The defending champions now have 54 points and have left second placed Green Buffaloes trailing on 46 points after 22 games played.
Wednesday’s win was Zesco’s sixth straight league victory and tenth overall during their splendid twelve match unbeaten spell.
The first half finished scoreless but both sides had great chances wasted with John Chinagndu, Lazarus Kambole and Jesse Were all coming close for Zesco United midway through the first half.
The deadlock was broken in the 57th when Were put Zesco ahead after a fine pass from Kambole who had left Buildcon defender Isaac Shamujompa playing catch-up.
Were returned the favour in the 84th minute for Kambole to complete back-to-back wins over Buildcon whom they beat 3-1 away in the first leg on April 2 at the same venue.
Buildcon stay 10th on 31 points after suffering back-to-back defeats against Zesco this season that beat them 3-1 away on April 2.Meanwhile, Were has now reached a 50-goal milestone with Zesco United.