Casement Window Cost in 2026: Double-Hung Comparisons, Ventilation, and Egress Hardware

Start with a replacement range, then identify the window

Fixr's casement guide, updated January 30, 2026, reports $400–$1,200 per replacement window, with a broader possible range of $200–$2,400. It describes a cost-guide category whose price changes with size, frame material, and glass options. It is not a price list for an exact Pella or Andersen model.

Angi's casement guide, updated August 1, 2026, reports a $815 average and a $150–$2,300 overall range in its opening paragraph. Its separate Cost Insights box instead gives $260–$950. I have kept that inconsistency visible rather than turn the figures into one supposedly precise installed estimate. Its vinyl-material row is explicitly $200–$780 for material only, and its labor section separately gives $100–$300 per window. Those rows do not describe a matched product and installation at your home.

The quoted object matters as much as the range. Ask for the operating sash count: one opening sash, two opening sashes, or an assembly with a fixed center and casement flankers. Have the bidder identify the complete assembly and each operating unit. Do not compare the total for a combined opening with a guide's per-window figure without knowing what its unit represents.

For material questions, the vinyl replacement-window cost guide compares named vinyl lines and warranty terms. For the entire job, the window replacement cost guide covers a wider set of frame materials and installation scopes. This page concentrates on what changes when the window opens on side hinges instead of sliding vertically.

Casement versus double-hung: what the price data can actually say

Angi's general window guide puts casements at $150–$1,000 and double-hung windows at $150–$650 in its style table. These are publisher category rows, not matched installed alternatives. They do not hold size, material, glass, installation method, and local labor constant. Their overlap is more useful than a subtraction of their upper endpoints.

Source: Angi, Window Replacement Cost, style table, retrieved September 30, 2026. Its general table and dedicated casement guide have different upper limits; neither establishes a universal surcharge for changing operation.

Request matched installed alternatives on the same opening schedule. Give the bidder the same dimensions, frame material, desired finish, glass requirements, removal scope, and finish-restoration scope. Ask for a casement option and a double-hung option that each meet the project's requirements. Then compare their actual totals and identify anything that had to change.

If the casement alternative needs a different assembly or hardware option, request that explanation beside the price. The useful comparison is the complete acceptable alternative, not a base unit that cannot do the required job. Similarly, a cheaper double-hung alternative is not an equivalent purchase if it leaves an escape-opening question unresolved.

Keep the national category table as background. It supports asking how operation affects the bid, but it cannot tell you which bidder is fairly priced or what a specific upgrade should cost. This research did not obtain current, binding quotes for the same opening in both styles, so it does not assign a percentage premium.

A manufacturer comparison of the opening you can actually use

Pella's 250 Series casement PDF and 250 Series double-hung PDF publish frame dimensions and clear-opening dimensions separately. For the 3-0/4-0 reference size, both frames are 35-1/2 inches wide by 47-1/2 inches high. Their available clear openings differ substantially.

Source: Pella casement PDF, CM-13, double-hung PDF, DH-15, and Portland's residential-window requirements, all retrieved September 30, 2026. The dimensional comparison is my reading of those documents. It is not an approval for a particular installed bedroom window; sill height, operation, access, and applicable local provisions remain to be checked.

This is a comparison of clear opening, not an assumption about how much air moves through the room. The casement's published opening is taller but narrower. The double-hung's published opening is wider but shorter. The area alone does not capture that shape difference, which is why a code check needs all the listed dimensions.

It is also a comparison of named reference units, not a promise that every casement beats every double-hung. The double-hung document contains other sizes and sash arrangements. Ask the installer for the row matching the proposed unit. Keep equal-sash, unequal-sash, fixed, and combined-unit sections distinct when finding that row.

For the cost decision, the finding creates a useful alternative to investigate. Ask whether a compliant operating configuration can be supplied in the existing opening, and have it priced alongside any proposal to alter the wall opening. The table does not establish that either route is possible at your house or that one is cheaper. It identifies a technical question that can be settled before ordering.

The egress footnote that changes the hardware order

The smaller 2-8/4-0 casement row in Pella's CM-13 table illustrates why an egress mark is not enough on its own. It lists a 31-1/2 by 47-1/2-inch frame, a standard clear-opening width of 19-7/8 inches, and a published clear-opening area of 5.8 square feet. Its mark is E2, rather than E.

The footnote says E2 meets the listed egress dimensions with optional side-pivot hardware. That qualification is the important extraction. The area exceeds the ordinary area minimum, but the displayed width is below the stated width minimum. A quote using this row needs the required hardware identified; the base dimensions and an egress headline are not enough.

Ask the seller to specify clear opening and hardware together. Request the exact manufacturer size code, the hardware configuration, and the clear opening associated with the ordered configuration. If an option is needed to obtain the required opening, have its inclusion stated on the quote and order. This page does not assign an unsourced hardware surcharge.

The manual supplies no optional-hardware dimensions in that displayed base row, so I have not invented replacement width or area figures. The bidder should provide confirmation for the configuration actually supplied. A specification that says only “egress casement” leaves the crucial question unanswered.

During review, follow the footnote all the way to its definition. Check whether it applies to standard hardware, optional hardware, or a grade-floor area threshold. Preserve that reference with the bid. If a seller gives you only a cropped table row, ask for the full page including the notes; otherwise the condition attached to the claimed opening may disappear.

Opening limits and releasable controls are different options

The Pella casement PDF's CM-16 hardware section lists optional limited-opening hardware with a nominal 3-inch opening. It separately lists a factory-applied window opening control device that permits an opening of less than 4 inches during normal operation, with a release mechanism allowing the sash to open completely. Those are separate descriptions; neither should be assumed to be the side-pivot option discussed above.

Ask the seller which device, if any, is on the order and how it operates. Have the company demonstrate the release and provide the applicable instructions. If the window is intended to serve an escape opening, ask how the selected device and its release are addressed in the required opening documentation. Portland's R310 guidance describes the required dimensions as obtained through normal operation from inside; the final installation needs to be evaluated on that basis.

Avoid substituting one hardware term for another on the quote. A restriction intended to limit opening, a release device, and a hinge arrangement that changes available clearance answer different questions. Request their exact descriptions and any relevant manufacturer confirmation. Do not assume that an optional hardware item automatically resolves every safety or egress requirement.

For the price comparison, ask whether those items are included in the proposed configuration or offered separately. Their cost was not published in the fetched technical document. A bidder can supply that local price without this page guessing an amount. Keep the selected device, its instructions, and any approved changes with the final opening schedule.

Portland's emergency opening rules, with their boundaries

Portland, Oregon's residential-window page requires an ordinary fully open escape window to provide at least 5.7 square feet of opening, at least 20 inches of width, and at least 24 inches of height. It describes a five-square-foot allowance for qualifying grade-floor windows and specified basement-well conditions. The bottom of the clear opening generally cannot exceed 44 inches above the finished floor; the city describes separate treatment for some existing conditions.

Portland's dedicated escape-and-rescue page, referencing Oregon Residential Specialty Code R310, adds the operational point: required net clear dimensions are obtained by normal operation from inside. It also addresses below-grade window wells under R310.2.3. Read the applicable local guidance with the installer or permitting department before treating a catalog size as compliant.

The width and height minima must be met alongside the area minimum. Using Portland's stated minimum dimensions, 20 × 24 ÷ 144 = about 3.33 square feet. That is arithmetic from the published minima, not another code threshold. It explains why meeting the width and height separately does not automatically produce enough area.

This distinction is especially helpful when comparing quotes. Ask each bidder to document the opening resulting from normal operation, rather than the outer frame or visible glass. Ask how any opening-control hardware is handled in that documentation. Then ask the jurisdiction which existing-condition or replacement provisions apply to the actual room and project.

Portland's residential page also lists no permit for replacement with no change to header size or location and no reduction of clear opening size. That wording is more specific than “same-size window.” Ask a Portland bidder how a proposed change of operation affects the clear opening. For a different address, use that jurisdiction's requirements.

Do not turn these rules into an assumed excavation or permit allowance. If the job requires a new or enlarged basement opening, window well, or structural work, ask for that scope separately. The egress window cost guide addresses the broader project category. A casement unit price alone cannot describe all of that work.

Ventilation: distinguish opening shape from an airflow promise

Pella's window-type explanation describes casements as side-hinged, crank-operated windows and says they offer more ventilation than double-hung windows. It also warns that their outward swing may be unsuitable beside heavily used decks or porches. Its explanation of double-hung operation has the top and bottom sash moving vertically past each other.

Use that operation difference to inspect the room and exterior space. Ask which way the proposed casement will swing and whether you can reach its controls comfortably. Check the screen location, nearby blinds, countertop, and exterior circulation route in the actual proposed arrangement. Those are fit questions to resolve with a sample or drawing before the order becomes fixed.

The Pella casement manual's CM-16 description places the insect screen on the interior and describes a fold-down crank on the sill. The double-hung manual's DH-29 description places its screen on the exterior and identifies both sashes as operable for ventilation. Request the selected screen and hardware options on the proposal, rather than assume a showroom arrangement is included.

The outward swing clearance question is practical, not a cost percentage. A proposed sash that conflicts with a walking route may need a different arrangement; have the seller show and price that arrangement. Do not assume that relocating a window, splitting an assembly, or choosing another operation has a predictable national surcharge.

Neither the manufacturer explanation nor the clear-opening table gives a measured airflow result for your room. I have not converted opening area into air changes, cooling capacity, or a percentage ventilation improvement. Ask for the basis if a seller makes such a claim. A usable opening is a specification you can check; airflow through a particular room needs more information.

Closed-window performance is a different comparison

Pella's window-type explanation says casements typically have less air leakage than other window styles. That is a general manufacturer statement about operation, rather than a tested leakage value for the reference configurations below. Ask for configuration-specific data when comparing a quantified airtightness claim.

Pella's technical PDFs let us compare a different measure: whole-unit thermal and solar ratings. These rows use Advanced Low-E dual-pane glass, argon fill, and no grilles. They are manufacturer reference configurations; the comparison does not mean the quoted size has automatically been assigned the displayed rating.

Sources: Pella casement PDF, CM-4, and Pella double-hung PDF, DH-4, retrieved September 30, 2026. These are total-unit glazing-performance rows, not air-leakage or utility-bill measurements. They should also be kept separate from the size-specific egress rows above.

The table shows a tradeoff rather than a universal winner. The listed casement has lower U-factor and solar gain, while the listed double-hung has higher visible-light transmittance. Ask which configuration addresses your project's requirements and what its installed price is. The measured rating and the price should refer to the same proposed window.

For the Northern ENERGY STAR prescriptive path, EPA's final Version 7.0 specification sets a U-factor ceiling of 0.22, with its accompanying SHGC criterion. Neither reference U-factor in this table clears that prescriptive ceiling. Other configurations and the specification's Northern equivalent-performance route must be checked separately; this is not a verdict on the entire product line or a statement of local building-code compliance.

Keep performance upgrades reviewable. Ask for the configuration-specific label or manufacturer confirmation, then an alternative price with the same installation scope. There is no savings or payback promise here, because this research did not model the home, energy prices, or the actual replacement conditions.

Compare the complete installation, including a change of operation

Have the bidder describe the existing opening and the proposed installation method. Request the frame type, removal steps, perimeter preparation, sealing or flashing work, interior finish, exterior finish, and disposal. If a proposal changes a double-hung opening to casement operation, ask what else changes beyond the operating mechanism.

For a combined assembly, request a drawing with the fixed and operating sections labeled. State which side each sash is hinged on, which controls are included, and which unit is intended to provide an escape opening if one is required. Keep the manufacturer's combined-unit documentation with the quote rather than apply an individual-unit row to the entire assembly.

Ask the company to make the drawing understandable from both sides of the wall. Mark the interior view and exterior view, identify the room, and show the location of each control. That avoids relying on an ambiguous “left” or “right” description when reviewing an order. If several similar windows are being replaced, give each opening a location name that carries through the measurement sheet, product schedule, and installation paperwork. The point is to make the selected configuration traceable to its actual opening, especially where an egress requirement applies to a particular room.

Address concealed conditions before work starts. Ask how the crew will document damage discovered during removal, who authorizes repairs, and how the revised price will be agreed. Do not accept a guessed national repair allowance as an explanation of your particular opening. A written procedure is more useful than a number with no inspection behind it.

Separate the product warranty from the installer's work and service promises. Request each applicable document and the contact responsible for a later problem. If a bid describes “lifetime coverage,” ask which components, labor, and surrounding finishes that phrase covers. This page does not infer the answer from the operation style.

When the window arrives, ask for the product identification and hardware confirmation before the work is finished. Retain the final opening schedule, approved substitutions, change orders, and completion paperwork together. If the delivered unit differs from the specified alternative, request an explanation before accepting it. These records make the original cost and specification comparison usable after the sales appointment.

What we could not verify

• DOE, "Window Types and Technologies". The URL returned 404 with both plain and browser-user-agent requests; web fetch also failed. A same-site search found no reachable moved page. The closed-window discussion instead uses Pella's reachable explanation and makes no DOE attribution.

Questions to ask before you compare quotes

• Is this one operating casement or a larger assembly?
• Are the casement and double-hung alternatives priced for the same scope?
• What is the actual clear opening with the specified hardware?
• Does the outward swing conflict with a walkway or deck?

Sources

All reachable sources retrieved 2026-09-30. The unreachable DOE source was attempted on the same date.

1. Fixr, "How Much Do Casement Windows Cost? [2026 Data]"
2. Angi, "How Much Does Casement Window Replacement Cost? [2026 Data]" (retrieved through web fetch)
3. Angi, "Window Replacement Cost [2026 Data]" (retrieved through web fetch)
4. Pella, "2026 Architectural Design Manual: 250 Series Casement" (primary-document extraction)
5. Pella, "2026 Architectural Design Manual: 250 Series Double-Hung" (primary-document extraction)
6. City of Portland, Oregon, "Adding Windows or Replacing Windows" (primary-document extraction)
7. City of Portland, Oregon, "Emergency Escape and Rescue Openings" (primary-document extraction)
8. Pella, "Windows 101: Tips for Selecting New Windows for Your Home"
9. U.S. Department of Energy, "Window Types and Technologies" (unreachable: plain and browser-user-agent requests returned 404; web fetch failed; same-site search found no reachable replacement)
10. U.S. EPA, "ENERGY STAR Residential Windows, Doors, and Skylights: Final Version 7.0 Specification" (primary-document extraction)