The attack happened at residential premises at the Westbrook Court area of Coleraine last night (Monday 21st January).
Detective Sergeant Wallace said: “At around 7:15pm it was reported that two men forced their way into a house in the area with one man armed with a hammer.
“It is believed that one man was wearing a hi-vis style jacket.
“One male occupant in his late teens, who was inside the house at the time of the incident was assaulted and an attempt was made to tie him up with cable ties.
“It is believed that a sum of money was taken during the incident.
“The male occupant is not believed to have been seriously injured but was left badly shaken.
“Enquiries are continuing and we are appealing for information if anyone saw anything suspicious in the area at the time of the incident to contact detectives on 101, quoting reference number 1252 21/1/19.
“Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.”