My wife wants to be included in the ownership contract of my house. What is the Islamic ruling on that, given that she works for a monthly salary and she did not contribute in buying or restoring that house?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.

As long as you are the one who owns that house, your wife has no right in it, and you are not obliged to accept her request of being included in the ownership of the house.

 If you owe her money, she has the right to claim her money, but she has no right to claim a share in your house.

Allaah Knows best.