Can a basement bedroom fail inspection even when the window itself is perfectly legal? In Lincoln, it happens all the time, and the well outside the window is almost always the reason.
Window well size requirements are a separate set of numbers from the window opening’s own dimensions, and most homeowners never learn that until a permit reviewer or a buyer’s inspector points it out. The window can meet every IRC number on the books. If the well around it is too small, the room still isn’t a legal bedroom.
This guide covers the well side only: how big a window well has to be, what happens when it comes up short, and what it typically costs to fix. For the window opening’s own dimensions, our egress window minimum size requirements post covers that ground in full. Read it first if you haven’t measured the window itself yet, since this article assumes the window already passes.
If you already suspect your well is too small, call Lincoln Egress Windows at (402) 261-0485 or reach out through our contact page for a straight answer before a buyer’s inspector finds the problem for you.
Window Size vs. Window Well Size Requirements: Two Different Rules
The International Residential Code treats the window opening and the well around it as two separate items in the same code section, each checked on its own. Lincoln and Lancaster County enforce both.
For contrast, here’s what the window itself needs: a net clear opening of at least 5.7 square feet, a minimum clear height of 24 inches, a minimum clear width of 20 inches, and a sill no higher than 44 inches above the finished floor. Those numbers are about the opening you climb through.
Window well size requirements are about something different: the space you land in before you can climb out at all. A window can hit every one of those four numbers and still be sitting in a well that’s too narrow, too shallow, or too close to the foundation to count as a legal exit path.
That’s the gap that catches people off guard. Nobody assumes their window is fine and their well isn’t, because most people think of the two as one unit. Code doesn’t see it that way.
Window Well Size Requirements: The Numbers That Actually Apply
A window well serving an egress window needs at least 9 square feet of clear horizontal area. That’s the floor space inside the well, not the size of the cover on top or the depth of the pit.
Two more numbers narrow that further. The well needs a minimum horizontal projection of 36 inches out from the foundation wall, and a minimum width of 36 inches. Both dimensions have to clear 36 inches at the same time, just like the window’s own height and width have to clear their minimums together.
A well can hit 9 square feet on paper and still fail if it’s shaped wrong. A long, narrow well that’s 60 inches wide but only 20 inches deep front to back has plenty of area but fails the 36 inch projection rule outright. The math and the shape both have to work.
| Requirement | The Window Opening | The Window Well |
|---|---|---|
| Minimum clear area | 5.7 sq ft net clear | 9 sq ft clear area |
| Minimum width | 20 in clear width | 36 in width |
| Projection from foundation | Not applicable | 36 in minimum |
| Height or depth rule | 44 in maximum sill height | Deeper than 44 in needs a ladder or steps |
| What it measures | The opening you climb through | The space you climb into first |
Once you see the two side by side, the pattern is clear. The window rules cap the sill and set a floor for width and height. The well rules set a floor for area, width, and projection, with a separate depth trigger for a ladder. They’re checked on different tape measure marks, and neither one substitutes for the other.
Why a Code-Legal Window Can Still Sit in an Illegal Well
This is where a lot of Lincoln-area homes get tripped up, especially older ones where a well was dug decades ago for a much smaller basement window.
Picture a homeowner in Crete getting ready to list a 1970s ranch. The basement bedroom window was swapped for a code-size casement years ago, and it passes every window number without a problem. The well outside it, though, is the original one from when the house was built, projecting only 28 inches from the foundation and 30 inches wide. It comes up short on both well numbers even though the window above it is fine.
The same pattern shows up during new installs. An owner in Ashland finishing a basement ordered a correctly sized egress window and had it installed in a new cut-in. The excavation crew dug a well that looked roomy enough by eye, but at inspection it measured just under 34 inches of projection, a couple of inches short of the 36 inch minimum. The window passed, but the well didn’t, and the crew had to come back and widen the excavation before the final sign-off.
Both of these scenarios end the same way at a closing table or a permit desk: a note that says the bedroom isn’t legal, not because of the window, but because of the hole in the ground next to it. That distinction matters for negotiating a fix, and it matters for the price, since enlarging a well costs far less than replacing a window that already works.
Fixing an Undersized Window Well
Once you know the well is the problem and not the window, the fix is usually simpler than people expect. In most cases, you don’t need a new window at all. Just a properly sized hole around the one you already have.
A standard window well replacement, sized correctly to at least 9 square feet with 36 inches of width and projection, typically runs $600 to $1,500. That’s the range for swapping out an undersized well for a properly sized one around an existing, already-compliant window.
Then there’s a homeowner in Seward, getting ready for a rental license inspection. The window in the basement unit was fine, but the well was a narrow steel liner from the 1980s that failed the projection rule by several inches. Replacing it with a properly sized well ran $950, well inside the standard range, and the unit passed on the follow-up visit.
Costs move higher only when the well problem forces changes to the foundation opening itself, not just the excavation around it. If enlarging the well also means moving or resizing the window opening in the wall, that becomes a cut-in job, typically $3,500 to $7,000, or up to $9,500 with full interior finishing. Our window well installation service page covers what a straight well replacement involves. Our egress window installation page covers the larger cut-in scenario, for when the opening itself needs to change too. For a closer look at what drives the price either way, our window well installation cost guide breaks down the variables in more detail.
Not sure which situation applies to your well? Call (402) 261-0485 and we’ll tell you plainly whether this is a well swap or a bigger job before you commit to either one.
Ladders, Steps, and the Well’s Clear Opening
Window well size requirements don’t stop at square footage. Depth brings in a second rule that trips up homeowners who solve one problem and accidentally create another.
Any well deeper than 44 inches, measured from the well floor to the ground surface outside it, needs a permanently affixed ladder or built-in steps. That’s a separate trigger from the 9 square foot area rule, and a well can pass on size while still needing a ladder because of its depth.
Here’s the part that trips up DIYers: the ladder or steps can’t obstruct the well’s required clear opening. A ladder mounted where it eats into the 36 inch width, or blocks the window from swinging fully open, fails inspection even if the well’s raw dimensions are correct on paper. The ladder has to fit inside the well’s footprint without shrinking the usable escape space below the minimums.
This is exactly why enlarging a well sometimes means going a little bigger than the bare 9 square foot minimum, especially if the well is also deep enough to need a ladder. A well built right at the minimum with no room to spare for a ladder usually needs a second round of work later. Our window well ladder requirements post covers the ladder specifics, including rung spacing and attachment rules, in full.
Confirming the Exact Number With Lincoln and Lancaster County
Every number in this article comes from the IRC, which Lincoln and Lancaster County both administer and inspect locally. That’s good news for consistency, since the same well dimensions apply whether the house is in Lincoln proper or one of the surrounding towns like Waverly, Hickman, or Beatrice.
It’s still worth confirming the exact requirement on your specific permit before digging starts. Local building departments occasionally apply additional review on soil conditions, drainage, or setback from a property line that can affect where a well can sit even when its size is correct. The City of Lincoln administers permits and inspections for building and safety matters, and a quick call before you start avoids a surprise at final inspection. A Lincoln building permit for well or egress work typically runs $75 to $200, which is nothing next to the cost of redoing an excavation.
If you’d rather skip the back and forth and just get a number you can trust, contact us or call (402) 261-0485. We measure the well against the actual code minimums before we quote, so you’re not guessing whether 34 inches is close enough.
Frequently Asked Questions
What is the minimum size for a window well in Nebraska?
A window well serving an egress window needs at least 9 square feet of clear horizontal area, with a minimum width of 36 inches and a minimum horizontal projection of 36 inches out from the foundation. All three numbers have to be met at the same time. This is separate from the window opening’s own size requirements.
Can my window well be too small even if my egress window is the right size?
Yes, and it’s one of the most common reasons a basement bedroom fails inspection. The window opening and the well around it are measured against completely different numbers, so a code-compliant window can still sit in a well that falls short on area, width, or projection.
How much does it cost to fix an undersized window well?
A standard well replacement around an existing, already-compliant window typically runs $600 to $1,500. Costs rise to $3,500 to $7,000, or up to $9,500 with finishing, only if the foundation opening itself also needs to be enlarged or moved, not just the well around it.
Do I need a ladder if I enlarge my window well?
Only if the finished well is deeper than 44 inches from the well floor to the ground surface, in which case a permanently affixed ladder or steps is required. The ladder or steps must fit inside the well without blocking the required clear width or interfering with the window’s full swing. Lincoln and Lancaster County confirm the exact depth trigger on the permit.