Auspicious Moment or a Suba muhurtha is to be calculated for a particular geographic position within the frame of an auspicious day using the sunrise time for that particular position as the starting point. Duration of an auspicious moment is usually 3 - 4 minutes. monday, wednesday, thursday, friday and saturday are good days to start construction of Vastu house. sunday or tuesday is not good days to start construction of house.
So they should be avoided. house (Vastu) construction started in Shukla Paksha brings happiness, while Vastu Muhurat for construction of house in krishna Paksha brings loss. So it is better to start the house construction work after well consideration of the Shukla or krishna Paksha. Before shifting or starting to Live or work in any new place it is very important to perform a Vaastu Puja. To Start any work on Bhumi (Land), laying of foundation stone, starting excavation and construction, putting the main door are to be done on particular dates of specific months, to make the house good for human habitation with comforts, health and longevity, peace and prosperity.
Vaastu Purush must be remembered and worshipped when you start any new Construction or Renovation. Generally there will no Muhurat for house construction, temple, palaces, house warming (griha-pravesh) etc. during the period of Ashadh Shukla to Kartik Shukla, when gods are in sleep (Dev Shayan).