Police said Brett Roe, 43, would stash the drugs in various places around his Wyndarra Way property so his customers could collect their supply and leave payments with as little interaction as possible.

Documents tendered to Wollongong Local Court on Wednesday said other customers would use the reserve at the back of Roe's house for pick-up purposes, with the property monitored by CCTV cameras.

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The court heard police began surveilling Roe in the middle of last year under Strike Force Swany, which was set up to investigate drug supply in the Koonawarra area.

Detectives identified Roe as a key player in the distribution of methamphetamine to drug dealers and individual users, who paid anywhere between $50 for a single, 0.1g hit of ice, known as a "point", and $5,000 for a 28g "ounce".

Detectives used an undercover police mole to buy from Roe, beginning on September 3 with the purchase of a "high ball" - 3.5g of ice - for $500.

The drug was subsequently seized by detectives who found it had a purity of 74 per cent.

Meanwhile, officers were granted a warrant to bug Roe's mobile phone. They said more than 90 per cent of his calls and text messages directly related to his drug supply business.

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Roe was monitored supplying a total of of 123g of meth in 22 individual transactions between September 24 and his arrest on December 11.

Police discovered a further 27.9g of meth when they raided his home that morning, along with fireworks, 454g of cannabis leaf and $8,437 in cash, the suspected proceeds of his crimes.

Roe pleaded guilty in court on Wednesday to three counts of ongoing drug supply and one count of conducting a drug premises.

He remains on bail and will face court later this year for sentencing.