The simple builder is still full of uses. It will raise your foes up from the ground, making them easy targets, or it can cover some ground if wind is added. Builder and its Mega variant hit the exact place you hit at with every following bounce, meaning a perfect hit deals full damage. However during the bounce, which is rather high as well, the builder can get influenced by wind, x2, pink barriers, portals and even hit targets. Portals rarely change anything since the weapon goes right back through the portal again, however if the high point of the bounce stays within the portal, it is possible that the Builder land beneath the other portal. It is also possible that you don't do full damage. This is because the damage radius is larger than the terrain increase radius, meaning that you will do damage at first but the Builder then heightens its point of impact, leaving the target behind.
Like its Digger counterpart, construction fires 12 builders in a spray pattern that bounces around randomly upon hitting the ground. The amount of terrain created individual projectiles are not very noticeable on their own, but landing several projectiles in the same place can create a hill fairly quickly.