Flipping house in north east with no insulation

Hello I am under contract to purchase a bank owned single family home in Connecticut. As I was doing my final inspection I realized there is no insulation in the walls in about 60 percent of the house ( the exterior walls seem to be cement board) The only place that is insulated is the addition built in 1997. When flipping a house would you budget for adding insulation to the walls and if you did not would you end up selling at a lower price because of this. Any input would be appreciated. We will be updating the kitchen and bathroom but we are not gutting any of the exterior walls.

Thank You