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Resolve the property
Match the address to its parcel, zoning context, and responsible permit authority.
What we check
What your jurisdiction checks
Net Clear Opening
The usable opening, not the rough window size, is what matters. Many jurisdictions use 5.7 sq ft net clear opening, 24 inches minimum clear height, and 20 inches minimum clear width. Casement windows often work better than sliders because they create more clear opening in a smaller frame.
Sill Height
The bottom of the clear opening is typically limited to 44 inches above the finished floor. If the sill is too high, the window may not count as emergency escape and rescue access even if the glass area looks large enough.
Window Well Size
Basement egress windows usually need a window well with enough clear area for escape and rescue access. A common minimum is 9 sq ft of horizontal area, with 36 inches minimum projection and width, but local rules and product approvals can vary.
Ladder or Steps
If the window well is deeper than 44 inches, most codes require a permanently attached ladder or steps. The ladder has spacing, projection, and width rules and cannot block the required clear opening.
Foundation Cutting and Structure
Cutting a foundation wall can require a header, lintel, engineer review, or product-specific installation details. The permit reviewer may ask for drawings showing the opening, well, drainage, and structural support.
Drainage and Location
Window wells need drainage so they do not become water traps against the foundation. Placement can also be limited by setbacks, utilities, easements, driveways, decks, and other site constraints.
Process
When an Egress Window Becomes a Permit Problem
The project is highest risk when a homeowner is converting a basement room into a bedroom. That can trigger building, electrical, smoke/CO alarm, insulation, stair, ceiling height, and emergency escape checks in the same review. The window is only one part of the basement permit path.
Per state
State-specific notes
IL
Illinois
Most local building departments require a permit when cutting or enlarging a foundation opening. Chicago and many suburbs have local amendments, contractor registration rules, and inspection sequencing that can change the submittal package.
Explore Illinois permit rules
WI
Wisconsin
Wisconsin UDC rules apply to one- and two-family dwellings, and local inspectors may require details for the window, well, drainage, and basement room use before approval.
Explore Wisconsin permit rules
IN
Indiana
Indiana requirements vary by city, county, and local code adoption. Many AHJs still require a permit for foundation work, basement finishing, and sleeping-room conversion even when the window product is premanufactured.
Explore Indiana permit rulesWatch for these
Common egress window permit mistakes
- Buying a window that does not meet net clear opening requirements
- Forgetting that the well, ladder, and drainage are part of the permit review
- Cutting the foundation before the permit is issued
- Assuming an egress window alone makes a basement bedroom legal
- Installing the sill too high above the finished basement floor
Done for you · from $199
Check the Egress Window Permit Path Before You Cut Concrete
Our permit experts research the exact requirements for your address, including clear opening size, window well rules, drainage expectations, basement bedroom triggers, and required inspection steps.
Our DIY Permit Package currently covers sheds and garages. For egress window permits, our Done-For-You team handles the research and filing guidance.
Request a egress window permit quote
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For contractors
Basement Contractors: Stop Rechecking Egress Rules From Scratch
Egress windows touch code, excavation, foundation cutting, inspections, and bedroom legality. Use Permitech to turn every local requirement into a repeatable permit path before the homeowner signs.
Our self-serve subscription plans currently cover sheds and garages. For egress window permits and other project types, we work with contractors on a custom contract basis tailored to your volume and service area. Fill out the quote form above and select "Contractor", and we’ll put together a plan that fits your operation.
Request a custom contractor quote500+ permits per year, in person
Built by a former permit tech who processed 500+ building permits per year across IL, WI, and IN. We don't just check if you need a building permit, we check zoning too.