Last reviewed: May 2026 — EgressUSA editorial team
- RCO (IRC 2021) · Ohio Egress Window Requirements
Ohio Egress Window Requirements — RCO (IRC 2021)
Ohio enforces the Residential Code of Ohio (RCO), based on IRC 2021, effective March 2024. The four core egress dimensions are the same as all IRC editions since 2012 — every EgressUSA kit meets all Ohio RCO requirements and ships free to all Ohio addresses.
- Enforces RCO (IRC 2021)
- Statewide Enforcement
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RCO IRC 2021 Section R310 — Required in OH
5.7 ft²
Minimum net clear opening area
R310.2.1
24 in
Minimum net clear height
R310.2.2
20 in
Minimum net clear width
R310.2.3
44 in
Max. sill height from finished floor
R310.2.4
- Ohio Egress Guide
- Ohio Quick Facts
- Yes
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Ohio Egress Window Requirements — RCO (IRC 2021)
Ohio enforces the Residential Code of Ohio (RCO) for single-family and two-family dwellings — Ohio’s own residential building code based on IRC 2021 with Ohio-specific amendments. The 2024 update took effect March 1, 2024, following adoption by the Ohio Board of Building Standards. If you are finishing a basement bedroom, preparing a home for sale, or bringing a rental unit into compliance anywhere in Ohio — your egress window must meet all four RCO Section R310 requirements.
An important distinction for Ohio: the Ohio Building Code (OBC) is Ohio’s commercial building code based on IBC 2021. The OBC does NOT govern single-family or two-family residential projects. Residential egress window requirements fall under the Residential Code of Ohio (RCO). Both are administered by the Ohio Board of Building Standards, but your permit application for a residential egress window goes through your local county or municipal building department under the RCO — not the OBC.
| Detail | Value |
|---|---|
Code enforced | RCO (IRC 2021) |
Governing code | Residential Code of Ohio (RCO) |
Adoption status | Updated to 2024 Residential Code of Ohio (based on IRC 2021) effective March 1, 2024 |
Scope | Statewide — enforced at county and municipal level |
Permit required | ✓ Yes — virtually all jurisdictions |
- Permit note: A building permit is required in virtually all Ohio jurisdictions for egress window installation. Permits are issued at the local level through county or municipal building departments. Contact your local building department before work begins — Ohio does not have a statewide permit office.
The 4 Required Egress Window Dimensions in Ohio
Ohio enforces the RCO (IRC 2021) which requires every basement sleeping room to have an emergency escape and rescue opening meeting all four of the following criteria simultaneously. A window that meets three out of four still fails inspection.
5.7
ft²
- R310.2.1
24
inches
- R310.2.2
20
inches
- R310.2.3
44
inches
- R310.2.4
- Every EgressUSA kit meets all four requirements. Our kits are pre-verified to Ohio RCO (IRC 2021) Section R310 before they ship. They are designed to pass your local building inspection on the first visit — guaranteed. Shop compliant kits →
Window Well Requirements (R310.4)
When the egress window opening is below grade — which applies to virtually every basement installation — RCO IRC 2021 also requires a window well with: minimum 9 square feet floor area, minimum 36-inch width and projection from the foundation wall, and a permanently affixed ladder if the well depth exceeds 44 inches.
Ohio-Specific Amendments & Important Notes
While Ohio enforces the RCO (IRC 2021), there are important state-specific considerations every homeowner and contractor must be aware of before starting an egress window project
- Amendment 1 — RCO vs OBC: Ohio enforces the Residential Code of Ohio (RCO) for one- and two-family dwellings — not the Ohio Building Code (OBC), which covers commercial construction. The RCO is based on IRC 2021 with Ohio-specific amendments effective March 1, 2024. Always reference the RCO for residential egress window projects, not the OBC.
- Amendment 2 — Ohio Energy Code: Ohio's energy code requires egress window installations to meet Ohio-specific U-factor and Solar Heat Gain Coefficient (SHGC) requirements in addition to RCO R310 dimensional requirements. Ohio is divided into climate zones — U-factor requirements may vary slightly by zone. All Egress Pros windows sold by EgressUSA are dual-pane Low-E insulated and meet Ohio energy code requirements in all climate zones.
- Amendment 3 — Local Permits: Building permits in Ohio are issued at the county or municipal level — there is no statewide permit office. Some Ohio counties and municipalities have their own building departments; others use third-party inspection services. Contact your local jurisdiction before starting work. Permit fees for egress window installation in Ohio typically range from $75–$250.
- Always verify with your local building department. State code adoption data changes. Local amendments can add stricter requirements beyond the state standard. Contact your local code enforcement officer before purchasing or installing. Our team at 1-877-534-7377 can also help you navigate Ohio requirements.
Key Cities in Ohio — Local Code Notes
Even within Ohio’s statewide RCO, permits and enforcement are handled at the county or municipal level. Here are Ohio’s key markets and what you need to know for each. Here are the key markets and what you need to know for each.
Columbus / Franklin County
Cleveland / Cuyahoga County
Cincinnati / Hamilton County
Toledo / Lucas County
Akron / Summit County
Dayton / Montgomery County
- Your city or county not listed? Contact your local county or municipal building department directly. Ask: (1) which RCO edition are you enforcing? and (2) are there local amendments to Section R310? Call us at 1-877-534-7377 and we can help you interpret the answer.
Permits & Inspection in Ohio
A building permit is required in virtually all Ohio jurisdictions for egress window installation. Egress window installation involves cutting through a structural foundation wall — this is universally classified as a structural alteration and triggers the permit requirement. Working without a permit creates risk of forced removal, insurance voidance, and complications at sale.
A building permit is required in virtually all Ohio jurisdictions for egress window installation. Egress window installation involves cutting through a structural foundation wall — a structural alteration that triggers permit requirements under the Ohio RCO. Working without a permit creates risk of forced removal, insurance voidance, and complications at sale.
What to Submit for Your Permit Application
Most Ohio counties and municipalities require the following for an egress window permit application:
- Site plan showing window location and dimensions relative to foundation walls
- Window specification sheet showing net clear opening dimensions (included with all EgressUSA kits)
- Contractor's license number (if using a licensed contractor — recommended for foundation cutting)
- Permit application fee (varies by municipality — typically $75–$250 in Ohio)
- EgressUSA kits include full specification sheets with all four Ohio RCO (IRC 2021) dimensional compliance values, suitable for direct submission with your permit application. Every kit is pre-verified to pass Ohio local building inspection on the first visit.
- Need a licensed installer in Ohio?
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Ohio Egress Window Requirements — FAQ
Common questions about Ohio egress window code, permits, and compliance
What egress window code does Ohio enforce?
What is the difference between the Ohio Building Code (OBC) and the Residential Code of Ohio (RCO)?
Do I need a building permit for egress window installation in Ohio?
Does Ohio require egress windows in basement bedrooms?
When did Ohio update its residential building code?
Does EgressUSA ship egress window kits to Ohio?
Neighboring States
Michigan
IRC 2015
Pennsylvania
IRC 2021
West Virginia
IRC 2018