A man was assaulted in his Shell Cove home after three armed men broke in Tuesday night.
A 26-year-old man and a 29-year-old woman were at a home on Muirfield Avenue when three men entered about 7.40pm.
Police have been told the men were armed with bats and assaulted the male occupant of the home.
The 29-year-old woman was not injured.
Paramedics treated the man at the scene before he was taken to Wollongong Hospital in a serious but stable condition.
Police said the attackers were wearing hooded jumpers, gloves and had their faces covered.
Lake Illawarra police are investigating the incident and urge anyone with information to contact Crime Stoppers on 1800 333 000.