Egress Window Cost in Wisconsin: 2026 Installed Pricing
An egress window costs about $4,216 to install on average, with most jobs between $2,718 and $5,878, according to This Old House's 2026 cost guide. A basement window below grade costs more, because it needs a window well and digging: the same guide puts a below-grade basement egress window at $2,500 to $5,000 with a prefabricated well and window, and $3,000 to $7,500 for a custom one. Where your project lands depends on four things: how much digging the well needs, the foundation cut, the window you choose, and Wisconsin's size rules for the opening.
Published 2026-08-01 · 8 min read · 1,900 words
Basement project - T&JEgress Window Cost at a Glance
| What you are paying for | Published 2026 figure |
|---|---|
| Average installed egress window | $4,216 |
| Typical installed range | $2,718-$5,878 |
| Basement egress window below grade, prefab | $2,500-$5,000 |
| Basement egress window below grade, custom | $3,000-$7,500 |
| Excavation, including installing the window well | $3,000-$7,000 when significant digging is needed |
| Building and excavation permits | $100-$500, depending on the community |
These are national figures from This Old House, not Wisconsin quotes. They are the best published yardstick for comparing the bids you get here, and the sections below explain why one Wisconsin basement can land near the low end while another lands near the top.
In This Old House's survey of homeowners who recently bought windows, more than 40% said their egress window installation took 2 to 3 days to complete.
What an Egress Window Installation Includes
A basement egress window is several jobs in one. A complete quote should show each of these as its own line, so you can compare bids on the same work.
Digging the window well.
The ground outside the window is dug out so a well can sit against the foundation. This is the line that moves the most: This Old House puts excavation, including the labor to install the well, at $3,000 to $7,000 when a project needs significant digging.
Cutting the foundation.
A new opening is cut in the basement wall, and a header or lintel is set above it to carry the wall.
The window itself.
Casement windows swing fully open, so they give the most clear opening for their size. This Old House's 2025 survey put the average window at $397 for a single-hung, $495 for a double-hung, $507 for a slider and $560 for a casement.
The window well and cover.
Wells are usually galvanized steel or fiberglass kits, and a cover keeps out snow, leaves and small animals.
Drainage.
The bottom of the well needs a way to drain, such as gravel or a drain pipe, so water does not collect against the window.
Permit and inspections.
Budget $100 to $500 for building and excavation permits, depending on where you live.
Interior finishing.
In a finished basement, the drywall, trim and paint around the new opening are extra work that the base price may not include.
Basement - T&JWisconsin Egress Rules That Set the Size, and the Cost
Wisconsin's Uniform Dwelling Code requires a basement used for sleeping to have at least 2 exits. One must be a door to the outside or a stairway or ramp to the floor above; the second can be another of those, or an egress window that meets the size rules, located in each bedroom. The rules decide how big the window and the well have to be, so they set much of the price.
| Wisconsin requirement (SPS 321.03) | Figure |
|---|---|
| Net clear opening of the window | At least 20 by 24 inches, either way up |
| Height of the bottom of the opening above the floor | No more than 60 inches |
| Step or platform under the window | Required if the opening is more than 46 inches up; a flat surface at least 20 inches wide and 9 inches deep, no more than 24 inches above the floor |
| Window well width | At least as wide as the window |
| Window well depth out from the wall | At least 36 inches |
| Ladder or stair in the well | Required only if the well is deeper than 46 inches |
| Ladder rungs | At least 12 inches wide inside, at least 3 inches out from the wall, no more than 12 inches apart |
| Window under a deck or porch | A clear path at least 36 inches high and 36 inches wide, no more than 15 feet long, to a yard or open space |
Many national guides quote a 5.7 square foot opening, a 44-inch sill, a ladder in any well deeper than 44 inches and rungs up to 18 inches apart. Those are the national model code's figures. Wisconsin's own code is different, so measure every quote and window against the Wisconsin numbers above.
The net clear opening is the open space when the window is fully open, not the size of the frame. Wisconsin does not let any part of the window, including stops, stools, meeting rails and operator arms, intrude on it. Check the manufacturer's rated egress opening before you order, because a window that looks big enough can come up short once the sash and frame are subtracted.
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What will your egress window cost?
Every figure here is this article's own: $2,509 to $5,251 per window with the well and permit included, adjusted for the drivers it names.
These are approximate planning figures based on what you entered. Every project has details a calculator cannot see, so send us yours and we will put an exact written number to it.
What Makes One Quote Higher Than Another
- Well depth. The deeper the basement floor sits below grade, the deeper the well and the more digging. A well deeper than 46 inches also needs a ladder or stair.
- Foundation type. Cutting a poured concrete wall and cutting a block wall are different jobs, so ask how your wall will be cut and supported.
- What is in the way. A deck, porch, patio, air conditioner or gas meter near the window adds work. A window under a deck also needs a clear path at least 36 inches high and 36 inches wide out to the yard.
- New opening or enlarged window. Replacing a small basement window can cost less than cutting a brand-new opening, because the opening can sometimes be enlarged downward without a new header. You still need a well unless the whole window is above grade.
- How many windows. Installing more than one at a time can save on labor.
- Finished or unfinished basement. Patching drywall and trim in a finished room adds cost; in an unfinished basement it does not.
Do You Need a Permit for an Egress Window in Wisconsin?
Expect to. Cutting a new opening in a foundation wall is an alteration, and building permits for homes are issued by your city, village or town, not by Waukesha County. The inspector checks the opening size, the sill height and the well, which is what makes a basement bedroom count on paper. If you skip the permit, a home inspector can flag the room when you sell.
If you are finishing the whole basement, plan the egress window with the rest of the project. Cutting it in before the drywall goes up avoids tearing out finished walls later. Our basement finishing cost guide for Waukesha County covers the bigger budget, and our article on whether finishing a basement is worth it in Wisconsin helps with the decision.
Basement - T&JKeep the Window Well Dry
A window well is a hole next to your foundation, so drainage matters as much as the window. Wisconsin's code requires the well to be built so water that gets into it does not enter the house. Ask how the well will drain and whether a cover is included. If your basement already takes on water, fix that first; our basement waterproofing cost guide explains the options.
5 Questions to Ask Before You Sign an Egress Window Quote
Does the price include the permit and inspections?
If it is not written down, assume it is not included.
How will the foundation be cut and supported?
Ask about the header or lintel over the new opening.
What is the well made of, how deep is it, and is a cover included?
If it is deeper than 46 inches, the ladder or stair should be in the price.
How will the well drain?
Gravel, a drain pipe or a connection to existing drainage should be spelled out.
What happens inside?
In a finished basement, get the drywall, trim and paint work in writing.
Getting a Firm Number
Published averages are a starting point, but your well depth, foundation and yard decide the real price. A free in-home consultation is the way to get a number for your basement in Waukesha County, with every line of the job spelled out.
T&J is a father-and-son team that has worked in Wisconsin since 1989. John is your single point of contact from the first call through the final walkthrough, Telli is on site running the work, and T&J gives a written 2-year warranty. See our basement remodeling services or request a free in-home estimate.
Basement - T&JFrequently asked questions
How much does an egress window cost in Wisconsin?
This Old House's 2026 guide puts the average installed egress window at $4,216, with most jobs between $2,718 and $5,878. A below-grade basement egress window runs $2,500 to $5,000 with a prefabricated window and well, or $3,000 to $7,500 custom.
Why is a basement egress window so expensive?
Because it is more than a window. The job includes digging outside, cutting the foundation, setting a header, installing a window well with drainage, the permit and often interior finishing. The digging and well alone can run $3,000 to $7,000 when a project needs significant excavation.
How much does excavation for an egress window cost?
This Old House puts excavation, including the labor to install the window well, at $3,000 to $7,000 for projects that need significant digging. A shallower basement needs less.
What size does an egress window need to be in Wisconsin?
Wisconsin requires a net clear opening of at least 20 by 24 inches, either way up, with the bottom of the opening no more than 60 inches above the floor. If it is more than 46 inches up, a permanent step or platform is required. There is no square-foot minimum in Wisconsin's rule.
When does a window well need a ladder in Wisconsin?
Only when the well is deeper than 46 inches; a stair can be used instead of a ladder. The well also has to be at least as wide as the window and extend at least 36 inches out from the wall, and ladder rungs can be no more than 12 inches apart.
Do I need a permit for an egress window?
Expect to need one. Permits for homes are issued by your city, village or town, and building and excavation permits typically cost $100 to $500 depending on the community.
How long does egress window installation take?
More than 40% of homeowners in This Old House's survey said the installation took 2 to 3 days. Add time for the permit before work starts, and for finishing work in a finished basement.
Pricing is based on our own recent projects, cross-checked against 5 independent sources. Written by John (PM, 14 yrs) and reviewed by Telli, who has been remodeling in Wisconsin since 1989. Published 2026-08-01.
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