in the southeast of Ireland

Ireland

Ireland is an island to the northwest of continental Europe. It is the third-largest island in Europe and the twentieth-largest island on Earth...

 in the late eighteenth and early nineteenth century. He was related to architects John Day (architect)

John Day (architect)

John Day was an Irish architect and builder active in the southeast of Ireland in the nineteenth century. He was related to architects William Day and Martin Day , both of County Wexford.-References:...

 and Martin Day (architect)

Martin Day (architect)

Martin Day was an Irish architect and builder active in early to mid-nineteenth-century County Wexford and County Waterford, in the southeast of Ireland. He was related to architects John Day and William Day , both of County Wexford, and connected with Richard Purcell...

, both of County Wexford. His only known design was for the replacement St. Mary's Church of Ireland Church

St. Mary's Church, Kilmore, County Wexford

St. Mary's Church of Ireland Church is the parish church of Kilmore, County Wexford in the southeast of Ireland. The church was built to designs of William Day between 1798-1802 with a tower added in 1889, annexe in 1898, and later vestry in 1935....

, Kilmore, County Wexford

Kilmore, County Wexford

Kilmore or Killmore is a village and townland in south County Wexford, Ireland, about from Wexford town. Kilmore has a number of claims to distinction, including the tradition of carol singing in the village church at Christmas time, which has been taking place for over 200 years. The history of...

(1798–1802), although he was not responsible for the tower (1889), annexe (1898), and later vestry (1935).