Kenya adopted a new consitution in 2010 which protects the right to housing and sanitation.
The case brought by the Mukuru residents may have far-reaching implications in a city where 60 percent of the population live in slums.
This short film, made by the UN's IRIN agency, portrays the struggle of the Mukuru residents and the work of inspirational community leader Jack Evans Omondi Papa.
This video is part of IRIN's "No Ordinary Election" series. Catch up with the whole special series here.