This article aims to understand the principles and main stages of the planning of Dunaújváros (Féjer county), former Sztálinváros, the first ‘Socialist city’ in Hungary whose construction was decided at the end of 1949 to accommodate the largest Iron works in the country. Tibor Weiner, the chief architect, left his mark on the new town built away from the old village (Dunapentele). Socialist realism trend imposed by Stalinist power was dominant in the first half of the 1950’s, and we will examine how this style influenced – with some contradictions – the roads’ layout and the architecture of the first districts and buildings. “Destalinization” and the Krushchevian turn started in 1954 led the Socialist camp in a new direction. From then on, the emphasis will be on mass housing and new construction methods, an ideological and technical turning point that will determine the current physiognomy of the city (Thesis work written for the Budapest University of Technology and Economics, December 2020).