Seamount House was built by the Butlers of Cregg in the 18th century. O'Connell notes that Seamount was the residence of Maj. Theobald Butler, who had fought at the Battle of Waterloo, during the 1820s. At the time of Griffith's Valuation Denis Hynes was leasing from Edmund Donnellan, when it was valued at £16. Dr. Hynes had purchased the house from the Butler estate. In the early 20th century it was given to the Sisters of Mercy and is now a school.