Another burglary saw him use planter boxes to reach a landing between two rooms, from which he was able to gain entry. He then took $15,000 in cash, luxury watches and passports, the Sydney Morning Herald reported.
In one of Williams' more memorable burglaries, court documents show he entered a home after getting on the roof of a garage. After finding a 60 kg safe inside, Williams threw it onto the garage roof, then tossed it from here onto the lawn. The safe had $50,000 inside.
The Sydney Morning Herald said Williams was arrested after a June 3 burglary.
A police brief stated Williams said: "I've been waiting for this" after he was arrested.
He pleaded guilty to 20 charges, including several of theft and trespassing with intent to steal. He is due to appear in court again on March 24.