'Oru Naal Varum' tells the story of Kulappully Sukumaran (Mohanlal) who is staying alone in a flat with his daughter. He has come to the city so that he could provide his daughter with a good education.
Sukumaran has been staying away from his wife Meera (Sameera Reddy) for a while now. Meera happens to be an IT professional.
Sick and tired of living in a rented flat, Sukumaran decides to build a house of his own. But he soon realizes that things aren't as easy as they seem to be.
The person who remains like a stumbling block in Sukumaran's dreams is the Town Planning Officer (Sreenivasan).