CodeMandatory
Full bathroom minimum dimensions
CM-BATHROOM-MIN-01Description
Full bathrooms must have at least 35 sq ft and minimum 5 ft in any dimension to accommodate a 3-ft tub, 21 in toilet clearance, and 30 in vanity.
Why this exists
Full bathrooms need 35 sq ft and 5 ft minimum on any side to fit a 3-ft tub, 21-inch toilet clearance, and a 30-inch vanity.
Categories
Life safetyBathroom
Source
ICCno manifest entry
International Residential Code (2024)
Section: R307
Published 2026-05-09 · last verified 2026-05-09
Solver enforcement
The constraint solver runs check function cm-bathroom-min-01 as a hard constraint — layouts that fail are rejected outright.
Related directives
- Garage / dwelling fire separation · IRC R302.6
- Habitable space minimum ceiling height · IRC R305.1
- Egress window net opening dimensions · IRC R310.2
- Stair riser, tread, and headroom · IRC R311.7
- Smoke alarms required throughout dwelling · IRC R314
Last reviewed 2026-05-09.