The economic status of families with a child cystic fibrosis is compared with the situation for control families. The housing situation for the two groups is also evaluated. The study is based on questionnaires. The families with children with cystic fibrosis have a higher income than the controls, but they also have greater expenses. The increase is not only in expenses related to the treatment of cystic fibrosis but also in the general expenses related to having children, in the group of families with cystic fibrosis. The housing expenses are also greater in the families with children with cystic fibrosis; this is probably due to the fact that home treatment of cystic fibrosis adds certain demands to the quality of the housing conditions for these families.