CodeMandatory
Egress-window wells
IRC R310.2.4Description
Window wells for basement egress must have ≥9 sq ft area, ≥36" projection from foundation, and a permanent ladder or steps if the well is >44" deep.
Why this exists
Below-grade escape needs a flat surface to stand on plus a way out of the well. Without these the egress window is theatre.
Measurements
| Property | Operator | Value | Unit | Note |
|---|---|---|---|---|
minWellArea | min | 9 | sq_ft | |
minProjection | min | 36 | in |
Categories
Life safetyEgress
Source
ICCno manifest entry
International Residential Code (2024)
Section: R310.2.4
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.