Since 2005, construction costs and, subsequently, housing costs have increased much more than incomes. This thesis deals with strategies to reduce costs for both construction and housing. On the basis of two different drafts for a plot in Ardagger Markt and a detailed cost estimate, the potentials of each strategy are estimated. One draft contains a housing complex with ten units, the other draft contains a development with four units in the form of two semi-detached houses. Cost reduction strategies can particularly be influenced by planning decisions and decisions of the developer. The total construction costs per square metre of living space of the housing complex are up to 32% lower compared to those of the semi-detached houses. Besides, the mostly smaller units in the housing complex meet the increased need for smaller households. A flexible construction allows for the adaption of flat sizes and room designations, if required, with little expense and effort. When, for example, the size of a flat is reduced after the children have moved out, the costs for housing will decrease. An accessible flat can also contribute to cost reduction since - in case the need arises - it is not necessary to move to another flat or to convert the flat at high costs. Running energy costs can be reduced by a well-insulated building envelope, a sophisticated, energy-efficient heating system, a photovoltaic system and a solar thermal system for water heating and heating support. A concept against summer heat is also important in order to avoid or minimise energy costs for cooling. Since living in an owner-occupied flat is approximately 50% cheaper than living in a rented flat, forming a community of owners is highly advantagious when constructing a housing complex. If the community of owners is also the developer of the housing complex, personal contributions and the related elimination of the developer-s margin will additionaly save costs. If personal contributions are made, the total construction costs can be reduced by more than 25% due to the saving of incidental wage costs alone. In case of an interest subsidy provided for by public housing support, the financing costs - in particular those of the housing complex - are reduced. This is primarily due to the fact that more public support funds are provided for housing complexes than for semi-detached houses. The joint construction of a publicly supported housing complex held in joint ownership proves to be a very good opportunity for cost-efficient living in Ardagger Markt.