Why Casements Win for Egress
A casement window is hinged on one side and cranks open like a door. When it is open, nearly the entire frame is clear space — nothing slides across the opening, nothing blocks the middle. That is why casements are the go-to for egress: they deliver the most clear opening per inch of window. In a modest foundation opening, a casement is often the only style that hits the 5.7-square-foot minimum without enlarging the hole.
They are also the easiest to open in a panic. One crank, one motion, and the window swings wide. No lifting a heavy sash, no figuring out which panel slides. A kid or an older adult can work a casement crank. In an emergency, simple wins.
Where Casements Fit Best
Casements shine in the tall, narrow openings common in Baltimore basements — the classic foundation window slot. A 32-by-48-inch casement, for example, cranks to a clear opening that comfortably beats the minimums. They are our most common pick for replacements, because they make code in existing openings that sliders cannot.
One thing to plan for: the sash swings out into the window well. The well needs to be deep enough — front to back — to let the sash open fully without hitting the well wall. We size the well projection with the swing in mind, which is one more reason the well and window should be planned together.
What to Know Before You Choose
Casement hardware is mechanical — cranks and hinges — so it needs occasional attention. A shot of lubricant on the crank mechanism once a year keeps it smooth for decades. Screens sit on the inside of a casement, which means popping the screen out is part of the escape path; we show you how during the walkthrough so it is second nature. And because the whole sash swings out, keep the well clear of stored items — a well full of paint cans is a well you cannot climb out of.
Casement vs. Slider: The Quick Compare
Pick casement when the opening is modest and you need maximum clear area, or when ease of opening matters most — kids' rooms, in-law suites. Pick slider when the opening is wide and short, or when you want no moving parts swinging into the well. We will measure your opening and recommend the style that meets code cleanly. Either way, the window we set opens from the inside with no tools and no keys — that part is code, not preference.
Sizing a Casement to Your Opening
Here is how the sizing math works. A casement's clear opening is nearly the full frame — the sash swings completely out of the way. So a window with a 32-inch by 48-inch frame gives you roughly 30 by 46 inches of clear space once you subtract the frame itself. That is about 9.6 square feet — comfortably over the 5.7 minimum, with 30 inches of width and 46 of height beating the 20-by-24 minimums easily.
Smaller works too. A 28-by-44-inch casement yields around 26 by 42 clear — about 7.6 square feet. Even a 24-by-40 gives roughly 22 by 38, or 5.8 square feet — just over the line. That is the casement advantage: modest windows that still comply. We run these numbers on your exact opening during the free visit and show you the smallest window that meets code — because the smallest compliant window is usually the most affordable one that does the job.
Height matters as much as area. The sill must sit at 44 inches or lower above the floor. In deep basements, that means the window goes low in the wall and the well goes deep outside — with the ladder the code requires past 44 inches. We plan the window and the well as one system, not two separate purchases.
Living With a Casement
Day to day, a casement is the easiest basement window to live with. The crank opens it wide for ventilation — basements get musty, and a casement moves air better than any slider. The seal is a compression seal, like a refrigerator door, which keeps drafts and dust out better than sliding tracks.
The maintenance is light but real. Once a year, shoot silicone lubricant into the crank mechanism and wipe the hinges. Check that the sash still swings fully — houses settle, and a sash that rubs is a sash telling you something moved. Keep the well clear so the sash opens into empty space, not a pile of stored boxes. Five minutes a year keeps a casement working for decades.
How It Works: Our Process
Step 1 — Free visit and measure. We measure the existing opening (or the planned one), check the wall type, and run the casement sizing math with you — showing the smallest window that meets code.
Step 2 — Written estimate. Window, reframing if needed, well, ladder, drainage, and cover — itemized, no surprises.
Step 3 — Set day. Old unit out (or opening cut), new casement framed, leveled, flashed, and sealed. The crank gets tested a dozen times before we call it done.
Step 4 — Well and walkthrough. We confirm the sash swings fully into a clear well, verify the clear opening beats the minimums, and show you the crank, the screen release, and the cover lift.
Call (301) 679-9193 or send the form below for your free written estimate.