770 ILCS 60/3
If any such labor, services, material, fixtures, apparatus or machinery, forms or form work are performed upon lands belonging to any married person, with the married person's knowledge and not against the married person's protest in writing, as provided in Section 1 of this Act, in pursuance of a contract with the spouse of such married person, the person furnishing such labor, services, material, fixtures, apparatus or machinery, forms or form work shall have a lien upon such property, the same as if such contract had been made with the married person, and in case the title to such lands upon which improvements are made is held by married persons jointly, the lien given by this act shall attach to such lands and improvements, if the improvements be made in pursuance of a contract with both of them, or in pursuance of a contract with either of them, and in such cases no claim of homestead right set up by a husband or wife shall defeat the lien given by this Act. For purposes of this Section, property shall be deemed to be held jointly if title is held by the parties either in tenancy by the entirety or jointly, with right of survivorship and not as tenants in common.
770 ILCS 60/3