Two women were attacked in the incident in Ballynahinch.
The burglary occurred at 9.25pm on Friday night, which saw one woman tied up and another tied up and beaten with a baseball bat.
A child was present in the house when the burglary occurred.
Three men entered the residence on Dunmore Road sometime between 6pm and when it was reported to police.
Each woman was tied down with cable ties and locked in rooms of the house as the thieves fled.
The women were brought to hospital along with the child at the scene.
Detective Sergeant James Johnston of PSNI asked: "Were you in the Dunmore Road area around this time last night, between 6pm and 9pm? Did you see any strange vehicles in the area? Did you seen three men in the area acting suspiciously?"
"If you have information you believe may assist our investigation contact detectives in Ardmore on the non-emergency number 101, quoting reference number 1307 of 02/11/18."