A bathtub installation aide apparatus. The apparatus exhibits a box-shape, which is configured to act as a placeholder at a drain point. The apparatus is equipped with a drain trough, and facilitates in the creation of empty space around a tub drain during ultimate installation of a bathtub. The apparatus removes the need to use cardboard and/or dirt/sand in the molding and construction of the bathtub and foundation. A leak detector unit is present to alert when the presence of a leak is detected after a set period of time has elapsed. A sensor is configured to relay the presence of water to the leak detector unit. A bottom of the apparatus is equipped with tiers or steps to funnel water towards the drain, even in the event of a leak.