Reconstruction of brownfield sites is part of the EU cohesion policy, a priority area for EU development funding, and a permanent theme for the Committee of the Regions. Redevelopment of brownfield sites is also a solution to ensure sustainable urban sprawl and land management. One of the main advantages of brownfield investments over greenfield investments is, that on the one hand it is not necessary to build the utility infrastructure and road network because it is already built, and on the other hand the development is land-saving, as it is not necessary to declare new undeveloped areas as construction areas. Another advantage can be mentioned: the investment is implemented and the improvement of the environmental conditions, contributing to the appreciation and sustainable development of the settlement. At the same time, the development of brownfields causes challenges during urban planning. On the one hand, an attractive regulatory environment has to be created in the master plans for investors, usually with a high building ratio, but on the other hand, sustainable transport for the area still has to be ensured for the long term. According to our experiences, in order to satisfy the cost-effective investment intention of investors, there is a need to ensure the maximum build-up density of the area, which generates a much higher transport demand than before, which the existing transport infrastructure and services can no longer fulfil, and therefore capacity expansion will be required. However, to ensure sustainable settlement development, the additional traffic demand generated by the brownfield redevelopment must be served following the methodology and criteria of sustainable transport development. Using the experience of a Hungarian case study, the authors present a new brownfield redevelopment model, which can help decision-makers and planners to make the right settlement planning decisions, apply optimal transport planning criteria and methods, and select the adequate, sustainable transport development tools for brownfield investments, during preparation and implementation.