Educated at Holy Cross College, Gampaha; Bandaranayake College and Ananda College; he graduated from the Faculty of Engineering of the University of Moratuwa and became a Civil Engineer. And also He ranked island 9th in Advance Level exam in year 1982 in math stream and entered to University of Moratuwa Sri Lanka. He is a prestigious alumni from University of Moratuwa.
Mannapperuma joined the United National Party and entered local government politics. He served as the first mayor of Gampaha from 2002 to 2009, before being elected to the Western Provincial Council in 2009. He entered parliament in 2013 from the Gampaha District following the unexpected demise of Jayalath Jayawardena. Mannapperuma was returned to parliament in 2015 from the Gampaha District.[1][2] In 2021, he failed to gained the required preferential votes to be elected to parliament, however was appointed to parliament to succeed Ranjan Ramanayake after the latter lost his parliamentary seat following his imprisonment with his conviction of contempt of court.
He withdrew his candidacy after submitting nominations for 2024 parliamentary election, criticizing party leader Sajith Premadasa for dismissing him as SJB chief organiser for Gampaha electorate.[3]
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