A Sydney creative who went home with a woman after a night at Newtown's Bank Hotel has been convicted of climbing in her roommate's window and sexually assaulting her.

Matthew Branagan, the co-founder of popular Redfern studio Work-Shop, and a friend did “some cocaine from a small plastic bag” before arriving at the hotel together on the night of October 7, 2017, according to court documents seen by the Herald.

Matthew Branagan, convicted in June of sexual assault. Credit:Instagram

Branagan met a woman at the hotel with her housemates and the duo decided to go to the granny flat that the woman lived in behind her share house shortly after 3am.

The pair were sleeping together, court documents say.