Source: The Great Interpretation of Dreams (Ibn Sirin)
The foundation of a building in a dream is the grandfather, the father, or the religion. Its strength is the strength of the religion and the grandfather. Its weakness is their weakness.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
The foundation indicates knowledge and piety. Whoever sees himself laying a foundation will be blessed with a scholarly child.
Source: Signs in the Science of Expressions (Ibn Shaheen)
The foundation is interpreted as the father. Whoever sees his foundation is strong, his father was righteous.