Egress Window Requirements in Michigan: A Grand Rapids Guide
Finishing a basement is one of the most common projects in Grand Rapids-area ranches and split-levels, and the egress window is where many of those plans hit the code. If you want a bedroom, an office or a family room down there, Michigan's residential code has specific rules for how people get out in an emergency. This guide explains when you need an egress window, the size rules, the permit and what the work usually costs.
Grand Rapids Window Pros is a free matching service, not a contractor or a code official. Building departments make the final call. Use this guide to ask better questions, then confirm the details with your city or township.
When Michigan requires an egress window
The 2021 Michigan Residential Code took effect on August 29, 2025. The basic rule, as the state's Bureau of Construction Codes has explained it: "basements with habitable space and every sleeping room" must have at least one openable emergency escape window or exterior door.
- Needs one: a basement bedroom, and a basement finished as living space such as a family room or office.
- Usually doesn't: a basement used only for storage, laundry, mechanical equipment or a toilet room.
- Each bedroom counts. A basement with two bedrooms needs an escape opening in each sleeping room.
An existing small basement window almost never qualifies. Most egress projects mean cutting the foundation to make the opening larger and deeper.
Egress window size requirements
These are the model-code dimensions (IRC section R310) that Michigan's code is based on. Michigan amendments and local enforcement can differ, so treat this as a starting point and confirm with your building department.
| Requirement | Minimum or maximum |
|---|---|
| Net clear opening | At least 5.7 sq ft (5.0 sq ft at grade floor) |
| Clear opening height | At least 24 inches |
| Clear opening width | At least 20 inches |
| Sill height above the floor | No more than 44 inches |
| Window well area | At least 9 sq ft, with at least 36 inches of projection from the wall |
| Well deeper than 44 inches | Needs a permanent ladder or steps |
"Net clear opening" is the space you can actually climb through with the window fully open, not the size of the frame. That's why window style matters.
Which window styles work best for egress
- Casement: opens fully on a hinge, so a smaller frame can reach the clear-opening minimum. A common choice for basements.
- Sliding: only half the window opens, so the frame has to be wider.
- Double-hung: only half opens vertically, which makes the 24-inch height hard to reach in a basement wall.
Ask installers to state the net clear opening of the exact unit they propose, not just the frame size. The window styles guide explains how each type operates.
Permits and inspections
An egress window requires a permit and must meet Michigan Residential Code sizing. Cutting a foundation is a structural change, and the City of Grand Rapids says a building permit is required "for any project that you're planning to change the structure of your house." In the city, permits are pulled by the owner-occupant or a licensed residential builder, and landlords need a licensed contractor to pull permits for rentals. Call the Grand Rapids Development Center at 616-456-4100, or your township or city building department in Wyoming, Kentwood, Walker and other suburbs.
Check the contractor, too. In Michigan, a contractor replacing windows on your home generally needs a state residential builder or maintenance & alteration license (jobs of $600 or more). Ask for the license number and check it on LARA's license lookup (or call 517-241-9316). Before digging, the contractor should call MISS DIG 811 to have buried utilities marked.
What an egress window project costs
| Item | Typical range | Source |
|---|---|---|
| Egress window, window only | $300–$1,500 | Fixr, Jan 2026 |
| Excavation + window well | $3,000–$7,000 | This Old House, 2026 |
| Permit | $100–$500 | This Old House, 2026 |
Most of the cost is digging and cutting, not the window. Things that push a quote up: a poured or block wall that needs a new header, a tight side yard, drainage at the bottom of the well, landscaping, and interior drywall and trim around the new opening. The egress and basement windows page goes deeper on the work itself, and the cost guide has the full price table.
Grand Rapids-area basements and egress
A lot of the area's housing was built in the decades when basements were for storage. Wyoming's median home dates to 1969 and Jenison's to 1973, with plenty of ranches and split-levels whose basements are now being finished. Many of those houses were built before 1978, so if the project disturbs painted surfaces, federal law requires the installer to be an EPA Lead-Safe Certified Firm (EPA runs this program in Michigan).
West Michigan's 77.6 inches of average snowfall also matters. A good well cover keeps snow and water out while still opening easily from inside, and the well needs a path to drain. Ask how each company handles both.
Questions to ask before you sign
- What is the net clear opening of the window you're proposing?
- Who pulls the permit, and is the inspection included?
- How will you cut the foundation, and is a header or reinforcement needed?
- How will the well drain, and what cover do you recommend?
- Is interior finish around the opening included?
If you sign at home, Michigan law lets you cancel until midnight of the third business day (MCL 445.112). When you're ready, describe your basement project and independent installers can reply with quotes, or call (616) 616-5192.
Frequently asked questions
Does a basement bedroom need an egress window in Michigan?
Yes. The Michigan Residential Code requires basements with habitable space and every sleeping room to have at least one openable emergency escape window or exterior door. Storage, utility and toilet-only basements don't need one.
What size does an egress window have to be in Michigan?
The model code used in Michigan calls for at least 5.7 square feet of net clear opening (5.0 at grade floor), at least 24 inches of clear height and 20 inches of clear width, with a sill no higher than 44 inches. Confirm current requirements with your building department.
Do I need a permit for an egress window in Grand Rapids?
Yes. Cutting or enlarging a foundation opening changes the structure of the house, so an egress window requires a permit and must meet Michigan Residential Code sizing. Contact the Grand Rapids Development Center at 616-456-4100 or your local building department.
How much does an egress window cost?
Fixr lists $300 to $1,500 for the egress window itself (January 2026). This Old House puts excavation and the window well at $3,000 to $7,000 and permits at $100 to $500 (2026). Concrete cutting, drainage and interior finish can add more.