CodeMandatory
Stairway and ramp area lighting
IRC R303.7Description
Stairway and ramp areas must have artificial light providing ≥1 footcandle at the tread and landing centerlines.
Why this exists
Beyond the switched-light requirement, the actual delivered light must be sufficient to see treads.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
minFootcandles | min | 1 | fc |
Categories
Life safetyCirculation
Source
ICCno manifest entry
International Residential Code (2024)
Section: R303.7
Published 2024-01-01 · last verified 2026-05-09
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
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.