Vastu means temple. Dosh means defects; where we stay. There are defects in homes, temples, villages, offices, pilgrimage, Factories, Farms. From huts to palaces, there are one or the other defects/dosh.
In houses where there is dosh such as bad elements accidents of suwasini, betrayal of our ancesters widows helplessness etc., are vastu dosh.
Under such circumstances there will be no satisfaction, peace of mind good health and financial stability. Therefore to overcome this Navanath Vastu bandhan is quite necessary.