Standard Window Sizes: The Complete Chart
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Get free quotesHow window-size shorthand actually works
Window sizes are usually written as a 4-digit code, and once you know the trick it's easy to read: the first two digits are the width in feet and inches, and the last two are the height. A "3050" window is 3 feet 0 inches wide by 5 feet 0 inches tall. A "2846" window is 2 feet 8 inches wide by 4 feet 6 inches tall. This shorthand is an industry convention, not a strict standard — it tells you roughly what size window you're looking at, not the exact rough-opening dimension a specific manufacturer will build to.
That's the catch worth knowing before you shop: nominal sizes vary by manufacturer. A "3050" from one brand might be a hair different from another's, and actual manufactured (as-built) sizes typically run about a half-inch smaller than the nominal size to leave room for shims and flashing. None of this matters for a full professional measure-and-install, but it matters if you're comparing spec sheets or trying to guess a price before a contractor visits.
Common sizes by window type
| Window type | Typical width range | Typical height range |
|---|---|---|
| Single/double-hung | 24"–48" | 36"–72" |
| Sliding (2-lite) | 36"–84" | 24"–60" |
| Casement | 18"–36" | 24"–72" |
| Picture (fixed) | 24"–96" | 12"–96" |
| Awning | 20"–48" | 16"–36" |
| Bay/bow (full unit) | 60"–126" | 36"–72" |
| Garden window | 36"–48" | 36"–48" |
Pro tip from our network contractors
Never order replacement windows off a size chart alone. If your home is older than about 40 years, there's a real chance your rough openings don't match any modern nominal size — a professional measure is what actually determines cost and whether your installer needs a custom or made-to-size unit.
Why your window might not match any chart
Homes built before standardized lumber and window sizing became common — roughly pre-1980, though it varies by region — often have openings that are simply whatever size the original builder framed. Additions, older remodels, and custom builds add more variation. If your opening doesn't match a standard size, you're not stuck: installers regularly order made-to-size replacement windows, though custom sizes typically cost more and take longer to arrive than a standard stock size.
For the full measuring process once you know roughly what you're working with, see how to measure a window for replacement.
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Get free quotesFrequently asked questions
What does a window size like "3050" mean?
It's a 4-digit shorthand where the first two digits are the width in feet-inches and the last two are the height. "3050" means 3 feet 0 inches wide by 5 feet 0 inches tall.
Are window sizes standardized across manufacturers?
Not exactly. Nominal sizes are a common industry shorthand, but actual manufactured dimensions vary slightly by brand, and as-built sizes typically run a bit smaller than the nominal size to allow for shims and flashing.
What's the most common window size for a house?
For single- and double-hung windows, widths of 24"–36" and heights of 36"–60" are the most common range in U.S. homes, but this varies significantly by room and window type.
What if my window opening doesn't match a standard size?
It's common in older homes. Installers can order a made-to-size (custom) replacement window — it typically costs more and takes longer to arrive than a standard stock size, but it's routine work.
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