During the reconstruction old, often historical heritage, buildings are changing their working conditions. Therefore, in most cases the foundations need to be strengthened. One of the reasons is, because the actions on foundations are changing. Other reason is building state for the foundations deformation. Foundation bearing capacity can be increased by strengthening the foundation ground or changing of the foundation construction. Reliable and effective method of strengthening is to use the jacked piles. This method must be assessed in the two approaches. One is the influence on building structures and foundations during installation, the other, relationship between piles and foundation after reconstruction. In the article is given simulation of the actions on foundation during reconstruction and load distribution between the foundation and piles. It also assesses influence of the piles stiffness on load distribution between the strengthened foundation and piles.