I am Muslim living in Canada. I am interested in buying a home but I cannot afford to pay the full amount in cash. The only way available for me is to buy on monthly/weekly installments. But these installments contains interest in it. I understand that interest is Haram, so what is the option available for me in this case.

Praise be to Allah, the Lord of the World; and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
As you know dealing with usury-taking banks is not permissible in Shariah. For more details, please refer to the Fatwa:82049  and 81349.
Therefore, whoever has committed that sin should immediately turn towards Allah, making sincere repentance and giving up that malpractice. If one gets interests on his money he must get rid of it either spending that interest in the social welfare of Muslims or giving it to a needy person.

Allah knows best.