General information for homeowners, not legal or engineering advice. Permit rules change and vary by municipality; check with Louisville Metro or your city’s permit office before you start work.
Cutting a new egress window or enlarging a basement window changes a foundation wall, so it usually needs a building permit. Who issues it depends on where in Jefferson County you live. This guide gives a general, plain-English overview. Always confirm with the permit office for your address before work begins, because rules and fees change.
Who handles permits
- Louisville Metro: Louisville and Jefferson County merged into one Metro government, and Louisville Metro handles building permits and inspections for much of the county.
- Small cities: Jefferson County also has many small incorporated cities, such as St. Matthews, Jeffersontown, Anchorage and others. Some have their own rules or extra steps, so check whether your address has any.
- Statewide rules: Kentucky adopts a statewide residential building code based on the national model code, which local offices enforce.
When a permit is usually needed
As a general rule, expect a permit for:
- Cutting a new opening in a foundation wall
- Enlarging an existing basement window opening
- Finishing a basement or adding a basement bedroom, where the egress window is part of a bigger project
A same-size window swap often doesn’t need one. Treat this as a starting point, not a final answer. The permit office’s rules are what count.
What the inspector looks at
- That the window’s clear opening, width, height and sill height meet the code
- That the window opens easily from inside
- That the window well is large enough, with a ladder or steps if needed
- That the cut opening is properly supported
Other things to check
- Property lines and setbacks: a window well near a side property line may need extra thought.
- Historic districts: some Louisville neighborhoods are in historic preservation districts. Exterior changes there may need extra review.
- Utilities: contact Kentucky 811 before digging so buried lines are marked.
- Drainage: water from the well should not be sent onto a neighbor’s property.
- Contractor credentials: ask for proof of insurance and confirm any local license or registration the work requires.
Let the contractor help
Experienced local egress window contractors deal with permits regularly and can usually tell you quickly what your project needs. Ask who will pull the permit and whether fees are included in the estimate. Read egress window cost in Louisville for what else belongs in a fair quote, then request a free written estimate fora new egress window or an enlarged basement window.