High end refurbishment project in central London involves variety of different engineering aspects: Justification of existing timber trusses and cast iron columns as well as cutting edge design for the glass stairs connecting three levels of the apartment as well as massive size double glazed units to open magnificent view to the river Thames. Special timber strengthening techniques have been used as well as advanced solid modelling analysis was carried out to check cast iron columns. In addition, complicated steel frame has been designed to form a modernist style rear extension to existing traditional masonry house.