Sydney man Adeel Khan, who was found guilty of killing three people by setting fire to his shop, has been sentenced to a minimum of 30 years in jail.

The former Rozelle convenience store owner was found guilty by a Supreme Court jury of the September 2014 murder of 27-year-old Chris Noble, and the manslaughter of 11-month old Jude and his 31-year-old mother Bianka O'Brien.

Khan, 46, was also found guilty of causing grievous bodily harm to Mr Noble's flatmate, Todd Fisher, wounding a second flatmate, Corey Cameron, and destroying a building for financial gain.

His maximum sentence is 40 years and with time served he will not be eligible for parole until at least 2044.

Mr Noble and his flatmates lived above the store and Ms O'Brien and her family lived in a neighbouring unit.

During her sentencing remarks before a packed court room on Friday, Justice Elizabeth Fullerton said Khan had repeatedly said sorry while he was being extricated from the debris following the blaze.

She said Khan gave evidence that although his business had not been profitable, he had withdrawn approximately $50,000 from the business to meet his debts.

Chris Noble was killed in the fire at Rozelle set by Adeel Khan.

"I am satisfied beyond reasonable doubt that the offender's motivation in planning for and deliberately setting and igniting the fire was personal, financial gain," Justice Fullerton said.

"The extent of harm is reflected in the loss of three lives in a major fire ... and the injuries caused to two others," she said.

Mr Noble's mother, Liz Noble, said when Khan gets out of jail she would not be alive anymore.

"I don't need to think about him spending time with his family, when we can't spend time with our family," Ms Noble said.

"We're very pleased with the length [of sentence] the judge gave, she's obviously put a lot of thought into it.

"The fact that he's never exhibited any remorse or care and I don't understand how someone who is supposedly a family man, can do what he did to so many other families and not care."

She said she was pleased that the trial was over.

"I think Chris would be pleased with the result ... and now we can concentrate on Chris and living the best way that we can to honour Chris."

I reject the offender's denials: judge

Justice Fullerton said Khan's account of the incident was "a fabrication ... carefully constructed by him to avoid criminal liability for the deaths, injuries and destruction of property for which he knew he was solely responsible".

"I reject the offender's denials that he said to the ambulance officer that he didn't mean it," she said.

Bianka O'Brien and her son Jude were inside their apartment during the blast and fire. ( Supplied: Facebook )

"I am satisfied that those words and the accompanied and repeated words of apology were a spontaneous utterance ... that he was, at least at that time, acknowledging sole responsibility for the explosion and fire."

She said given the amount of petrol that he had poured around the store "that he did not anticipate ... an immediate explosion ... simply beggars belief".

That he did not consider a massive catastrophic explosion shows ...."rank ignorance...rank arrogance....or a blind determination to pursue his selfish objectives at any cost or a combination of all three".

She said the amount of planning involved in the act and the fact that Khan ensured his own safe retreat "constitutes a course of the gravest criminal conduct".

Justice Fullerton also noted Khan's lack of remorse and contrition as contributing to the length of the sentence.

Khan continually denied responsibility for deaths

Despite the guilty verdicts, Khan had continually denied responsibility for the deaths, and during the trial he claimed armed men tied him up and blindfolded him on the night of the blaze.

Khan admitted to buying containers of petrol, but denied lighting fuel-soaked lengths of cloth that linked the containers throughout the shop, which led to a huge explosion and fire.

The prosecution argued Khan lit the blaze to get out of his failing business and make an insurance claim.

During sentencing submissions, Mr Noble's mother, Liz Noble, revealed she now had a tattoo of her son's final words to her while trapped in his burning bedroom.

Ms Noble said the different verdicts had been distressing because there was no difference between the lives lost.

Prosecutor Mark Tedeschi said while the murder offence did not fall in the worst-case category, the manslaughter offences did.

In his closing address to the jury, Mr Tedeschi said Khan's explanation for his purchase of 38 litres of petrol two nights before the fire does not make sense.

Khan told the court during his evidence that he wanted to have fuel in his car, so he could test the range of his vehicle after the low fuel warning light came on.