KCB have won the Stanbic 7s national title for the first time since 2014.
The Kenya Cup champions were confirmed the series champions after reaching cup quarters at Driftwood 7s in Mombasa.
Close rivals Mwamba and Nakuru failed to reach cup quarters.
By reaching cup quarters KCB are assured of at least 10 points meaning they already have 104. Mwamba will earn a maximum of 8 points if they win Challenge trophy to put them at 102.
Mwamba lost 17-19 to Kabras as well as drawing 12-12 with Homeboyz to drop to challenge trophy quarters.
Heading to Mombasa, KCB needed to finish just fifth and that was achieved after reaching quarters.
On their way to the title, KCB won Kakamega 7s, Dala 7s and Christie 7s as Mwamba took honors at Kabeberi and Prinsloo 7s legs.
The overall Division One winners, runners up and second runners-up will get prize money worth: Kshs. 500,000, 250,000 and 150,000 respectively.