Sizing & cost guide

Casement Window Sizes & Costs (2026 Chart)

Q: How much does a casement window cost installed?

A standard-size casement runs roughly $650 to $1,100 installed for vinyl, and more for fiberglass or wood. Larger sizes, custom dimensions, and premium glass push it higher.

Q: Do casement windows come in standard sizes?

Yes. Manufacturers offer standard widths and heights that cost less than custom orders. If your opening matches a standard size, you save both on the unit and on installation labor.

By Sunny Park, Founder & EditorUpdated July 28, 2026

Sunny Park founded WindowQuoteGuide and researches replacement-window pricing across U.S. markets, turning contractor quotes and public cost data into plain-English guides homeowners can actually use.

Quick answer: Standard casement windows range from about 1'2" to 2'11" wide and 2'5" to 6'5" tall. A single standard-size casement runs roughly $650–$1,100 installed for vinyl. Widths are capped because the sash swings out on a hinge — go wider and you move to a two-sash configuration.

Why casement widths are limited

Unlike a double-hung that slides up and down, a casement swings outward like a door. That hinge is the constraint: a very wide single sash would sag, catch wind like a sail, and strain the crank hardware. So manufacturers keep single casements under roughly three feet wide. Need a wider opening? You combine two or more sashes in one frame — which changes the price.

A casement isn't sized like a slider. It's sized like a door that has to hold itself open in the wind.

Standard casement size chart

These are common standard sizes offered by major manufacturers. Exact call-out numbers vary by brand, but the ranges below cover most replacement situations (source: manufacturer size catalogs, 2026).

Size class	Width	Height	Typical use
Narrow single	1'2" – 1'9"	2'5" – 4'0"	Bathrooms, tight walls
Standard single	2'0" – 2'5"	3'0" – 5'0"	Bedrooms, living rooms
Wide single	2'6" – 2'11"	4'0" – 6'0"	Main rooms, egress
Double (2-sash)	4'0" – 6'0"	up to 6'5"	Picture-window openings

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What each size costs installed

Price scales with size, material, and glass. A narrow bathroom casement in vinyl sits at the low end; a wide fiberglass egress casement with triple-pane glass sits well above it. The figures below are installed ranges for 2026, covering the unit plus standard labor.

Narrow / standard single (vinyl)

$650–$1,100

Wide or fiberglass single

$1,000–$1,800

Double (2-sash) unit

$1,600–$3,200

The money-saving rule: match a standard size

🟢 You save when

Your opening matches a standard size. You pay catalog price and installers work faster — no custom fabrication, no oddball trim.

🔴 It costs more when

You need a custom width or height. Custom casements can add 15–30% over the nearest standard size, plus longer lead times.

If your existing opening is close to a standard size, a good installer can often adjust the frame slightly to hit it — saving you the custom premium. For how casement pricing compares to the other popular option, see casement vs. double-hung: which costs less? and the broader 2026 city-by-city cost data.

Frequently asked questions

What is the most common casement window size?

A single casement around 2 feet wide by 4 feet tall is one of the most common. Widths are limited because the sash swings out on a hinge, so most singles top out near 2'11" wide.

How much does a casement window cost installed?

A standard-size casement runs roughly $650–$1,100 installed for vinyl, and more for fiberglass or wood. Larger sizes, custom dimensions, and premium glass push it higher.

Do casement windows come in standard sizes?

Yes. Standard widths and heights cost less than custom orders. If your opening matches a standard size, you save on both the unit and the installation labor.

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Cost figures in this guide are compiled from publicly available 2026 U.S. pricing data — including ENERGY STAR, the U.S. Department of Energy, and national contractor cost guides (HomeAdvisor / Angi True Cost) — and are intended for planning only. Prices vary by region, brand, and installation method; always collect 2–3 local quotes.

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