A contractor working at Sydney Opera House who was fired for getting drunk and allegedly sexually propositioning a colleague after hours has won her job back.

The Fair Work Commission found the female project manager was unfairly sacked and ruled that getting drunk and vomiting at after-work drinks did not justify her dismissal.

A sub-contractor for the Sydney Opera House has got her job back after losing it over a drunken episode. Credit:Peter Braig

Commissioner Ian Cambridge said "if one act of inoffensive drunkenness at an after-work function provided valid reason for dismissal, I suspect that the majority of Australian workers may have potentially lost their jobs".

The woman who worked on site on behalf of electrical contractor Ryan Wilks was sacked for serious misconduct on August 2 last year after she attended farewell drinks for a Sydney Opera House colleague in July. The event started at the Opera Bar before moving to the Portside Bar.