This paper aims to describe the legislation of the social housing system in Slovakia and to analyse innovations in social housing provision. The paper contributes to the literature on innovative social housing solutions provided by non-governmental organisations (NGOs), or so-called third sector. The analysis reveals the main factors that may contribute to the success or failure of social innovations in housing provision by NGOs. Long-term community work, the education of future residents, and the participation of future residents in the construction of their homes are the main factors that support the spread of innovations in social housing. On the other hand, lack of cooperation from the government at all levels and low funding are the biggest constraining factors on innovation in social housing in Slovakia.