Opinion by
Mr. Justice Fell,The single question presented by this appeal is whether the eighth section of the Act of June 8,1893, P. L. 360, which regulates the construction, maintenance and inspection of buildings in Philadelphia, imposed on the defendant the duty to underpin and protect the wall of a building on an adjoining lot. The first part of the section requires the owner of a building to sustain his wall erected on or near a boundary *541line, or to pay the cost of making the building secure when excavations are made on the adjoining land to a depth not exceeding ten feet. The latter part of the section requires an owner of premises on which an excavation is made to a greater depth than ten feet to underpin and protect the wall of an adjoining structure. This part of the section is as follows : “ Should any owner or owners desire to excavate to a depth of more than ten feet, he or they shall protect and un. derpin the wall of an adjoining structure at his or their own expense ; provided, however, that this section shall not apply to buildings now erected or to dwelling houses.”
It is conceded that the defendant is not liable for the destruction of the building occupied by the plaintiff as a tenant unless made so by the act of 1893, because prior to that time the owner of premises was required only to support the land of an adjoining owner in its natural state, and not to support buildings erected thereon. The building destroyed was erected before the passage of the act, and the proviso makes the section inapplicable in this case. It is, however, contended by the plaintiff that the proviso as written is void, because repugnant to the section whose operation it is intended to qualify and limit, and that it should either be struck out altogether or construed as applying only to the first part of the section, or as excepting from the operation of the act buildings now being erected instead of “ buildings now erected.”
This contention cannot be sustained. The proviso only limits the application of the section in accordance with the legislative intention to establish regulations for the future for the construction of certain kinds of buildings. The act is a comprehensive one, creating a bureau of building inspection, defining its powers and establishing many new regulations to be observed in the construction of buildings and providing means for their enforcement. Generally these regulations are meant to apply to buildings of unusual size, erected for business purposes. Many of the regulations would be useless and unnecessarily burdensome if applied to small buildings or to dwelling houses. The seventh section of the act, which provides for the laying of foundations, has a proviso authorizing the building inspectors to exempt buildings from its requirements “ when it appears that buildings are located on a street that is *542not likely to be used for business purposes.” The tenth and eleventh sections, which relate to the construction of base courses and foundation walls, are expressly made not to apply to dwelling houses. The eighth section imposes on owners thereafter erecting buildings other than dwelling houses the duty of supporting their own walls to the depth of ten feet, and extends the common-law right of lateral support of land in its natural state to land on -which buildings have been erected, where an excavation is made to a greater depth than ten feet, by requiring the second builder to support both land and building. Read without its proviso, this section would impose thé duty of lateral support in all cases. This would make the section retroactive, and would work injustice by requiring an owner whose building was constructed in accordance with the then existing building laws to underpin and support it, and by imposing on a builder the duty of supporting a building difficult to support because of its inadequate foundations. It may have been thought unnecessary to make the act apply to dwelling houses, since foundations ten feet below the surface are not usually necessary for their support, and the duty of supporting them hr addition to the land is slight. It was deemed wise to change the law in regard to lateral support because of the changed conditions brought about by the construction of buildings requiring exceptionally deep foundations, and the line was arbitrarily fixed for the future at ten feet below the surface.
In deciding the - question raised, we need look only to the legislative intention. This we find to be not that the act should apply to all buildings, in whiph case the proviso would be repugnant, but that it should apply in the future to certain classes of buildings. With this intent the proviso is entirely consistent, and both the section and the proviso can stand.
Since the language of the act is intelligible and clear, there is no room for construction.
The judgment is affirmed.