Michigan Egress Window Code and Permit Guide

Michigan builds on the International Residential Code, and egress requirements live in Section R310, Emergency Escape and Rescue Openings. This guide covers where an opening is required, the minimums the code sets, and how a permit is pulled in the Lapeer area.

Where an Emergency Escape Opening Is Required

• Every sleeping room, on every floor, including basements.
• Basements with habitable space, such as a finished family room, office or exercise room, even if no one sleeps there.
• The opening has to reach directly outside, open from the inside without keys or tools, and work using nothing but normal operation.

An unfinished basement used only for storage and utilities does not trigger the requirement. The moment it is finished or a bedroom is added, it does.

The Code Minimums

Bars, grilles, covers or screens over the opening are allowed only if they release from inside without a key, tool or special knowledge and still leave the full clear opening.

Getting a Permit in Lapeer County

An egress project that cuts or enlarges a foundation opening is structural work and needs a building permit. Who issues it depends on where the house is:

What the Inspector Checks

• The measured clear opening at the fully open window, not the product spec sheet.
• Sill height from the finished floor.
• Well size, and a ladder if the well is over 44 inches deep.
• That the window and any cover open from inside with no tools.
• Header and structural support over the new opening.
• For a new bedroom, smoke and carbon-monoxide alarms, ceiling height and a second way out.

Egress for a Legal Bedroom

An egress window is one requirement for calling a basement room a bedroom, not the only one. The room also needs a minimum floor area and ceiling height, interconnected alarms, and in many appraisals a closet. If the goal is a bedroom that counts for resale, plan the whole room to code. See basement bedroom egress windows.

Code and Permit FAQs

Do I need a permit to replace a basement window the same size?

A like-for-like replacement in an existing compliant opening is usually a minor permit or none, depending on the jurisdiction. Enlarging the opening always needs a structural permit.

Can I do the work myself?

Michigan lets a homeowner pull a permit for their own primary residence, but the structural cut, waterproofing and inspections still have to meet code.

Which code edition does Michigan use?

Michigan adopts the Michigan Residential Code, based on the International Residential Code. Egress rules are in Section R310. Local departments confirm the current edition.

What if my basement is already finished without egress?

A finished basement with habitable space is supposed to have an emergency escape opening. Adding one after the fact is common and is the main reason homeowners call.

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