The thesis describes different approaches to restoring older masonry buildings, based on the case of Drnča castle, which lies in Dvorska vas in Upper Carniola. The castle is an older building under monument protection programme and it required thorough and complete renovation since it was showing signs of damage. By using the condition description and suggestions for the restoration, prescribed by Building and Civil Engineering Institute, the restoration and reinforcement measures were examined in detail. The thesis describes reinforcement of stone walls by means of injecting, the execution of reinforced cement coating on the wall contacts, anchoring ceilings to the walls, reducing the burden of ceilings, filling in the chimneys, anchoring the purlins, the execution of the new reinforced concrete bonds and the restoration of the facade. The last chapter discusses the alternative possibilities for the reinforcement of masonry walls and the renovation of structural timber.