Types of Casement Windows: Single, Double, French and More

Casement windows are hinged windows that crank open like a door, and there are 7 common types: single, double, French, triple, fixed, push-out and in-swing. All but the fixed one hinge at the side and swing open like a door. A single has one sash, a double pairs two with a post between them, a French pair has no post, and a triple sets a fixed pane between two casements. ProVia makes crank-out singles, doubles and triples, plus a fixed casement.

We install casement windows in homes from St. Louis County to St. Charles County. Our casement and awning page has ProVia’s colors and glass.

The Types at a Glance

Diagram of six casement window types seen from outside: single, double with a post, French with no post, triple with a fixed center, wide center, and fixed — Diagram drawn for this page, seen from outside. The dashed lines meet on the hinge side, as American window plans mark it.

Type	How it opens	ProVia lists it?
Single	one sash cranks out	yes
Double	two sashes, post between	yes
French	two sashes, no post	not listed
Triple	two sashes, fixed center	yes
Fixed	does not open	yes
Push-out	push the sash, no crank	not listed
In-swing	opens into the room	not listed

ProVia column from ProVia’s casement and awning page, read September 2026.

Single Casement

A white casement window over a kitchen sink, with a view of a field outside — A single casement over a kitchen sink, where a crank is easier to reach than a sash to lift.

A single casement is one sash in one frame, hinged on the left or the right. ProVia builds it both ways and calls them 1-Lite Left and 1-Lite Right. Marvin names the hinge side as seen from outside. Andersen names its casement hardware as seen from inside, so check which view your quote uses before you sign.

You open it with a crank that folds flat when you are done, so it stays clear of blinds and curtains. ProVia suggests casements over sinks and counters for that reason: turning a crank is easier than pushing up a sash you have to lean over. It also says a casement suits an opening whose height is more than double its width.

Double and French Casements

A double casement is two sashes side by side in one frame, with a post between them. ProVia makes it as a 2-Lite, split half and half. Each sash opens on its own, so you can air a room with one and leave the other shut.

A French casement is also a pair, but with no post. When both sashes swing open, the whole width is clear, like a pair of French doors. Andersen sells this type as a push-out casement. ProVia’s casement page does not list one, so if the no-post look matters to you, say so early.

Triple Casements

Tall casement windows with wood interior frames on either side of a large fixed pane, looking out to a deck — Casements either side of a large fixed pane, the layout ProVia sells as a 3-Lite.

A triple puts two casements either side of a fixed pane that does not open. ProVia makes it with equal thirds, or with a wide center that takes half the width and a casement on each quarter. The wide center is the same idea as a picture window with casement flankers. Our picture window guide covers the fixed pane itself.

Fixed Casements

A fixed casement has the same frame and sash lines as an opening one, but it never opens. You use it beside working casements so a row of windows matches, or where you want light and no air. ProVia lists it as its own casement configuration. ProVia’s 2024 ENERGY STAR Most Efficient sheet rates its Endure fixed casement at 0.13 in U-factor, where lower means less heat lost. The Endure casement that opens rates 0.15 with the same ComforTech TLK glass.

Push-Out and In-Swing Casements

A push-out casement has no crank. You turn a handle and push the sash open by hand, and a stay holds it. Pella and Andersen both sell one. An in-swing casement opens into the room instead of out, which helps when a shrub or a porch railing sits right outside.

Neither appears on ProVia’s casement page, where every opening casement cranks out. If you want one of these, you are choosing a different maker.

Awning Windows: A Casement on Its Side

An awning window is built the same way as a casement, but hinged at the top so the bottom swings out. ProVia describes it as a casement set on its side. Because the sash tilts out over the opening, it sheds rain while it is open. It suits openings wider than they are tall, the opposite of a casement. The same ProVia sheet rates the Endure awning at 0.15 in U-factor, level with the Endure casement. Our awning window guide goes through it in full.

Which Type for Which Room

Three casement windows with patterned privacy glass above a bathtub — Casements with patterned privacy glass above a tub.

When I measure an opening for a casement, I look first at what sits outside it, because an out-swinging sash needs room to open.

Kitchen, over the sink: a single casement, so you crank it instead of leaning over to lift a sash.
Bedroom: a casement sized for escape, which the code calls egress. The International Residential Code, section R310, asks for a clear opening of at least 5.7 square feet. It must be at least 24 inches high and 20 inches wide, with a sill no higher than 44 inches above the floor. A casement opens its full width, so it meets that in a smaller frame than most types. Local code decides, so confirm it before you order.
Living room with a view: a triple with a wide center, for glass in the middle and air at the sides.
Bathroom: a single or double casement with privacy glass, which ProVia offers on its casements.
Next to a deck, walkway or patio: a casement is not for a wall where the open sash would swing into the path, and you cannot crank it past a railing. An awning or a sliding window may suit that wall better.

Downsides to Know

The sash sticks out: open, it can catch a passerby, a mower or a gutter downspout.
Wind can catch it: crank it shut before a St. Louis spring thunderstorm arrives, not after the gust.
Moving parts: the crank, the operator arm and the hinges wear. ProVia’s window care page says to oil the hinges lightly as needed, tighten loose hinge screws and keep the weatherstrip clean of grit so it seals. The warranty printed in ProVia’s Aeris, Endure and Aspect brochures covers moving parts such as locking mechanisms for as long as the original buyer owns and lives in the home.
No window air conditioner: a sash that swings out will not hold one.

Casement or Double Hung?

A casement seals tighter. When you close it, the sash presses into the frame, which is why Andersen calls casements one of the most energy-efficient window types. On ProVia’s 2024 ENERGY STAR sheet, with the same TLK glass, the Endure casement rates 0.15 in U-factor and the Endure double hung 0.17. Aspect shows 0.15 against 0.16, and Aeris ties at 0.17. A casement also opens its whole height to a breeze. A double hung opens only halfway, but it keeps the sash inside the wall line, takes a window air conditioner and suits a traditional house. ProVia’s Endure and Aspect brochures list a full screen on the casement and a half screen on the double hung.

If you are weighing the two, our guide to double hung windows sets out that side.

Aeris, Endure or Aspect?

ProVia builds its casements in three window lines. The frame is the same depth in all three, 3 1/4 inches, with welded corners on the frame and sash. ProVia’s Aeris, Endure and Aspect brochures list a bulb-seal weatherstrip on the casement in each line. The differences are inside:

	Aeris	Endure	Aspect
Inside face	real wood	vinyl	vinyl
Inside colors	25 stains or 19 paints	8	3
Outside colors	4	4	3
Glass options	8	8	6
Glass packages	13	13	13
Foam in the frame	yes	yes	optional

From the brand comparison on ProVia’s casement and awning page, read September 2026. The Aspect foam option is from ProVia’s Aspect brochure.

Aeris is the one to pick for a stained wood look inside the room. Endure and Aspect add ProVia’s INNERGY reinforcement inside the vinyl. Endure and Aeris fill the frame with graphite foam, and ProVia’s Aspect brochure lists that foam as an Aspect option. Colors, glass and grids for all three are on our ProVia casement windows page.

What Moves the Price

We do not print prices, because the same casement changes cost with what you put on it. These move the number:

Opening or fixed: every sash that opens adds hardware.
Size and count: a triple costs more than a single, and a tall sash more than a short one.
The line: Aeris, Endure or Aspect, from the table above. All three lines are ENERGY STAR certified, and ProVia says Endure has the most vinyl color choices.
Glass: one of the 13 glass packages, with privacy or decorative glass on top.
Extras: grids and a hardware finish that is not white.

Common Questions

The common types are single, double, French, triple, fixed, push-out and in-swing. Awning windows are built the same way but hinge at the top.

A French casement is a pair of sashes that open from the middle with no post between them, so the whole width is clear when both are open.

A double casement is two sashes side by side in one frame, with a post between them. Each one opens on its own.

A crank casement opens with a handle you turn. A push-out casement has no crank: you unlatch it and push the sash open by hand, and a stay holds it.

Yes. A casement opens its full width, so it meets the escape rule of 5.7 square feet of clear opening in a smaller frame than most types. Check your city’s code before you order.

The open sash sticks out past the wall, so it can get in the way on a deck or walkway. The crank and hinges also need light oiling and a regular check.

A casement seals tighter and opens its full height to a breeze. A double hung stays inside the wall line and can hold a window air conditioner. The room decides.

Where you want a tight seal and a full-height breeze, and nothing outside blocks the sash, yes. Beside a deck or walkway, an awning or sliding window is often the better fit.

Stand outside and look at it. If the hinges are on the left, it is usually called a left-hand casement. Confirm the view your quote uses before you order.

Picking Yours

Four checks, in this order, settle which casement suits each opening:

First, the shape: taller than twice its width suits a casement. Wider than tall suits an awning or a triple.
Then what sits outside: a path, deck or shrub may rule out an out-swinging sash.
Next, the hinge side: pick the side that keeps the open sash clear of anything outside, and check which view your quote uses.
Finally, the line and glass: Aeris, Endure or Aspect, and one of ProVia’s glass packages.

Search our ZIP code on ProVia’s dealer locator and you will see both of our ProVia credentials: Platinum dealer, and certified installer of its entry doors.

You can see every casement and awning style in ProVia’s window brochures, windows we have installed in our gallery, and the other window types we install on our replacement windows page.

We guarantee our workmanship for 10 years. Call 314-277-5952 or send an estimate request online to book a visit. We come out from our base in Earth City, measure each opening, check what sits outside it, and quote the casement types that suit it.