One woman woke up to find Williams in her walk-in wardrobe, after he had climbed her walls and got in through the bathroom ensuite window.
At another home he pushed a 60kg safe out of a window onto a garage roof, then onto the grass, before taking it over a fence. Williams also stole $145,000 in cash from a safe behind a false wall in a Brighton home, the court heard.
He broke into homes in Balwyn, Brighton, Kew and Toorak.
He regularly drove from NSW to commit the crimes from July 2009 until he was arrested after breaking into a Toorak home in June 2013.
His defence lawyer Charles Nikakis said Williams had a history of using the drug ice, and used the stolen money to support his family.
He said there had been no violence in the burglaries, and both times Williams was caught he ran immediately.
Mr Nikakis said Williams cooperated fully with detectives, answering more than 1000 questions in his police interview.
"He made full admissions to all questions," he said.
Judge Bill Stuart said the number of burglaries and the money involved had to be weighed against Williams' complete cooperation with police and letter of remorse.
Williams, who moved from New Zealand to Australia in 2002, will be sentenced tomorrow.
- AAP