Home Internet Accessibility Act This bill requires the Government Accountability Office (GAO) to report on broadband internet capacity in housing that is supported by the Department of Housing and Urban Development (HUD) or the Department of Agriculture. In its report, the GAO must identify such housing that lacks broadband capacity and estimate the costs and time frame necessary to provide broadband capacity in such housing. Additionally, HUD must develop a plan for retrofitting such housing to provide the capacity for broadband internet.