The building was built and open in the early 1980s by then party leader President J.R. Jayawardene.
The general secretary of the United National Party is the official trustee of the building, The building is use for all party activities of the United National Party including the Working Committee, Trade Union, Students' wing and women's meetings.
Sirikotha was damaged from clashes between party supporters in 2012 during a leadership election and was redesigned by renowned architect Mihindu Keertirante.
[1] In 2014 Opposition Common Presidential Candidate Maithripala Sirisena received a rousing welcome when he arrived at the UNP headquarters.
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