The architectural heritage of Latvia mainly consists of manufactured materials. The major causes of damages in the structure of historical bricks are: migration of the water-soluble salts, and frost influence in wintertime - mechanic damage of structure by crystallisation and growth of salts or architectural monuments of the Middle Age observed. There is a necessity to replace these bricks with the new ones of the same size, colour and physical properties. Nowadays, brick produced in Latvia do not meet all these requirements. Therefore there is a need to develop new materials suitable for restoration works of brick masonry. The aim of the research is to develop new materials suitable for restoration works of brick masonry. The aim of research is to analyse old bricks, to get knowledge about the manufacturing process used, and to develop similar materials from local clays for replacement of damaged original bricks in the historical buildings.