Diploma thesis focuses on solving of the technological preparation of building modernization of gallery residential building in Prague 1 at Petrska street. The main goal of the thesis is a demolition of the existing building and construction of a new ceiling above the third floor. The paper includes the construction and technological report, technical report for concruction site equipment, technological regulations of demolition works and the ceiling structure above the third floor – there are two design variants of the ceiling structure icluded. The variants contend a comparation of two technologies version of ceiling structure above the third floor. Thesis also includes the inspection and test plans, design of machine arrangement, transport relations, safety and health protect plan, environmental plan, work and time schedule and financial calculation of building modernization