The important features of the Harappan town planning: 

(i) It is marked by considerable uniformity, though some regional variations have also been noticed.

(ii) The uniformity is the lay-out of the towns, streets, structures, brick size, drains etc.

(iii) Harappan, Mohenjodaro, Kalibangan and almost all other major sites are divided into two parts — a citadel on higher mound on the western side and a lower town on the eastern side of the settlement. The citadel on higher mound on the western side and a lower town on the eastern side of the settlement. The citadel contains large structures which might have functioned as administrative or ritual centres. The residential buildings are built in the lower town.

(iv) The streets intersect each other at right angles in a criss - cross pattern. It divides the city in many residential blocks. The main street is connected by narrow lanes. The doors of the houses opened in these lanes and not the main streets. 

(v) The houses were largely built of burnt bricks. The houses of common people differed in size. The bigger houses had many rooms surrounding a square courtyard. These houses were provided with private wells, kitchens and bathing platforms. There were also one - room buildings or barracks. Perhaps these houses were built for the poor section of the society.

(vi) The drainage system of the Harappans was well developed. Every house had drains, which opened into the street drains. These drains were covered with manholes bricks or stone slabs. These were constructed at regular intervals by the side of the streets for cleaning. This shows that the people of Harappan civilization were well acquainted with the science of sanitation.