The aim of the article is to analyze the dynamics and the scale of commercial activities of farmers within Powiat Poznański. The research was based on the investments in buildings and other structures used for animal production. It covered the period after Polish accession to the European Union. The urbanization of Powiat Poznański is visible. The acreage falling has affected the agricultural production. After the accession, the farmer’ interest in commercial building investments fell. The closer to Poznań, lower the number of investors.