How the calculator prices new windows
Window quotes vary more than almost any other home project: the same ten windows can be priced at $7,000 by one company and $20,000 by another. The calculator starts from one price for a plain, standard window and scales it for what makes windows cost more. Here is the math with the values it opens with: ten 36 x 60 inch vinyl double-hung windows, installed as inserts, with double-pane low-E glass, replacing single-pane windows.
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1
Start from the base price
A standard 3 x 5 ft vinyl double-hung insert, installed, is $1,000 by default. National guides put the average replacement window at about $800 with most between $450 and $1,200, while the Cost vs. Value report's full-service vinyl job works out to about $2,200 a window. Enter your own quote to recalibrate everything.
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2
Adjust for the window
The base is multiplied by the type (casement 1.2, picture 0.85, bay 2), the frame (aluminum 0.8, fiberglass 1.4, wood 1.6), the glass (triple-pane 1.15) and full-frame installation (1.3). For the defaults every factor is 1, so each window stays at $1,000.
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3
Adjust for size
36 x 60 inches is 15 sq ft of window. Part of a window's price is fixed (labor, hardware, the trip) and part grows with the glass, so the size factor is 0.55 + 0.45 x (area ÷ 15). At 15 sq ft it is exactly 1. A 48 x 72 window (24 sq ft) gets 1.27.
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4
Multiply and add the permit
10 windows x $1,000 = $10,000, plus a $150 permit, is $10,150. Real quotes for the same job usually land between 70% and 150% of that: $7,150 to $15,150.
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5
Estimate the energy savings
ENERGY STAR puts the average saving from replacing poor windows at about 12% of a home's energy costs. 12% of $2,400 a year is $288. $10,150 ÷ $288 = 35 years to pay back from bills alone.
That last number surprises people, but it matches what energy agencies say: replace windows when they are failing, drafty, rotting or painted shut, or for comfort and resale, not as a pure money-saving investment. Replacing single-pane windows pays back faster than replacing double-pane ones, and a cold climate with high heating costs shortens the payback.
Cost by frame material
Installed price per window from national cost guides, next to what the calculator gives a standard 3 x 5 ft double-hung insert at its defaults.
| Frame | Typical per window | Calculator |
|---|---|---|
| Aluminum | $200–$800 | $800 |
| Vinyl | $350–$800 | $1,000 |
| Fiberglass | $400–$1,500 | $1,400 |
| Wood | $600–$2,000 | $1,600 |
Vinyl is the most popular: no painting, but limited colors. Aluminum is strong and slim but conducts heat unless the frame is thermally broken. Fiberglass stays stable in heat and cold and can be painted. Wood has the classic look and needs paint or stain outside, which is why many wood windows come clad in vinyl or aluminum.
The calculator's default sits above the low end of the guides on purpose: cost guides average in cheap builder-grade units, and a contractor who handles everything (the Cost vs. Value report's model) charges far more. In the 2025 report, replacing ten 3 x 5 ft windows cost about $22,000 in vinyl and $26,800 in wood.
Cost by window type
| Type | Typical per window | Good for |
|---|---|---|
| Double-hung | $300–$1,000 | Most rooms; both sashes tilt in to clean |
| Casement | $400–$1,200 | Over sinks, catching breezes, tight seal |
| Slider | $700–$1,500 | Wide, short openings; basements |
| Picture | $300–$1,600 | Views and light; does not open |
| Bay | $900–$4,500 | Adds space and light; may need roof and support work |
Tap a type to load it with a typical size. Guides disagree on sliders: they are simple windows, but they usually come wide, which is why the range runs high. The calculator prices a slider at 0.95 of a double-hung of the same size. A bay is three windows joined in a projecting frame and is always installed full-frame; the bay preset loads one 84 x 60 inch bay, about $4,200 at the defaults.
Insert or full-frame replacement?
An insert (also called pocket replacement) leaves the old frame, interior trim and exterior siding in place. The installer removes the sashes, sets a new window into the old frame and seals it. It is faster, cheaper and less messy, but the new frame sits inside the old one, so you lose an inch or so of glass all around.
Full-frame replacement strips the opening down to the studs. It costs more (the calculator adds 30%) because trim, and sometimes siding, has to be removed and redone, but it is the right choice when the old frame is rotten or out of square, when water has been getting in, or when you want a different size or style. It also lets the installer flash the opening properly, which is the best defense against leaks. Ask the contractor to probe the sills before quoting an insert: an insert over soft wood traps the problem.
Glass: double, triple and low-E
Two numbers on the window's NFRC label matter most. The U-factor measures heat loss: lower is better in cold climates. The solar heat gain coefficient (SHGC) measures how much sun heat comes through: lower is better in hot climates. ENERGY STAR sets limits for four zones, Northern, North-Central, South-Central and Southern, so a certified window for Minnesota is not the same as one for Florida. Low-E coatings and argon gas are standard on most new double-pane windows. Triple-pane glass (priced here at 15% more, an estimate) is worth it mainly in the North, for comfort and noise.
Energy savings and payback, honestly
Windows cover about 8% of a home's exterior surface but account for about 45% of its heat gain and loss, which is why they feel like an obvious upgrade. In dollars, ENERGY STAR estimates about 12% savings on average, roughly $200 to $600 a year, when poor windows are replaced. The calculator applies 12% for single-pane windows, 5% for clear double-pane and 1.5% for double-pane low-E, then scales by the share of the home's windows you replace. The 5% and 1.5% are our estimates: in ENERGY STAR's regional figures, replacing clear double-pane windows saves about half as much as replacing single-pane ones, and no federal source gives a figure for replacing low-E glass.
| Replacing | Savings, $2,400 bills | Payback on $10,150 |
|---|---|---|
| Single-pane | $288 a year | 35 years |
| Double-pane, clear | $120 a year | 85 years |
| Double-pane, low-E | $36 a year | over 100 years |
Two things soften that picture. First, resale: the 2025 Cost vs. Value report found vinyl window replacement recoups about 76% of its cost when the house sells, and wood about 70%. Second, the windows may need replacing anyway. If they are rotting or failing, the fair comparison is new windows against repairs, not against doing nothing.
If energy is the only goal, cheaper steps come first: weatherstripping and caulking, and low-E storm windows over existing single-pane windows, which ENERGY STAR estimates can save about 20% on heating and cooling. The federal tax credit for efficient windows (30%, up to $600) ended for windows placed in service after December 31, 2025, but some utilities and states still pay rebates.
Tips before you sign
- Get three quotes that name the product: brand, model line, U-factor and SHGC. Quotes that leave these out cannot be compared.
- Bundle the job. ENERGY STAR notes that installers charge more per window for small jobs; ordering 8 to 10 windows at once gets better pricing.
- Read all three warranties: the product, the glass seal and the installation. Labor coverage matters as much as the frame.
- Mind lead paint. In homes built before 1978, removing old windows disturbs painted surfaces, and the EPA's Renovation, Repair and Painting rule requires a lead-safe certified firm.
- Keep bedroom windows code-legal. The International Residential Code requires an emergency escape opening in sleeping rooms, generally at least 5.7 sq ft of clear opening, 24 inches high and 20 inches wide, with a sill no more than 44 inches above the floor. A smaller insert can make an old window fail that test.
- Ask about safety glass near doors, tubs, showers and stairs, where codes require tempered glass.
- Watch high-pressure sales. "Today only" discounts off an inflated list price are common in this trade. A fair price will still be fair next week.
Common questions
How much does it cost to replace 10 windows?
About $7,000 to $15,000 for ten standard 3 by 5 foot vinyl double-hung windows installed as inserts, or roughly $1,000 each. Full-frame installation, wood or fiberglass frames, and bigger or specialty windows push the total to $20,000 and more.
What is the difference between insert and full-frame window replacement?
An insert, or pocket, window slides into the old frame, so the interior trim and siding stay put. It costs less but gives up a little glass. Full-frame replacement removes everything down to the rough opening, which lets the installer fix rot, flash the opening properly and change the window size.
How much will new windows save on my energy bill?
ENERGY STAR estimates that replacing poor windows with certified ones saves about 12 percent of a home's energy costs on average, or about $200 to $600 a year depending on where you live. Replacing double-pane windows saves much less than replacing single-pane ones.
Do new windows pay for themselves?
Rarely through energy savings alone. Ten windows costing about $10,000 that save $300 a year take over 30 years to pay back. Most of the value comes back as comfort, less noise and maintenance, and resale, where window replacement recoups about 70 to 76 percent of its cost.
Is triple-pane glass worth it?
In cold northern climates triple-pane glass adds comfort and cuts noise, and many of the most efficient windows use it. In mild or hot climates a good double-pane low-E window with the right solar heat gain rating usually makes more sense for the money.
Is there a federal tax credit for new windows in 2026?
No. The federal credit of 30 percent up to $600 for ENERGY STAR Most Efficient windows ended for windows placed in service after December 31, 2025. Some utilities and states still offer rebates, so check the ENERGY STAR Rebate Finder for your ZIP code.
Sources and assumptions
This is an estimate for planning and comparing quotes, not a bid. Prices are typical US installed prices checked in October 2026. The base price and your energy bill can both be edited; the multipliers are our own estimates built from the ranges below.
- Prices per window by frame, type and glass, the $800 average, the $450 to $1,200 typical range, labor at about 30% of the cost and permits at $50 to $300 come from Fixr, window replacement cost (January 2026).
- Full-service job cost and resale: the 2025 Cost vs. Value report (Zonda/JLC) prices ten vinyl windows at $22,073 with 75.5% recouped at sale, and wood at $26,781 with 70% recouped. The calculator applies the vinyl figure to aluminum and fiberglass too.
- Energy savings: about 12% of energy costs, $200 to $600 a year, windows at 8% of the exterior and 45% of heat gain and loss, and the advice to order 8 to 10 windows come from ENERGY STAR's certified windows key messages (2024) and its windows fact sheet. The 5% and 1.5% figures for double-pane windows are our estimates, scaled from older ENERGY STAR ranges that put double-pane savings at roughly a third of single-pane savings. Storm windows: ENERGY STAR Home Upgrade, windows and storm windows.
- Energy bill: the $2,400 default is an estimate. The EIA's 2020 Residential Energy Consumption Survey put the average household at about $1,880 a year, and prices have risen since. Add up a year of your own electric, gas, oil or propane bills for a real number.
- Tax credit: the Energy Efficient Home Improvement Credit ended for property placed in service after December 31, 2025; see the IRS page on the credit. Rebates: the ENERGY STAR Rebate Finder.
- Rules and safety: the EPA Renovation, Repair and Painting program for pre-1978 homes, and the International Residential Code sections on emergency escape openings (R310) and safety glazing (R308); your local code may differ.
- Savings by old glass type (estimates): ENERGY STAR's window benefits page (archived January 2022; DOE modeling with 2006–2007 energy prices) put typical savings at $101 to $583 a year when replacing single-pane windows and $27 to $197 when replacing clear double-pane, about 48% as much on average across its regions. We apply a bit less than half of 12% (5%) for clear double-pane and 1.5% for low-E, which has no published figure.
- Multipliers (estimates): type, casement 1.2, slider 0.95, picture 0.85, bay 2; frame, aluminum 0.8, fiberglass 1.4, wood 1.6; full-frame 1.3; clear glass 0.93, triple-pane 1.15; size 0.55 + 0.45 x (area ÷ 15 sq ft), limited to 0.7 to 3. The quote range is 70% to 150% of the estimate. Fixr's per-window ranges by type (for example picture $300 to $1,600, sliding $700 to $1,500, bay $900 to $4,500) likely also reflect the larger size of those units, which the calculator handles with its separate size factor, so its type multipliers are lower than a straight ratio of Fixr's ranges.