The deflection of the building in relation to the vertical is caused by its uneven lowering. The deflection hinders the use of the building and causes occurrence of the additional inner forces which the construction of the building is not designed to take. Therefore, the deflections of the buildings should be removed. Three methods of removing building deflection have been used in Poland. The first method is removing the soil from under the part of the building which is positioned too high. The second method is elevating parts of the building that are too low. The third method is simultaneous removing the soil and elevating the building. In this work all three methods are presented and analysed showing their advantages and disadvantages. Removing the soil from under the part of the building which is positioned too high can be achieved by drilling holes under the building or cutting parts of the soil under the building. After removing the soil, the building returns to the vertical. The advantage of this method is no interference in the construction of the building. The disadvantages are the lack of precise control over the process and the necessity of occupancy for the construction site the considerable area around the building. The second method to remove the deflection of building is elevating using the hydraulic jacks. These jacks are usually built-up in the openings made in the walls of the lowest level. Removing deflection through elevating is performed through inflicting shifting to the jacks. It consists of three phases: tearing the building, steady elevating and not steady elevating. In practice two types of jacks are used: hydraulic piston jacks and hydraulic diaphragm jacks. These jacks can be manually or computer controlled. The advantage of this method is full control of the levelling process. The disadvantage is the interference in the construction of the building (tearing the building). The last method is simultaneous elevating parts of the building located too low and lowering parts of the building positioned too high. Removing building deflection through non uniform elevating with the help of hydraulic piston jacks is the method being used the most often.
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