How much do insulated & thermal windows cost?
Ashburn, VA

How much do insulated & thermal windows cost?

Ashburn, VA

How much do insulated & thermal windows cost?

$400 – $3,000cost per window installed
$6,000 – $60,000average cost for whole house (15 – 20 windows)

Get free estimates for your project or view our cost guide below:

$400 – $3,000 cost per window installed

$6,000 – $60,000 average cost for whole house (15 – 20 windows)

Get free estimates for your project or view our cost guide below:
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Tamatha Hazen
Written by
Tamatha Hazen
Edited by
Kristen Cramer
Fact-checked by
Tom Grupa

Average insulated & thermal windows cost

Insulated or thermal windows cost $400 to $3,000 per window or $6,000 to $60,000 for an entire home, depending on the glass type. Double-pane glass is the most common thermal window costing $400 to $2,000 per window installed. For extreme climates, a triple-pane thermal window costs $450 to $3,000 per window installed.

Insulated window installation costs
Number of windows Average total cost
1 $400 – $3,000
2 $800 – $6,000
5 $2,000 – $15,000
10 $4,000 – $30,000
15 $6,000 – $45,000
20 $8,000 – $60,000
25 $10,000 – $75,000
30 $12,000 – $90,000
35 $14,000 – $105,000

Insulated or thermal windows are designed for energy efficiency using double or triple layers of glass with air space in between the layers. The extra glass and spacer help hold in heat during the winter and block heat in the summer. Insulated windows go by several names including:

  • Thermal windows

  • Insulated Glass Units (IGUs)

  • Double-pane or double-glazed windows

  • Dual-pane or dual-glazed windows

  • Triple-pane or triple-glazed windows

Get free estimates from window installers near you.

Double-pane vs. triple-pane windows cost

Double-pane windows cost $400 to $2,000 per window installed and are the industry standard for window replacement and new home construction. Triple-pane windows cost $450 to $3,000 per window installed and offer greater energy efficiency for extreme climates.

Double-pane vs. triple-pane window cost comparison
Factor Double-pane Triple-pane
Cost (per window installed) $400 – $2,000 $450 – $3,000
Energy efficiency 30% savings over single-pane 50% energy savings over single-pane
Lifespan 15 – 20 years 20 – 30+ years
Insulation R-value 7 – 8 3 – 3.8
Safety Strong Stronger
Noise reduction 30% noise reduction over single-pane 50% noise reduction over single-pane

A modern dining room with new triple-pane windows.
A modern dining room with new triple-pane windows.

Some alternative options to double-pane or triple-pane thermal windows include:

  • Storm windows cost $150 to $400 per window to install a separate, single-glazed pane over the existing windows

  • Low-E storm windows are coated with a thin layer of metal that reflects infrared heat for better thermal protection.

  • Insulated glass units (IGUs) or Thermopane glass costs $10 to $14 per square foot for replacement glass panels inserted into your existing window frames.

  • Weatherstripping costs $5 to 10 per window installed to prevent air leaks and heat loss around the windows.

Thermal window cost by style

Thermal double-paned windows are available in every window style. Most manufacturers offer triple-paned windows as an upgrade but style options may be more limited.

Thermal window cost by window type
Window type Average installed cost per window* Description
Bay window cost $2,000 – $6,000 Group of 3 angled windows extending outside the house wall
Bow $2,000 – $6,000 Arc shape grouping of 4 to 6+ windows that extend outside the house wall
Casement window cost $300 – $1,100 Side-hinged window that cranks to open outward
Double-hung $400 – $2,000 Two operational sashes that slide up or down
Single-hung $300 – $1,500 One operational sash that can be raised and lowered
Fixed picture window cost $450 – $1,500 Stationary picture window that does not open
Slider $400 – $2,000 Window on a top and bottom track that opens horizontally, usually with one fixed and one operational side
Hurricane window cost $400 – $1,200 Heavy-duty window frame with impact-resistant glass to withstand Category 5 storms

*Prices are for double-pane window installation

Double-pane casement windows in a residential home.
Double-pane casement windows in a residential home.

Cost factors for insulated windows installation

Insulated windows prices average $300 to $2,200 for the window alone, depending on the material, number of glass panes, and gas spacer used.

Insulated window cost calculator
Factor Average cost per window
Materials $300 – $2,200
Labor $100 – $800
Total cost installed $400 – $3,000

Other cost factors include:

  • Glass type – Triple-pane glass is more expensive and costs more to install than double-pane glass.

  • Insulated filler – Air-filled glass spacers are cheaper than gas-filled spacers. Krypton gas is the most expensive fill, while argon gas fill is the least expensive.

  • U-value – Windows with a low U-Factor are better insulated and more expensive than windows with a higher U-value.

  • Window location – Second-story installations and high windows requiring scaffolding take longer and cost more to install.

  • Window material – Wooden window frames are more costly than fiberglass or vinyl windows. choices.

  • Window size & type – Large bay and bow windows cost the most since they have multiple panels of glass. Smaller windows are easier and cheaper to install.

Labor cost to install insulated windows

Labor costs to install insulated windows average $100 to $500 per window for double-pane glass and up to $800 per window for heavier triple-pane windows. Labor costs $50 per hour per installer, with more installers needed to install the heavier glass.

Unexpected repair costs may arise during the installation, adding to the total project cost:

Insulated windows price by material

Insulated windows come in many different materials, and your material choice affects the cost, lifespan, and efficiency of your new windows. High-quality materials cost more up front but save you money in the long run by preventing costly repairs and replacements.

Insulated window prices by material
Window material Average installed cost per window Pros and cons
Aluminum $250 – $850
  • Affordable
  • Durable and strong
  • Tends to corrode
  • Not good for coastal areas
Fiberglass $550 – $2,100
  • Durable
  • Wide range of colors and styles
  • Rigid material is more difficult to install
Steel $500 – $5,500
  • Strong
  • Rust-resistant
  • Low-maintenance
  • Expensive
  • Heavy material
Vinyl $250 – $1,500
  • Low-cost
  • Low-maintenance
  • Energy efficient
  • Easy to install
  • Limited styles and colors
Wood $350 – $3,000
  • Beautiful
  • Traditional look
  • Good insulator
  • Expensive
  • Needs paint
  • Attracts pests

Cross-section view of triple-pane windows.
Cross-section view of triple-pane windows.

Insulated window brands

Most window brands offer insulated windows, but each manufacturer offers different window styles and materials to choose from. It's important to look at windows of the same material and style when comparing prices and features for different brands and collections.

  • Pella windows cost $300 to $3,500 for their all-vinyl windows.

  • Andersen Windows cost $400 to $4,000. Andersen sells mostly Fibrex wood composite windows.

  • Marvin windows cost $800 to $2,000 for their proprietary Ultrex fiberglass windows.

  • Window World windows cost $300 to $1,300 for their budget-friendly vinyl windows.

  • Milgard windows are vinyl and fiberglass and range in price from $200 to $2,000.

  • Simonton windows cost around $200 for their affordable vinyl collections and $1,000 or more for their fiberglass windows.

  • Ply Gem windows cost around $450 to $2,000, depending on whether installing vinyl, aluminum-clad wood, aluminum, or wood composite windows.

Insulated windows upgrades and add-ons

There are several upgrades and add-ons available to improve the energy efficiency, safety, and privacy of your insulated windows. Some of the most common options include:

Get free estimates from window installers near you.

Insulated windows FAQs

What are insulated windows?

Insulated windows have two or more panes of glass separated by an air space. The air space acts as an insulator, keeping heat in during the winter and out during the summer. The two main types of insulated windows are double-pane and triple-pane.

Are insulated windows worth the cost?

Double-pane insulated windows are the standard nowadays and are worth the cost, reducing electric bills by 30% over single-paned windows. Costly triple-pane insulated windows are the most energy efficient and worth the price if you live in a cold climate with high heating bills.

How long do insulated windows last?

Insulated windows last 15 to 20 for double-paned windows and up to 30 years for triple-paned windows. The windows may lose their insulation over time due to air or gas leakage, especially in cold climates. Resealing the edges and replacing the gas can prolong their lifespan.

Does window insulation film work?

Window insulation film is a cost-effective way to reduce heat loss and improve energy efficiency. The thin insulating barrier keeps the home cooler in the summer and warmer in the winter.

Getting estimates from insulated windows installers

Consider these suggestions to help you choose the best window installer near you:

  • Limit your search to only licensed, bonded, and insured window installers.

  • Get several estimates with the same product material and glass type for a more accurate comparison.

  • Avoid the lowest estimates which often result in substandard work.

  • Check online reviews on HomeGuide and Google.

  • Get everything in writing before paying the deposit, including the estimate, contract, and warranty details.

  • Avoid large upfront deposits and don't make the final payment until you are satisfied with the installation.

Questions to ask

Be sure you are getting the best installer for your new insulated windows by asking these important questions:

  • How long have you been installing windows in my area?

  • Do you recommend double-pane or triple-pane windows for my home?

  • How much will the installation cost?

  • What brand of insulated windows will fit my budget?

  • What does the estimate include?

  • How long will the installation take?

  • What does the warranty cover, and how long does it last?

  • Is there a better time of year for me to schedule the installation?

  • What happens if my siding or window frames are damaged during the installation?

  • Do you offer extended financing? What are the payment terms?