An ice-addicted Melbourne man who raped a woman and a teenage girl in separate attacks in their homes has been sentenced to 18 years' jail for his crimes, which have left the women living in constant fear.

Davut Bulduk, 31, threatened to kill the woman and the high school student during terrifying ordeals in their bedrooms in Melbourne's north in December 2015 and February 2016 respectively.

The court heard the father of two entered of the homes with the intent to sexually assault his victims.

He knew the woman — a mother — would be home alone, and he had surveyed the teenager's home for several hours before entering.

In sentencing, Victorian County Court Judge Paul Lacava said Bulduk's daily ice use after the failure of his marriage only partly explained his violent attacks.

"There was nothing spontaneous or irrational about this offending. You planned it," he said.

"They had no chance to protect themselves from you even in their own respective homes.

"This kind of offending strikes at the very heart of proper standards of behaviour by men towards women in a civilised society like Australia and will not be tolerated."

Judge Lacava said the impact on the victims was difficult to put into words, but both would suffer for the rest of their lives.

"She was a year 11 schoolgirl when you attacked her in her own bed," he told the court.

"Her hopes and ambitions for the future have vanished.

"[Hers] was a family full of love and happiness. You've managed to turn it into a family living in constant fear."

The court heard Bulduk had expressed shame and remorse for his offending.

Judge Lacava found his prospects of rehabilitation were reasonable.

Bulduk will be eligible for parole in 13 years. His address and image are subject to a non-publication order.