11Where, with the privity and consent of the husband, work is done or services performed or material is furnished to be used upon or in respect of the land of a married woman or land in which she has an interest or an inchoate right of dower, the husband shall, for the purposes of this Act, be conclusively presumed to be acting as her agent as well as for himself, unless the person doing the work or performing the services or furnishing the materials has notice to the contrary.