Jamie Neil Carney, 23, faced Wollongong Local Court on Wednesday where he pleaded guilty to charges of aggravated enter dwelling with intent and assault occasioning actual bodily harm.

Documents tendered to the court said Cairney's co-offender, Dean Alan McGaw, contacted police on January 13 this year to report the theft of three motorbikes from a garage at his Beveridge Street home.

Police spoke to McGaw's wife, who told them the incident had been captured on a neighbour's CCTV cameras.

Meanwhile, McGaw told the officers friends had contacted him via social media and provided him with the name of one suspect.

Officers spent the following day canvassing the area but were unable to locate the stolen bikes.

They returned to McGaw's property to speak with him, at which time he told them he'd since learned the names of two other suspects.

Police warned McGaw against carrying out his own justice and urged him to pass any information onto them.

However, the court heard McGaw, accompanied by Cairney, twice went to the alleged culprit's house - once on the evening of January 13 and again the following night - after police had warned him against any vigilante acts.

In the first instance, McGaw and Cairney arrived at the property just after 10pm. The man's father answered the door and told McGaw, "look mate, I've got nothing to hide".

He showed McGaw and Cairney through the house and into the garage before the duo left. However, when McGaw and Cairney returned with a third person the following night, they pushed their way inside the premises and demanded to see one of the sons.

The man came downstairs, prompting McGaw to accost him, telling him "I have you on camera footage. I can see your face".

Cairney then said "stop f--king around where are they" referring to the bikes.

The man said "I didn't take them, I don't know where they are, I promise, I promise."

Cairney then hit the man in the head, causing him to fall onto the couch.

The third attacker kicked the victim in the upper back and hit him in the head.

Meanwhile, the victim's brother came downstairs and was also accosted by the third man, who hit in with a steel poll pulled from his pants.

The third man said "I'll f--king stab you, you better get these bikes back. I know your brother has something to do with it."

The trio left, with McGaw warning the family "we'll be back".

The matter was reported to police and McGaw and Cairney were both charged on January 19.

McGaw pleaded guilty to a charge of aggravated enter dwelling with intent in October, while Cairney pleaded guilty to the same charge in court on Wednesday.

Both men remain on bail and will be sentenced in Wollongong District Court at a later date.