Table 8.4.6 – National Costs for Federal, State, and Local Government Housing Revision: Water Closet Clearance Assumptions: Number of Dwelling Units with Mobility Features or Communication Features Affected: 1,238 Dwelling Units with Mobility Features National Costs Compared to: Current Guidelines Upper Bound $354,068 IBC 2000 & 2003 Lower Bound $354,068 Revision: Shower Spray Controls Assumptions: Number of Dwelling Units with Mobility Features or Communication Features Affected: 4,950 Dwelling Units with Mobility Features National Costs Compared to: Current Guidelines Upper Bound $796,950 IBC 2000 & 2003 Lower Bound $796,950 Revision: Galley Kitchen Clearance Assumptions: Number of Dwelling Units with Mobility Features or Communication Features Affected: 3,713 Dwelling Units with Mobility Features National Costs Compared to: Current Guidelines Upper Bound $3,687,009 IBC 2000 & 2003 Lower Bound $3,687,009 Revision: Doorbells with Audible and Visual Signals and Door Peepholes Assumptions: Number of Dwelling Units with Mobility Features or Communication Features Affected: 990 Dwelling Units with Communication Features That Have Doorbells with Audible Signals and Door Peepholes National Costs Compared to: Current Guidelines Upper Bound $95,040 IBC 2000 & 2003 Lower Bound $95,040 Assumptions: Number of Dwelling Units with Mobility Features or Communication Features Affected: 990 Dwelling Units with Communication Features That Have No Doorbell and No Door Peephole National Costs Compared to: Current Guidelines Upper Bound $318,780 IBC 2000 & 2003 Lower Bound $318,780 Revision: Voice Communication System at Entry Support TTY Communication Assumptions: Number of Dwelling Units with Mobility Features or Communication Features Affected: 495 Dwelling Units with Communication Features in Facilities That Have Voice Communication System at Entry to Site, Building, or Floor National Costs Compared to: Current Guidelines Upper Bound $174,735 IBC 2000 & 2003 Lower Bound $174,735 Total (Millions) National Costs Compared to: Current Guidelines Upper Bound $5.4 IBC 2000 & 2003 Lower Bound $5.4