Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a maker and factory) A workshop in a dream indicates a place of work and sustenance. Working in it indicates striving to seek lawful (halal) sustenance.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A workshop indicates a man who is diligent in his work.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A workshop is interpreted as goodness and sustenance. Whoever sees himself in it will gain sustenance.