IS DEMOLITION NECESSARY IN VASTU?

When we talk about Vastu, the first thing that came in mind that we have to demolished our building to correct it. But in modern era where most people lives in multistory and demolition is not possible. Here comes the concept of colour and metal theory. so without any demolition we can remove any negative activity and utility of thing. And balance the house. By adding or removing some colours we can balance the zone.