Egress Window Requirements by State
Egress window requirements are based on IRC Section R310, which has been adopted in some form by all 50 states. However, the specific edition of the IRC, local amendments, and enforcement practices vary. This page covers key state-by-state variations.
How State Adoptions Work
The IRC is a model code published by the International Code Council (ICC). States adopt it (with or without amendments) as their residential building code. The egress provisions in IRC R310 have been largely consistent across editions, so the core dimensions — 5.7 sq ft net clear opening, 24" minimum height, 20" minimum width, 44" maximum sill height — apply in virtually every jurisdiction.
| State | Current IRC Edition | Egress Dimensions | Notable Amendments |
|---|---|---|---|
| California | CRC (based on 2022 IRC) | Standard IRC R310 | California Residential Code applies; same egress dimensions |
| Florida | FBC (8th Ed.) | Standard IRC R310 | Same dimensions; permit always required |
| Texas | Varies by municipality | IRC R310 where adopted | No statewide code; major cities use IRC |
| New York City | NYC Building Code | More stringent in some respects | NYC has own code with additional fire egress requirements |
| Wisconsin | Comm 21 (DSPS) | Equivalent to IRC R310 | Wisconsin Uniform Dwelling Code mirrors IRC egress provisions |
| All other states | IRC 2015–2021 | Standard IRC R310 | Check local amendments; core dimensions consistent |
The Grade-Floor Exception: Often Misunderstood
IRC R310.2.1 allows a reduced net clear opening area of 5.0 sq ft (instead of 5.7 sq ft) for windows at grade floor level where the sill is no more than 44" above or below the finished grade outside. Some jurisdictions interpret this narrowly; others apply it broadly. Always confirm the applicable provision with your permit office rather than assuming the exception applies.
Municipalities with Stricter Rules
New York City's Building Code requires egress windows to be openable from both inside and without a key, tool, or special knowledge — the same as IRC. However, NYC also has additional provisions for fire escapes, secondary egress, and high-rise buildings that go beyond IRC. Chicago has similar supplemental provisions for multi-family buildings. Always check local amendments for your specific jurisdiction.
FAQs
No — the core egress dimensions in IRC R310 (5.7 sq ft, 24" height, 20" width, 44" sill height) have been unchanged through the 2006, 2009, 2012, 2015, 2018, and 2021 editions. The energy code requirements changed significantly between editions, but egress dimensions did not. You can rely on the standard dimensions regardless of which IRC edition your state has adopted.