Opinion by
Mr. Justice Wolverton.
1. The mill company’s claim, so far as it is necessary to quote it here, is in the following language: “Know all men by these presents that the Gladstone Sawmill Company have, by virtue of a contract heretofore made with Kasper Tscharnig of Oregon City, Oregon, a lien for materials furnished in the alteration and repair of a certain two-story building constructed and being upon the following described land, to wit: The north half of lot eight (8) in block twenty-seven (27), Oregon City, Oregon. That H. W. Ross is the owner of said building, and that Kasper Tscharnig is in possession of the same under a contract and bond for the purchase of the same. ” Then follows the statement of the account or demand. The sash and door company’s claim is in almost the same language. The said claims meet the objection to the claim *51of lien filed in Rankin v. Malarkey, 23 Or. 593, (32 Pac. 620, 34 Pac. 816,) and that case is, therefore, not in point as authority against the liens herein claimed.
2. There are other objections, however, to the sufficiency of the complaint raised by the defendant Ross, which we will now examine. The statute provides primarily for a lien upon the building. If, however, the land upon which it is constructed belongs to the person who caused the building to be erected, improved, altered, or repaired, then the land upon which the building is constructed, together with a convenient space about the same, or so much as may be required for the convenient use and occupation thereof, is also subject to the lien, to the extent of his interest therein. But if the land does not belong to the person causing the building to be erected, or alterations made, then, if built “with the knowledge of the owner of the land or person claiming an interest therein, the building shall be deemed to have been constructed or the alteration made at the instance of such owner or person claiming an interest therein, ” unless by proper notice he disavow responsibility therefor: West Coast Lumber Company v. Newkirk, 80 Cal. 278 (22 Pac. 231). So that it is apparent the statute contemplates a lien on the building primarily. The owner thereof, by causing the building to be erected or alterations made thereon, may subject it. to a mechanics’ lien. For the purpose of binding him, the labor may be done or materials furnished either at his instance or that of his agent, and the statute expressly provides that every contractor, subcontractor, architect, builder, or other person having charge of the *52construction, alteration, or repair, in whole or in part, shall be held to be such agent. Secondarily, if the owner of the land is some person other than the owner of the building, then his consent is presumed, in the absence of notice to the contrary, if he have knowledge of the progress of the improvement. The building must be erected or repairs or alterations made at the instance of the owner or his agent, which is the same thing, under the maxim quifaeitper alium,faeitper se. If, therefore, the building be erected or repairs or alterations made at the instance of some other person than the owner, the lien cannot attach. A stranger or intermeddler could not thus encumber the property of another. See sections 3669, 3670, and 3672 of Hill’s Code of Oregon. Now the claims filed state that the defendant Ross is the owner of the building, and that the materials were furnished under contract with and at the instance of the defendant Kasper Tscharnig. The allegations of the complaint are to the same effect. So we have here both the claim of lien and complaint, which concurrently show that the materials were furnished at the instance of a person other than the owner of the building, to wit, Kasper Tscharnig. There exists no statement or allegation anywhere, either in the claims of. lien or the complaint, that H. W. Ross, the owner of the building, caused the materials to be furnished, or that the same or any part thereof were furnished at his instance or request. True, it is shown that Kasper Tscharnig was in possession of the premises under contract with Ross for the purchase of the same, but this fact does not change the relations of the parties under the allegations of the complaint. What the terms of this contract are we are not informed. It would seem, therefore, that the complaint is insufficient to support the liens in this respect. If, however, it be claimed that the consent of Ross will be presumed under section 3672, and that the lien therefore *53attaches to the building as well as to the land, the allegations of the complaint are insufficient to support the contention, as they do not show that the improvements or alterations were made with the knowledge of Ross: Allen v. Rowe, 19 Or. 188 (23 Pac. 901). The complaint as to both causes of suit is clearly insufficient, and the demurrer should have been sustained. The decree of the court below is therefore reversed, and the cause remanded for such other proceedings as may be deemed advisable not inconsistent with this opinion. Reversed.