Updated October 3, 2026. Building-code, lead-safety and product statements below come from the published sources listed at the end of this page, checked on that date. This page does not publish a fair price per window, because we cannot source one. How we research this
Is $3,000 per casement window insane? Not necessarily, and usually not decidable yet. The same figure can be a reasonable price for one house and a poor one for the house next door, and on its own it cannot tell you which. A casement quote divided by the number of windows on the wall blends together things that have nothing to do with each other: two sashes joined into one opening, a made-to-measure size, a tear-out of rotted framing, a fixed picture unit bolted to the side, a permit and a haul-away. Until those are separated, the per-window number is a guess.
We are not going to give you a national fair price for a casement window. No source we trust publishes one that survives contact with an actual opening. What this page gives you instead is the order in which to take a high casement or custom-window quote apart, a checklist that sorts it into one of three outcomes, and a hand-off to the tools that do the arithmetic once the scope is clean.
Why this question: in two recent homeowner discussions we track, people posted casement and custom-window quotes of roughly $3,000 to $3,500 per window and asked whether that was crazy. Those are individual, anecdotal quotes from public forums. We have not seen the paperwork; they are not averages and not a benchmark for your house. They are the reason this page exists, not the answer to it. If you want broad cost ranges, our window replacement cost guide covers them, and why window quotes vary explains the general drivers. This page stays on one narrower question: can this casement quote be judged fairly yet?
Why “per window” breaks down on casement quotes
A casement is hinged on one side and cranks outward, and that design puts practical limits on how big one operating sash can be. Andersen, for example, lists its 100 Series casement in sizes up to 3 feet wide and 6 feet high, with custom sizes in 1/8-inch increments. A wider opening is therefore usually filled with two or more units joined together, often an operating casement beside a fixed picture unit. On the wall it looks like one window. On the order it is two, three or four.
Andersen’s joining details for combination windows show what that means on paper: the overall width is the sum of the individual window widths plus an allowance for each join, and the structural performance of a combination is only as high as its weakest window or join. The Texas Department of Insurance’s evaluation reports for mulled assemblies make the same point from the certification side: each window in a mulled assembly carries its own certification label, and those labels describe the individual windows, not the assembly. So when you count “ten windows” and a contractor prices fourteen units plus the joins between them, both counts can be right, and the per-window figure you get depends entirely on which one you divide by.
Custom sizing adds a second layer. A replacement casement is often built to the existing opening rather than taken from a standard size table. That is normal, but it means two bids can price different things: one made to measure, one the nearest standard size with the gap filled by trim. The word “custom” on a proposal does not tell you which, so ask. Glass works the same way: NFRC ratings describe the whole window, frame and spacer included, for a specific product, so the U-factor and SHGC have to be read per unit type as quoted, not from a brochure. Our guide to reading the NFRC label covers the numbers.
Two code questions that land on casements more often than on other windows
Bedroom egress. The International Residential Code requires an emergency escape and rescue opening in sleeping rooms, with a net clear opening of at least 5.7 square feet (5 square feet at grade floor), at least 24 inches of clear height and 20 inches of clear width, and a sill no more than 44 inches above the floor. Casements are a common way to meet that in a modest opening because the whole sash swings clear. The code also exempts replacement windows from some of those dimensions when the new window is the manufacturer’s largest standard size that fits the existing opening and is the same operating style, or a style with an equal or larger opening. Adoption and amendments are local, and some jurisdictions, such as Tustin, California, require a building permit for any window replacement. If a bid changes a bedroom window’s style or size, it should say how egress is handled.
Safety glass. Under the same code, a window pane needs safety glazing when all four of these are true: the individual pane is larger than 9 square feet, its bottom edge is less than 18 inches above the floor, its top edge is more than 36 inches above the floor, and there is a walking surface within 36 inches horizontally. Glass close to a door can qualify too. Large, low casement-and-picture combinations can trip these rules, which makes tempered or laminated glass on some units a legitimate line item rather than padding. It should be named per unit.
Don’t divide the total by window count until…
Work through these five gates in order for every quote you hold. If any gate comes back “not stated,” stop: you do not yet have a price you can judge.
The gates are deliberately boring. None of them asks whether the contractor is honest or whether the window is good. They only ask whether the quote contains enough information to be priced against anything. Most high-looking casement quotes fail gate one or two, not because something is hidden, but because the proposal was written to sell a job rather than to be audited.
The Casement Quote Fairness Checklist
Each row is one field to find on the proposal. The second column is what the quote has to state before that field stops distorting the per-window figure; if it is missing on any row, the quote as a whole is cannot judge yet. The third column lists the ways that field can legitimately make a casement job expensive. The fourth is what turns a high price into a reason to get another bid. Swipe sideways on a phone to see every column.
| Field | The quote must state | Legitimately pushes the price up when… | Red flag when… |
|---|---|---|---|
| Actual opening dimensions | Measured width and height for every opening, and whether that is the existing frame or the rough opening | Openings are wider or taller than the product line’s standard casement range, so they need a custom unit or several joined units | No sizes at all, or sizes that do not match what you can measure yourself |
| Number of openings vs number of units | Two counts: openings on the house and units on the order, with every joined assembly broken into its parts | Wide openings are filled with joined casements or casement-and-picture combinations, so there are more units than openings | Only a single “number of windows,” or a unit count that changes between versions of the quote with no explanation |
| Casement/picture combinations | Which sashes operate and which are fixed, and the hinge side of each operating sash | More operating sashes than fixed ones; that can be the right call, as long as it is a choice you made | Operating and fixed sashes not identified, so you cannot see what you are paying for |
| Custom and mulled configuration | Whether each unit is made to measure or a standard size, and whether joined units arrive joined from the factory or are joined on site | Out-of-square or non-standard openings in an older house that a standard size cannot fill cleanly | “Custom” applied to every unit with no sizes, or joined assemblies with no joining detail mentioned |
| Frame and material | Manufacturer, product line and frame material for every unit | Wood, clad-wood or fiberglass lines, interior wood finishes, exterior colors | Only “premium vinyl,” “energy-efficient” or a house brand with no product line you can look up |
| Glass and spec | Glass package per unit, NFRC U-factor and SHGC for each window type as quoted, and which units get tempered or laminated glass | Triple pane, laminated or impact glass, or safety glass the code requires on large, low panes | ENERGY STAR or “Low-E” claimed with no NFRC numbers, or no answer on which units are tempered |
| Installation method | Insert or full-frame for every opening, written on the order | Full-frame installation where frames, sills or flashing are failing | Method left blank, or one method on paper and another in conversation |
| Trim and finish work | Interior casing, stool, jamb extensions, exterior trim or capping, paint or stain: each included, excluded or priced | New interior trim on every opening, exterior trim on a full-frame job, finishing done on site | Silence, so the bid looks lower until trim appears as an extra |
| Difficult access | Which openings need tall ladders, scaffolding or a lift, and whether that cost is inside the total | Second- and third-story openings, steep grades, landscaping or decks in the way | An access charge that appears only after signing |
| Structural repair | How rot or framing damage will be priced if found: a fixed allowance or a unit rate, and who approves the work before it starts | Rotted sills, damaged framing or header problems found when the old units come out | Open-ended “as needed” repair language with no rate and no approval step |
| Historic and design constraints | Whether historic-commission or HOA approval is needed, who files it, what the approved design requires; for homes built before 1978, the firm’s EPA lead-safe certification | Matching divided lites, profiles or materials a local historic district requires; lead-safe work practices | A pre-1978 house with no mention of lead-safe certification, or a historic house with no mention of review |
| Permits and disposal | Who pulls the permit, whether the fee is inside the total, and whether removal and haul-away of the old units is included | A jurisdiction that requires a permit and inspection for window replacement | “Permit by owner” on a job that changes opening sizes or bedroom egress, or disposal left out |
| Warranty | The manufacturer’s warranty document for that product line and the installer’s workmanship term, both in writing | Longer or transferable product and labor coverage on some lines | A warranty described in a sentence with no document, or no workmanship term at all |
Size and joining rows rely on Andersen’s published casement sizes and combination-window joining details and on Texas Department of Insurance mulled-window evaluations. Egress and safety-glass references follow International Residential Code sections R310 and R308.4 as published by local building departments. The lead-safety row follows EPA’s Renovation, Repair and Painting rule; the historic row follows local design guidelines such as Littleton, Colorado’s. All are listed under Sources. General quote fields follow what a window quote should include.
Reading the result: three outcomes
1. Cannot judge yet
This is the most common outcome, and it is not an accusation. A quote that says “10 casement windows, installed” with one total cannot be called fair or unfair by anyone, including us. Send it back with the questions at the end of this page and ask for the answers in writing. A contractor who fills in sizes, units, glass and method has usually just made the price easier to defend, and you will know far more about the job than you did.
2. Expensive but plausibly scope-driven
Every gate passes, and the high per-window figure traces to things you can point at: more units than openings, made-to-measure sizes, a wood or clad line, laminated or tempered glass on specific units, full-frame installation, new trim, upper-story access, a priced rot allowance, historic matching. That does not make it the right price for you. It means the price is explained, and the next question is whether you want all of that scope. Some of it may be adjustable: a fixed unit where you only need light, a standard size where trim can absorb the difference, insert installation on openings whose frames are sound. Our insert vs full-frame guide covers when that last one is reasonable.
3. Specific red flags justify another bid
A high price combined with any of the following is a good reason to get at least one more bid on the same scope before you sign:
- No opening sizes, or no unit count separate from the window count.
- No manufacturer and product line for the units.
- No installation method written per opening.
- Open-ended repair language with no rate and no approval step.
- A house built before 1978 and no evidence the firm is certified for lead-safe work, which EPA requires for paid window replacement in pre-1978 homes.
- A warranty described out loud but not provided as a document.
- A price that only holds if you sign the same day.
Notice what is not on that list: the per-window figure itself. A high number with complete paperwork is outcome two. A high number with gaps is outcome one or three, and the gaps decide which.
Once the scope is clean, divide twice
When every gate passes, pull patio doors, permit, disposal and any repair allowance out of the total first; they belong on their own lines. Then divide the window portion twice: once by the number of units and once by the number of openings. The per-unit figure is the one to set against another bid that prices the same units. The per-opening figure tells you what each hole in the wall costs to finish. If two bids are close per unit but far apart per opening, the gap is in installation, trim or repair, not in the windows. For a rough sense of how scope moves a total before quotes arrive, the window replacement cost calculator gives a planning range, not a quote.
If the answer turns out to be “expensive but explained” and the real question has become whether to do the work now or later, the Cost of Waiting tool walks through repair, replace or wait one season on the failure you actually have, without inventing savings.
Eight questions to send back before you sign
- How many units are on this order, and how many openings? Which openings get more than one unit?
- What is the measured size of each opening, and is each unit made to measure or a standard size?
- Which sashes operate and which are fixed, and which side is each operating sash hinged on?
- What manufacturer and product line is each unit, what are the NFRC U-factor and SHGC for each window type as quoted, and which units get tempered or laminated glass?
- Is each opening an insert or a full-frame installation, and which casing, stool, jamb extension, exterior trim and paint work is included?
- If you find rot or framing damage, how is it priced, and who approves that work before it starts?
- Who pulls the permit, is the fee in this total, and how is bedroom egress handled where a window changes style or size? If the house was built before 1978, can you show your EPA lead-safe firm certification?
- Can I have the manufacturer’s warranty document for this product line and your written workmanship warranty before I sign?
A contractor who answers those in writing has given you a casement quote you can actually judge. A contractor who will not has answered the headline question for you. For warranty clauses worth reading closely, see our window warranty decoder.
Sources
- Andersen — 100 Series casement window (sizes up to 3 ft wide and 6 ft high, custom sizes in 1/8-inch increments)
- Andersen — 100 Series combination and joining details, as filed with Detroit’s Historic District Commission (overall width per join, structural performance of combinations)
- Texas Department of Insurance — product evaluation for mulled window assemblies (individual unit labels)
- Linn County, Iowa — IRC Section R310 egress window requirements
- City of Spearfish, South Dakota — 2021 IRC egress windows handout, including replacement windows
- City of Tustin, California — user guide to replacing emergency escape and rescue windows (permit requirement, replacement exemption)
- City of West Point, Georgia — safety glazing tip sheet, IRC R308.4
- Boulder County, Colorado — hazardous locations for glazing, 2021 IRC R308.4
- U.S. EPA — Renovation, Repair and Painting Program: contractors (window replacement in pre-1978 housing)
- City of Littleton, Colorado — guidelines for replacement of historic windows (permit, Certificate of Appropriateness)
- U.S. Department of Energy — energy performance ratings for windows, doors and skylights (NFRC U-factor and SHGC)
This page uses a drawn diagram instead of product photos because it is not about one product. We do not reproduce manufacturer images without written permission.