The task of this graduation thesis is to make a construction calculation with a proposal for renovating the roof of a family building. This family house is located in Tvrđavica witch totalnet area of 644,67 m2. The roof is complex, consisting of two pairs of roof surfaces with a slope of 16 and 26 with a total area485,45 m2. The static roofing system consists of rafters, purlings, collar beam, columns and principal rafter. All elements are made of solid wood of strength C24, with the following dimensions: rafter 12/18 cm, purling 19/19 cm, collar beam 8/16 cm, column 19/19 cm and principal rafter 12/18 cm. The structure is subject to constant and variable loads, including snow loads and wind loads. Two critical rafters and two critical purlings were selected, for which the calculation was carried out and the conditions for evidence of bearing capacity and stability were checked. The rafters meet the conditions, i.e. they are oversized due to their large cross-section. Purlings do not meet the requirements for the limit state of bearing capacity and the limit state of serviceability. The reason for this is that the static system is not suitable and the supports do not prevent horizontal movements. Wooden elements were added to tie everything together to act as a whole, and the column joints were reinforced with steel shoes to absorb the horizontal force. With these measures, all the evidence for the limit state of load-bearing capacity and the limit state of usability are satisfied, and the roof is on the side of safety. Valid HRN EN standards and regulations were used for the purposes of calculation and construction. The attachments were created in the AutoCAD 2017 computer program, and all models and load combinations were created in the Autodesk Robot Structural Analysis Professional 2021 program.