Kiambu Township Secondary was started in December 1998 by the Church and the Community. It opened its doors to the first 88 students in January 1999 with Mrs. S. N. Mungai as the head teacher. He was later joined by Mr. E.Gatebe as a B.O.G Science teacher.
It was registered as a public school in the year 2000, as a two streamed school. Mr.Godffrey Muiruri was posted by the T.S.C as the principal. He took over from Mr.E.Gatebe on 7th June 2000.
The school was commissioned on 2nd Novemer 2000 by the Rtd.Rt. Rev.Peter Njenga Kariuki. The School occupies a 2 acre plot donated by Kiambu Primary School. The primary school also donated five classrooms, whereby one room was being used as a laboratory.