Familistic and individualistic theories both provide explanations for recent declines in family household formation. Securing access to housing plays a key role in new household formation for both these theories. Familistic theories hypothesize a positive relationship between access to housing and new family household formation. Individualistic theories hypothesize a positive relationship between access to housing and nonfamily household formation. Here I test these hypotheses in Sweden by modeling leaving home for family and nonfamily household formation using the Swedish Family Survey and supplemental housing data. I find significant support for the familistic notion that greater access to housing increases the likelihood of family household formation. I fail to find support for the individualistic theory. Copyright Springer Science+Business Media B.V. 2006Cohabitation, Family, Housing, Nest-leaving, Sweden,