Harappans were excellent city planners. The quality of municipal town planning suggests the knowledge of urban planning and efficient municipal governments which placed a high priority on hygiene.
Harappan City was divided into the upper town called the Citadel (in the citadel rich people lived) and the lower town. Lower Town was the residential area where the common people lived. (However, some cities did not follow this model)
City streets were based on a grid system and oriented east to west. Roads and streets intersected at right angles.
Generally, houses were either one or two storeys high, with rooms built around a courtyard. Most houses had separate bathing areas seems to be Great Bath, and some had wells to supply water. There are side rooms for changing clothes
Public wells in every street, Main streets varying from 9 feet to as wide as 30-34 feet.
There were covered drains laid along the road in a straight line. Houses were built on either side of the roads and streets. Each street had a well-organized drain system. As the drains were covered, inspection holes were provided at intervals to clean them.
Remarkable use of burnt bricks. The ratio of which is remarkably similar across IVC cities.
No stone-built houses in the Indus cities and the staircases of big buildings were solid; the roofs were flat and were made of wood.
Houses had the same plan – a square courtyard around which were several rooms. Entrance to the houses were from the narrow lanes which cut the street at right angles. No windows faced the street.