Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a maker and work) A factory in a dream indicates a place of work and striving for livelihood. Working in it indicates toil and fatigue in seeking a living.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A factory indicates a man who manages many affairs. Entering it indicates starting a project.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A factory is interpreted as worry and fatigue. Whoever sees himself working in it will be afflicted with fatigue.