https://interior-design.us.org/ US residential interior reference: room dimensions, kitchen and bathroom planning, accessibility, lighting and renovation costs, with dated source links. en-us https://interior-design.us.org/codes-and-standards/accessibility-clearances-ada-a117/ https://interior-design.us.org/codes-and-standards/accessibility-clearances-ada-a117/ Clear floor space, turning space, door widths, reach ranges, and toilet, shower, and kitchen clearances from the 2010 ADA Standards and ICC A117.1-2017. Sun, 13 Sep 2026 00:00:00 GMT https://interior-design.us.org/costs-and-contracts/how-to-read-an-interior-design-contract/ https://interior-design.us.org/costs-and-contracts/how-to-read-an-interior-design-contract/ What a residential interior design contract contains: ASID package schedules, hourly, flat, percentage, and cost-plus fees, retainers, markups, and 16 CFR 429. Sun, 13 Sep 2026 00:00:00 GMT https://interior-design.us.org/costs-and-contracts/interior-material-and-labor-costs-by-region/ https://interior-design.us.org/costs-and-contracts/interior-material-and-labor-costs-by-region/ May 2025 BLS wages for painters, carpenters, electricians, plumbers, and tile setters by state, 2025 Cost vs. Value remodel costs by region, NAHB finish costs. Sun, 13 Sep 2026 00:00:00 GMT https://interior-design.us.org/room-planning/nkba-kitchen-and-bath-planning-guidelines/ https://interior-design.us.org/room-planning/nkba-kitchen-and-bath-planning-guidelines/ The NKBA kitchen and bathroom planning guidelines in numbers: work aisles, work triangle, landing areas, storage frontage, fixture clearances, and grab bars. Sun, 13 Sep 2026 00:00:00 GMT https://interior-design.us.org/codes-and-standards/residential-lighting-levels-footcandles/ https://interior-design.us.org/codes-and-standards/residential-lighting-levels-footcandles/ IES-based footcandle ranges by room, the lumen math for typical room sizes, bulb equivalents, Kelvin and CRI, and the 1 footcandle stair rule in the IRC. Sun, 13 Sep 2026 00:00:00 GMT https://interior-design.us.org/room-planning/residential-room-dimension-standards/ https://interior-design.us.org/room-planning/residential-room-dimension-standards/ Minimum room area, ceiling height, hallway, stair, door, and egress window dimensions from the 2021 IRC, plus the clearances NKBA and ICC A117.1 add above code. Sun, 13 Sep 2026 00:00:00 GMT https://interior-design.us.org/room-planning/watersense-bathroom-water-worksheet/ https://interior-design.us.org/room-planning/watersense-bathroom-water-worksheet/ Compare showerhead and bathroom faucet water use with EPA WaterSense flow limits, stated household assumptions, worked gallon totals and a downloadable worksheet. Sun, 13 Sep 2026 00:00:00 GMT