After 46 years of continuous use, Mies van der Rohe's Neue Nationalgalerie in Berlin closed its doors to start works on its refurbishment. Being a masterpiece of the second half of the 20th century, conventional standards in terms of dealing with high-level heritage must be adhered to. The quality of this refurbishment can be found in the project’s holistic approach. Not only by taking into account the visual integrity but also by paying attention to its physical substance, time-bound and classical elements, the added value of the project is created