Window Replacement Cost Calculator

Price a whole-house window job: this window replacement cost calculator prices each opening by type, frame, glass and install method, insert against full frame.

By CalcBuilt Editorial TeamUpdated September 9, 2026Formulas checked against manufacturer specs, see how we calculate.

Quick answer: To budget replacement windows, take a per-opening price for the type, multiply by the frame, glass and size, then apply the install method. Ten standard double hung vinyl windows with low-E argon glass, set as pocket inserts, typically run $5,830 to $12,720. That is $583 to $1,272 per window.

Your measurements

One wall: area is wall length times height, minus each door and window.

Windows to replaceCount openings, not sashes. A double hung is one window. Most crews quote a lower price per window past about 8 openings because the setup and disposal are shared.Window typeRanges are 2026 US installed prices for a standard size vinyl unit. Cutting a new basement egress opening into a poured wall is a different job and typically runs $3,500 to $6,500 with the well.Frame materialVinyl is the baseline. Fiberglass holds paint and moves less in big units, wood needs a clad exterior in wet climates, and bare aluminum is not sold as a thermally broken residential frame in cold zones.Glass packageArgon adds a few percent for about U-0.02 of improvement. Triple pane earns its 28 percent premium in the Northern zone and on street-noise elevations, less elsewhere.Install methodAn insert keeps the existing frame and trim and loses about 2 to 3 in of glass each way. Full frame strips to the rough opening, so rotted sills and missing flashing get fixed.Size categoryUnits over about 28 sq ft or over 100 lb need two installers and sometimes a lift, which is most of the oversized premium.Exterior trim or siding workFull frame replacement almost always needs at least new trim and flashing. Fiber cement and stucco cost more to cut and patch than vinyl or wood siding.ENERGY STAR climate zoneENERGY STAR uses four zones, not the eight IECC zones. Version 7.0 has been in force since October 23, 2023, and the NFRC label on the glass carries the numbers.

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Results

Total range: $5,830 to $12,720; 10 double hung windows, vinyl frame, low-e argon glass, standard size, insert install
Per window: $583 to $1,272; Installed, including tear-out and haul away. Warning: an insert shrinks the clear opening, so a bedroom window near the IRC R310.2.1 minimum of 5.7 sq ft can drop below it
Full frame instead of inserts: $2,041 to $4,452; Full frame runs about 35% more. It is the only option when the existing jambs are rotted, and it is the only way to add flashing that meets IRC R703.4
Exterior trim and flashing: Not included; Choose an exterior option if the trim is rotted, the siding has to be cut back, or the job is full frame
ENERGY STAR Northern criteria: U-0.22, SHGC 0.17 or higher; Version 7.0 numbers from the NFRC label. The 2021 IECC minimum for the same area is U-0.30, so an ENERGY STAR unit clears code with room to spare
Typical energy saving: $27 to $583 a year; ENERGY STAR puts whole-house savings at $101 to $583 a year over single pane and $27 to $197 over clear double pane. At this budget that is roughly 27 to 83 years to pay back, so comfort, rot and operation usually drive the decision

Window Replacement Cost formula

Per window = type range x frame multiplier x glass multiplier x size multiplier x install multiplier
Per opening total = Per window + exterior trim and flashing allowance
Total = Per opening total x window count
Full frame premium = Per window x 0.35 x window count

Worked example

Eighteen large casement windows in fiberglass frames with triple pane glass, done full frame with new exterior trim and flashing, in the Northern zone. The casement base is $650 to $1,500. Fiberglass multiplies by 1.35, triple pane by 1.28 and the large size by 1.2, which gives $1,348 to $3,110 per window as an insert.

Full frame multiplies that by 1.35, so each window is $1,820 to $4,199, and the new trim and flashing adds $150 to $400 on top. That is $1,970 to $4,599 per opening, or about $35,450 to $82,780 for all 18. The full frame decision alone accounts for roughly $8,500 to $19,600 of it, which is the price of getting new flashing and sound sills under every window.

Quick reference

Typical 2026 US installed cost per window: standard size, double pane low-E argon, insert replacement
Window type	Frame	Installed range each
Single hung	Vinyl	$477 to $1,007
Double hung	Vinyl	$583 to $1,272
Double hung	Fiberglass	$787 to $1,717
Double hung	Wood	$845 to $1,844
Horizontal slider	Vinyl	$530 to $1,166
Picture or fixed	Vinyl	$530 to $1,378
Casement	Vinyl	$689 to $1,590
Casement	Fiberglass	$930 to $2,147
Basement egress, existing opening	Vinyl	$954 to $2,332
Bay or bow	Vinyl	$2,332 to $5,830

Insert against full frame is the real price decision

An insert, also called a pocket replacement, drops a new unit into the existing frame after the sashes and the balance hardware come out. The exterior trim, the brickmould and the interior casing stay, the job takes about an hour per opening, and it is the cheaper path. The cost is glass: the new frame sits inside the old one, so each window loses roughly 2 to 3 inches of visible opening in width and in height.

Full frame strips the opening back to the studs, which is about 35 percent more. That is what buys new flashing lapped into the water resistive barrier under IRC R703.4, a chance to replace a rotted sill, and the original opening size back. Choose it when the jambs are soft, when the siding is coming off anyway, or when a bedroom opening is close to the 5.7 square foot escape minimum. A quote that does not say which method it prices is not comparable to one that does.

What the label numbers mean, and what they actually save

Two numbers on the NFRC label matter. U-factor is heat loss, lower is better, and it drives the winter bill. SHGC is how much solar heat gets through. In the South a low SHGC keeps summer load down, while in the North a higher one is free winter heat. ENERGY STAR Version 7.0 asks for U-0.22 with SHGC 0.17 or higher in the Northern zone, and U-0.25 with SHGC 0.40 or lower in North-Central. South-Central is U-0.28 and Southern U-0.32, both with SHGC 0.23 or lower. The 2021 IECC floor is looser, at U-0.30 across zones 3 through 8.

Be honest about payback. ENERGY STAR puts typical whole-house savings at $101 to $583 a year against single pane windows and $27 to $197 against clear double pane. Against a $9,000 job that is roughly 27 years at the single pane figure and far longer against double pane. There is no federal help left to shorten it. Under Public Law 119-21 the section 25C energy efficient home improvement credit ended for property placed in service after December 31, 2025, so a 2026 installation does not qualify. Remaining incentives are state, utility or local, and they vary a great deal. Check your own utility before assuming anything. Windows are usually bought for rot, operation, noise and comfort, with the energy saving as a bonus.

What this calculator leaves out

Interior work is not in the price: drywall returns, new stool and apron, casing, paint and stain touch-up after a full frame job. Nor is the lead-safe surcharge on a pre-1978 house, where an EPA RRP certified firm and containment typically add $50 to $150 per opening. Permits are also outside the number, and most jurisdictions require one for window replacement at typically $75 to $400 for the job. So are a structural header where an opening is being widened, exterior storm windows, custom grille patterns, and obscure or laminated glass upgrades. Any window well, drain or ladder that a new basement egress opening needs sits outside it too. Second story work that calls for staging rather than ladders adds labor the size multiplier does not cover.

Code limits that apply

IRC R310.2.1checked
Escape opening 5.7 sq ft net clear, 24 in minimum height, 20 in wide, sill within 44 in
If you miss it: A bedroom insert that shrinks the opening below the minimum is failed and the unit has to come back out
IRC R310.5
A replacement in an existing escape opening may be the largest standard unit that fits
If you miss it: Enlarging a masonry opening that the exemption already covers adds thousands to the job for nothing
IRC R308.4
Tempered glass within 24 in of a door edge, within 60 in of a tub floor, and near stairs
If you miss it: Annealed glass in a hazardous location is written up at final and the sash has to be reordered
IRC R312.2.1
Sill at least 24 in above the floor where the opening is more than 72 in above the grade below
If you miss it: A low sill on an upper floor needs a window opening control device before the job passes
IRC R703.4
Flashing at every window and door opening, lapped into the water resistive barrier
If you miss it: Caulk in place of head flashing lets water behind the siding and rots the sheathing under the sill
IECC Table R402.1.2
Fenestration U-factor 0.30 in zones 3 to 8, 0.40 in zone 2, SHGC 0.25 in zones 1 to 3
If you miss it: A clear double pane unit with no low-E coating misses the U-factor and the SHGC in most of the country

Provision	Limit	If you miss it
IRC R310.2.1checked	Escape opening 5.7 sq ft net clear, 24 in minimum height, 20 in wide, sill within 44 in	A bedroom insert that shrinks the opening below the minimum is failed and the unit has to come back out
IRC R310.5	A replacement in an existing escape opening may be the largest standard unit that fits	Enlarging a masonry opening that the exemption already covers adds thousands to the job for nothing
IRC R308.4	Tempered glass within 24 in of a door edge, within 60 in of a tub floor, and near stairs	Annealed glass in a hazardous location is written up at final and the sash has to be reordered
IRC R312.2.1	Sill at least 24 in above the floor where the opening is more than 72 in above the grade below	A low sill on an upper floor needs a window opening control device before the job passes
IRC R703.4	Flashing at every window and door opening, lapped into the water resistive barrier	Caulk in place of head flashing lets water behind the siding and rots the sheathing under the sill
IECC Table R402.1.2	Fenestration U-factor 0.30 in zones 3 to 8, 0.40 in zone 2, SHGC 0.25 in zones 1 to 3	A clear double pane unit with no low-E coating misses the U-factor and the SHGC in most of the country

Rows marked checked produce a warning in the results when an entry crosses the limit. The others are on the plans or on site and this calculator does not test them. Local amendments can be stricter; the adopted edition and the inspector govern.

Mistakes that cost money

Measuring the old sash instead of the frame. An insert is sized to the smallest jamb-to-jamb dimension at three heights, not to the glass.
Ordering inserts for a bedroom near the 5.7 sq ft escape minimum. The lost 2 to 3 in each way can put the opening under IRC R310.2.1.
Skipping tempered glass beside a door, a tub or a stairway. IRC R308.4 makes those hazardous locations and the inspector checks the etched bug.
Taking a quote that does not name the install method. Insert against full frame is a 35 percent swing and the two jobs are not comparable.
Leaving a rotted sill under a new insert. The frame the unit fastens to has to be sound, or the new window moves with it.
Assuming a lead-safe surcharge is included. Pre-1978 homes need an EPA RRP certified firm, and containment adds typically $50 to $150 per opening.

Key facts

ENERGY STAR Version 7.0, in force since October 23, 2023, requires a Northern zone window U-factor of 0.22 or lower, down from 0.27 under Version 6.
ENERGY STAR estimates typical whole-house savings of $101 to $583 a year when single pane windows are replaced, and $27 to $197 when clear double pane windows are.
The federal 25C energy efficient home improvement credit covered windows placed in service through December 31, 2025, and does not apply to a 2026 installation.
IRC R310.2.1 sets an emergency escape opening at 5.7 sq ft net clear, at least 24 in high and 20 in wide. The sill may be no more than 44 in above the floor.
The 2021 IECC caps fenestration U-factor at 0.30 in climate zones 3 through 8 and 0.40 in zone 2, and caps SHGC at 0.25 in zones 1 through 3.

Frequently asked questions

How much does it cost to replace 10 windows?

Ten standard double hung vinyl windows with low-E argon glass, installed as inserts, typically run $5,830 to $12,720, or $583 to $1,272 each. Fiberglass or wood frames, triple pane glass, or a full frame install each add 6 to 55 percent.

Is there a tax credit for new windows in 2026?

No federal one. The section 25C energy efficient home improvement credit applied to property placed in service through December 31, 2025 and is not available after that. State, utility and local rebates may still exist, so check your utility.

Is insert or full frame window replacement better?

Insert is cheaper and faster and keeps the trim, but loses about 2 to 3 inches of opening each way. Full frame costs about 35 percent more and is the only way to replace a rotted sill or add flashing that meets IRC R703.4.

Are triple pane windows worth the money?

In the ENERGY STAR Northern zone and on noisy streets, often yes. Triple pane adds about 28 percent to the window price and takes U-factor from roughly 0.27 to 0.18. In the Southern zone the extra pane rarely pays back.

Sources and references

Residential Windows, Doors and Skylights Key Product Criteria (ENERGY STAR)
Energy Efficient Home Improvement Credit (section 25C) (Internal Revenue Service)
Energy Performance Ratings for windows, explained (National Fenestration Rating Council)
Chapter 3 Building Planning, R308 glazing and R310 emergency escape openings, 2021 IRC (ICC)

Next steps for this project

The usual order for a insulation & hvac project. See all insulation & hvac calculators.

Results are estimates based on standard formulas and typical product specifications. Confirm quantities with your supplier and local code before ordering.