Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The builder in a dream is a man who unites people in goodness. Building indicates long life and familiarity.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Building indicates marriage for the unmarried. Whoever sees himself build a house will get married.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Building is interpreted as goodness and blessing. Whoever sees himself build will receive goodness.