In the absence of rituals and ceremonies, a house merely remains a brick-and-mortar structure and not a home.
Rituals and ceremonies are the essence of ancient wisdom, with a following that's been around for centuries. Since Vaastu also forms the subject matter of ancient wisdom, it subscribes to a few ceremonies.
'BhoomiPujan' - which is done prior to the commencement of construction work - tops the list. The second is the 'Neev Ceremony' done at the time of laying the foundation. The third comes at a time when the front door is being fixed. This is an important aspect of construction and one should find an auspicious date/time to figure out when the door should be fixed.Another ceremony of note is the house warming ceremony that serves two purposes - one is to seek the blessings of the and the other is to share your happiness with well wishers. This is the time when your house needs protection from the evil eye, especially of the near and dear ones who might be jealous of your growth and success. Such feelings have no logical or scientific explanations. Try to nip it in the bud by sprinkling along the four directions. In the absence of such rituals, a house remains a mere brick-and-mortar structure and not a home.
Moreover, one should never move into an incomplete house. It is said that such houses may be under the influence of negative vibrations, often referred to as evil spirits. If a family decides to move into such a house, they would find it difficult to prosper; they would also find that there are quarrels between family members. There's also a fear that however much you earn, in such a house it would only result in wastage. Thus, it's more advisable to move into a rented accommodation. Only on completion should you move into a property.