The appellant's liability arises because in this case the persons who actually did the work negligently were the servants of the appellant, the building owner. When, as is more often the case, the builder is an independent contractor, the building owner would not ordinarily be liable to third persons for his negligence, whether or not the architect was at fault. The question whether in a case of that kind a supervising architect can be directly liable in tort to persons injured by errors of the builder which he, the architect, failed to notice and prevent is one of considerable importance. It is, no doubt, within the ordinary contemplation of an architect that builder's labourers, artisans, sub-contractors and others will be in and about a building in the course of construction. Whether or not he foresees, or should foresee, that an error such as was made in this case might be made by those carrying out the work, he is not absolved from his obligation to the building owner to exercise reasonable care. For the very purpose for which he was employed was to provide, so far as reasonable care can provide, against errors by the builders, whether such errors were probable or not. But any duty of care that an architect has to persons who are strangers to the arrangement between him and the building owner arises in an altogether different way. The architect can only incur a direct liability to them for harm they suffer as the result of the general principle expressed in Donoghue v. Stevenson [1] . The question cannot any longer be answered by talk of lack of privity. It depends rather upon what has become commonly called the doctrine of proximity. Two cases were relied upon as supporting the contention that in accordance with that principle an architect may become directly liable to an injured workman. They are Voli v. Inglewood Shire Council [1] and Clay v. A. J. Crump & Sons Ltd. [1] . But it does not seem to me to follow necessarily from either that all persons who are in or about a building in the course of construction are neighbours in the legal sense of the supervising architect. In Voli's Case an architect who designed a structure was held to have a duty of care to all persons who would later use it for the purpose for which it was designed. In such a case, if the design be defective as a result of the architect's negligence, and if, because of those defects, the structure collapses and persons using it (in the way it was contemplated it would be used) come to harm, then the architect is liable to them in damages. The facts in Clay v. A. J. Crump & Sons Ltd. were complicated, but the essential fact, for present purposes, was that a wall which was in fact in a dangerous condition was left standing, the architect having negligently stated that it might safely be so left. Where a person injured was someone who it might be contemplated would be within the area of a risk created by the architect, there is, it seems to me, no ground for excluding the architect from liability. Voli's Case and Clay's Case are decisive of that. But the situation is different in fact, and it may it seems to me have different consequences in law, when the risk is created by the negligence of a builder in departing from plans and specifications. Whether an architect is then liable to an injured person because he did not detect and correct the builder's error, as in the performance of his contractual duty to the building owner he should have done, is a question that I prefer to leave aside in this case. The answer to it would, it seems to me, be the same whether the builder be independent contractor or servant of the building owner.