Large housing estates in many European countries face similar problems such as ageing of buildings and outdoors space, social segregation, as well as challenges related to ecological sustainability. Due to competition from the newer residential development, large housing estates are becoming subject of degradation. New development is often characterized by a higher quality of apartments and outdoor environment, so those who can afford moving into new dwellings leave large housing estates. This process fosters not only social, but also ethnic transformations. Still in many Eastern European countries large housing estates represent a big part of housing stock and host big proportion of population. Privatization of apartments is one of the reasons, why large housing estates remain highly estimated by a variety of socio-demographic groups. In Riga about 60% of population live in large housing estates. According to data from 2017, regardless the fact that people appreciate private housing, in general, affordable remain apartments in housing estates built in the second part of the 20th century or new multi-story development. So, the question on how to prevent degradation of those territories is of high interest today.Following compact city development guidelines, infill development appears as regeneration strategy for housing estates in many European countries. One of important questions relates to the impact of infill development on the public open space.The aim of this article is to follow up and evaluate infill development projects built starting from 2000 till now in large housing estates in Riga. Analysis includes infill development in 13 large housing estates (built in 1958–1990). Research shows types of infill development presented in Riga and their impact on the outdoor environment of the neighbourhood. Differences between gated communities, open infill complexes and individual infill housing blocks are analysed in terms of their impact on open public space.