Hezlett House is a 17th-century thatched cottage located in Castlerock, County Londonderry. Built around 1691, it is one of the oldest buildings still in use anywhere in Ulster. The cottage has a cruck structure and is situated at the crossroads near the village. It was originally a rectory or farmhouse. See also Downhill Estate References Inline Other National Trust properties in Northern Ireland Buildings and structures in County Londonderry Tourist attractions in County Londonderry Grade A listed buildings Historic house museums in Northern Ireland