The aim of this paper is to present evidence on the effects on wellbeing of providing a basic dwelling on-site to households living in situations of extreme poverty in urban slums. In particular, the paper evaluates the impact of the NGO TECHO's emergency housing programme in informal settlements of Buenos Aires, Argentina. Using a quasi-experimental pipeline approach, the paper shows that the programme has a large effect on privacy, security, interpersonal relations, psychological wellbeing and perception of quality of life. In health the program only produces a reduction in the prevalence of cough and congestion. While indicators of sleep quality improve, the effects are not statistically significant after adjusting for multiple hypothesis testing. Additionally, the programme increases the likelihood that households with school age children have a tranquil place to study, evidence that the programme could broaden children's long-term opportunities.