Minimum room sizes, ceiling heights, hallways, stairs, and the NKBA kitchen and bath clearances that make a floor plan work.
The Room Planning section collects the dimensional rules that govern a U.S. house plan before any finish is chosen. The International Residential Code sets the floor of the discussion: a habitable room must contain at least 70 square feet and measure at least 7 feet across, ceilings in living space must clear 7 feet, hallways and stairs must be 36 inches wide, and the egress door must open 32 inches clear. The National Kitchen and Bath Association adds the planning layer on top of code, with 31 kitchen guidelines and a matching set for bathrooms that specify work aisles of 42 inches, landing areas of 15 to 24 inches beside appliances, 30 inches of clear floor in front of every bath fixture, and shower interiors of 36 by 36 inches. Each article in the section quotes the section number or guideline number, gives the number in inches and feet, and notes where the code minimum and the NKBA recommendation differ.
Articles in Room Planning
The articles in Room Planning are listed newest first, with the publication date and a one-sentence summary of each.
-
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 Room Dimension Standards (IRC)
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
Compare showerhead and bathroom faucet water use with EPA WaterSense flow limits, stated household assumptions, worked gallon totals and a downloadable worksheet.