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The main objective of this paper is to develop a model procedure for a comprehensive survey and the subsequent appropriate repairs of ashlar facing walls made of sedimentary rocks. A detailed survey of its initial state was completed and the stone masonry was described from a geological, structural and historical perspective. Depending on the kind and degree of damage and weathering, the stone elements that could be restored and those that needed to be replaced were determined. To replace the blocks, it was necessary to find a matching local alternative rock or a comparable one from another site. Therefore, a geological survey was made to identify and document possible historic quarries from where the stone for construction and subsequent repairs of the castle walls was taken. During the repair, copies of historical stonemasonry tools were used as well as stone working technologies from the period -- both with an utmost respect towards authentic material.