Abstract
The grey area exists in all countries of the world. It is visible in various areas of activity, which means that it is widespread. It is a sign of the weak state institutional structures and overregulation of the economy. Traces of it are also visible on the real estate market. This paper argues that the size of the shadow economy in the real estate market is significantly undervalued. For this purpose, areas of its occurrence which had not been included in previous estimates were indicated, prepared by the Central Statistical Office and the Gdansk Institute for Market Economics. Two ways of tracking the grey zone were used: press reports and case studies.