The "Lower Town" was divided into a number of blocks by a grid of straight streets running north-south and east-west, and each block was further divided by small lanes. Some houses had rooms with wells, bathing rooms (paved with baked bricks) and even toilets. Waste water was drained out of the houses through drain chutes built into the side walls that fed into a system of drains built alongside the lanes and streets.

Mohenjo daro
At Mohenjo daro, the number of rooms in the houses in the "Lower Town" varied from two to more than twenty; and one out of three houses had rooms containing wells.