This thesis will look at the produc琀椀on of sustainable mobile homes using nearly Zero Energy Building (nZEB) principles. The purpose of the thesis is to inves琀椀gate the jus琀椀昀椀ca琀椀on for inves琀椀ng in this type of produc琀椀on in terms of investment costs and to design sustainable mobile homes. A nZEB priniciple is a structure with high energy e昀케ciency. It consumes very li琀琀le energy, which is primarily derived from renewable sources, including energy generated on the building or nearby. The primary factors in determining the jus琀椀昀椀ca琀椀on for inves琀椀ng in the produc琀椀on of sustainable mobile homes are economic pro昀椀tability, energy e昀케ciency, environmental sustainability, and user comfort and quality of life. Through a series of ac琀椀vi琀椀es over the last few years, the European Union has set the goal of reducing greenhouse gas emissions by up to 90% by 2040, as part of Europe's long-term vision of becoming climate neutral. The obliga琀椀on to build according to the condi琀椀ons for almost zero energy buildings is prescribed by Direc琀椀ve 2010/31/EU on the energy e昀케ciency of buildings, and the provisions of the Direc琀椀ve have been transferred to the Republic of Croa琀椀a's legisla琀椀ve framework by the Construc琀椀on Law. As a result, the importance of developing sustainable solu琀椀ons in house design to reduce the nega琀椀ve impact on the environment will be emphasised. Addi琀椀onally, key concepts and principles of nZEB will be de昀椀ned. The research methodology involves analysing the mobile home model and comparing its advantages and disadvantages in terms of economic pro昀椀tability, investment costs, energy e昀케ciency, and environmental sustainability using an investment study. Finally, the obtained results will be described and summarised, and the pro昀椀tability of such an investment will be demonstrated.