Since the financial crisis of 2008, the debate around housing is reopened in the political discourses. This phenomenon highlights the difficulty of the modest households of finding a housing answering their needs and their financial capacities. In parallel, the rhythm of construction in France, estimated between 300,000 and 320,000 housing a year, seems currently insufficient to answer the request. Now, the challenges to produce accessible housing are based on the contribution to fluidify the residential courses of the modest households, on the alleviation of the social rental equipment, and finally on the reduction of housing’s budget. These challenges are strengthened in the cities where the urban tissue is already saturated, and where the land are gonna be scarce. That’s why urban planning and land’s control are essentials to produce and maintain an abordable offer Consequently, which are the strategies created by these cities to integrate accessible housing as well as possible? Through a glance related to the main tendencies (regulatory, tax, social…) as regards accessible housing, the ai mis to revelate the various tools and ressources mobilized to develop an accessible offer of housing. Those are gonna be examinate by the example of Pre-Nouvel Est in Seyssins. It’s define by the best urban project ever, based on social and political commitment. This work permit to reveals the importance of every partners in urban processus, in order to develop accessible housing in Seyssins. Moreover, we’ll se that the principal challenges appears in land’s control, consideration of every citizen, and finally in local initiatives.