According to Launceston Criminal Investigation Branch detectives, the woman was attacked by a man in her West Launceston home about 1.40am on Wednesday.

The woman is recovering with friends and has been given support by emergency services.

Detective Inspector John King provided a description of the man on Thursday.

"The man is described as of slim build and softly spoken with possibly an olive complexion," he said.

"He was in an agitated state.

"He was wearing dark-coloured clothing with a hooded top.

"Anyone who saw a man fitting this description in the area on Wednesday or Thursday, or recognises the description, is asked to contact Launceston CIB on 6777 3911 or Crime Stoppers 1800 333 000."

Police have reminded residents to be mindful of home security at all times.