# Interior Design U.S.

> US residential interior reference: room dimensions, kitchen and bathroom planning, accessibility, lighting and renovation costs, with dated source links.

## Sections

- [Room Planning](https://interior-design.us.org/room-planning/): Minimum room sizes, ceiling heights, hallways, stairs, and the NKBA kitchen and bath clearances that make a floor plan work.
- [Codes and Standards](https://interior-design.us.org/codes-and-standards/): Accessibility clearances from the 2010 ADA Standards and ICC A117.1, and residential lighting levels from the IES, with the numbers behind each rule.
- [Costs and Contracts](https://interior-design.us.org/costs-and-contracts/): Trade wages by state from the BLS, remodel job costs by region from Cost vs. Value, and the clauses a residential design agreement must contain.

## Articles

- [ADA and ICC A117.1 Accessibility Clearances](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.
- [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.
- [Interior Labor and Remodel 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.
- [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.
- [Residential Lighting Levels in 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.
- [Residential Room Dimension Standards (IRC)](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.
- [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.

## Index pages

- [All articles](https://interior-design.us.org/articles/): every article on the site in one list, grouped by section.
- [About this site](https://interior-design.us.org/about/): who publishes the site, what it covers, and how sources are chosen.
- [Editorial policy](https://interior-design.us.org/editorial-policy/): sourcing rules, correction handling, and what the site does not do.

Contact: info@interior-design.us.org