Cost of Bay Window Installation | 2024 Guide

By Amanda Lutz Reviewed By NFRC Updated April 9, 2024

Typical costs range from $1,350 to $3,600.

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Bay window installation costs typically range from $1,350 to $3,600, but most homeowners will pay around $2,400 on average. Bay windows date back to the Renaissance. They’re more common in some architectural styles than others, but can be a great choice for increasing natural light and adding resale value to your home. A bay window is actually a set of three windows that protrudes from an exterior wall. It’s comprised of one large central window and two smaller windows, positioned at an angle, on either side. The center window is usually fixed but the side windows can open, and the structure adds a bit of floor space to the room’s interior.

Below, we’ve broken down the different types of bay windows to help you start planning your project. Read our guide to the best window brands to begin researching options.

Average Bay Window Installation Cost

Bay window installation costs $1,350 to $3,600, with a national average of $2,400. Where your project falls within that price range primarily depends on the following factors.

Cost by Window Type

Some types of bay windows require more glass and framing materials, as well as a highly skilled installer. Here are the most common types and their average costs.

Window TypeMaterial CostsPrice With Installation

Bow Windows: $1,800-$5,800
Some people consider bow windows to be a different window type altogether, but they’re similar to bay windows in many ways. A bow window consists of four to six fixed picture windows set at a wide angle to form a curve instead of an angular alcove. They allow even more natural light in than bay windows. Because these windows contain larger glass panes, they tend to cost more than many other types of bay windows.

Box Bay Windows: $950-$1,400
Box bay windows have a smaller, simpler design. The side windows are set at a 90-degree angle to the large central window, and they’re usually not full-length. Box windows are often found in kitchens, and depending on how far they protrude from the home, they may also have a glass plane on top to create a small interior greenhouse. Box bay windows’ installation costs are on the lower end of the spectrum.

Circle Bay Windows: $2,800-$6,000
The term “circle bay window” may refer to multiple things: Some use the term to refer to a curved overall shape like a bow window but with only three glass panes. Others use it to refer to a bay window in which the actual glass panes are curved to fit the building’s contours. It also may refer to a structural shape curved into a semicircle rather than the gentler arch of a bow window. Regardless, the curved shape and large amount of glass required make this the costliest option.

Full Bay Windows: $1,200-$3,500
Full bay windows have the standard bay window shape with very large glass panes. They’re sometimes called canted bay windows since the two side windows are canted—or angled—from the center pane, usually at 30 or 45 degrees. When most people imagine bay windows, this is usually the type they’re picturing. A small reading nook or window seat will often fit in the interior space.

Oriel Bay Windows: $1,300-$3,800
An oriel bay window protrudes from the building’s exterior at window height but doesn’t reach all the way to the ground. This type of bay window is usually installed on a home’s upper floor, similar to an enclosed balcony, but can also be found on the ground floor. Oriel windows are often accompanied by ornate decorations on the home’s exterior.

Cost by Window Size

Larger windows cost more per unit as well as to install because they require more careful handling. Standard bay window panes are typically 3 feet wide, but height varies depending on the window type and style. Here are some approximate bay window installation costs by the square foot.

Window SizeSquare FootagePrice With Installation

Cost by Window Material

Like all windows, bay windows come in a variety of frame materials. These window materials have different benefits and drawbacks as well as different price points.

  • Aluminum bay windows: are typically the least expensive and most lightweight, but the material isn’t as durable and doesn’t insulate very well. Aluminum is rarely used for bay windows, but may be a good choice in warm or seaside climates.
  • Fiberglass: is a strong and highly durable window frame material. It’s low-maintenance and energy-efficient, but it’s not as readily available and the price can range from reasonable to high-end.
  • Wood bay windows: are the most traditional and provide a classic look and feel. However, wood requires a great deal of maintenance and repair. It also expands and contracts with changing temperature and humidity.
  • Vinyl or polyvinyl chloride (PVC): is one of the most common and cost-effective window frame materials. Vinyl bay windows are low-maintenance and reasonably durable but offer less customization options, and the material can warp in hot climates.
  • Steel: is typically only used as a framing material for modern or contemporary bay windows. It’s uncommon, expensive, and provides an industrial look. It’s also incredibly durable and has a long life span.
  • Clad windows: have an interior wood core covered with an exterior layer of vinyl, aluminum, or fiberglass. They are composite windows that combine the benefits of both frame materials, though they tend to cost a bit more.
Window MaterialPrice With Installation
Closeup of large bay window and red green flower decorations on sunny summer day and nobody architecture
Window Replacement Cost

Replacement windows on average range from $300 to $1,200.

Windows with fixed top sash and bottom sash that slides up, sash divided by white grilles a surrounded by white elegant frame horizontal white vinyl siding on a new construction residence
Single-Hung Windows

Single-hung windows on average cost $150 to $400 per window.

Energy Efficient Upgrades

Double-pane installation typically ranges from $450 to $1,000 per window.


Other Potential Cost Factors to Keep in Mind

Here are some other factors that may impact bay window prices.

Additional Options and Features

New bay windows open up a world of design possibilities, and many homeowners choose to do some additional decoration with the project. For example, you may choose to install window treatments such as curtains or blinds to increase privacy or install new seating or storage in the bay window’s nook. For the latter, you may require professional carpentry services.

Because the extra natural light from a bay window can increase your home’s temperature in the hottest months, you may opt for energy-efficient glass. Triple-layered glass with a Low-E coating reduces the amount of heat lost in winter and let in during summer, but that adds to the window unit’s cost. However, you’ll also receive long-term energy bill savings.

Delivery Fees

Bay windows are large and must be transported carefully. If you live a long distance from the manufacturer, you may end up paying additional delivery fees.

New vs. Existing Installation

Since this window type requires a specific structure in a home’s exterior wall, replacing a bay window costs less than installing a new one where there wasn’t one before. Contractors will likely need to move studs or load-bearing walls in order to accommodate the new structure, and you’ll almost certainly need permits. This substantially increases labor costs, and you’ll need to pay for new finishing such as drywall, paint, and siding.

Additionally, you may need to extend your roofline to cover the new bay window structure, or even build a bay roof addition. For this, you must hire a roofing contractor and either match your home’s current roofing material or choose a contrasting material to make the bay window stand out. Extra insulation and waterproofing will also be required.

Window Style

Your bay window style should match your home. While there’s no set price range for each architectural style, more elaborate, decorative styles cost more to install.

Craftsman Bay Windows

Bay windows in a craftsman bungalow are typically simple and meant to increase interior living space. They’re more functional than aesthetic, usually offering extra seating or storage in a kitchen or living room.

Midcentury Modern Bay Windows

Bay windows in a midcentury modern home are similarly minimalist and functional. They may be picture or casement windows, depending on whether the homeowners want the ability to open them for extra ventilation.

Modern Bay Windows

Modern bay windows tend to be very large, sometimes even floor-to-ceiling. The framing is minimal around tall panes of unobstructed glass, usually without curtains or other window treatments. Modern or contemporary bay windows maximize natural light, but may create privacy and energy efficiency concerns.

Tudor Bay Windows

Bay windows on Tudor-style homes are often oriel windows, which means they’re smaller and don’t go all the way to the floor. They’re usually supported by wooden brackets to match the home’s exterior. Casement windows in groups of two or three are common here.

Victorian Bay Windows

Bay windows are strongly associated with Victorian-style homes like those found in San Francisco. Though Victorian bay windows have a standard canted structure, they’re usually the most ornate, making them more expensive to design and install.

Window Brand

Most window brands offer a variety of sizes, styles, and price points. Note that different companies will offer different selections, materials, and customization levels. Here are some top window brands and what they typically charge.

Window BrandUnit CostPrice With Installation

How to Make Bay Window Installation Cost-Effective

Even when hiring professionals, you can still take steps to reduce your total project cost.

Go for a minimalist look. Decorations or customization can raise the total price.

Balance up-front material costs with durability for long-term savings. You don’t want to replace your windows any sooner than necessary.

Have all of your window replacements done at the same time. You can often get a discount for multiple window installations as part of a single project.

Get a free quote from at least three local companies to get a better sense of installation costs in your area.

When possible, negotiate with the installer for a lower price.

Professional vs. DIY Bay Window Installation

Installing a bay window is not a home improvement job that most homeowners can take on themselves. Here’s why.

Professional Window Installation

Particularly if you’re building a new bay window, installation requires a great deal of knowledge and skill. Often, the process requires making structural alterations to load-bearing walls, which is something a professional contractor should do to ensure your safety and your home’s structural integrity. A window installation company employs experienced professionals who know how to properly insulate and waterproof new windows. They’ll also ensure the project is up to code, protecting your home’s value.

DIY Window Installation

While homeowners may be able to replace simple single- or double-hung windows themselves, bay window installation is too complex for do-it-yourself (DIY) enthusiasts. You would need to be proficient not just in window installation but also in carpentry, insulation, drywall, and potentially even roofing. If the window isn’t properly installed, you could be opening up your home to water damage and months of increased utility bills from air leakage, greatly outweighing any savings from doing the labor yourself.

Our Recommendation

Adding a bay window to your home can provide a better view of your outdoor surroundings while simultaneously increasing your home’s curb appeal. When planning for the cost of bay windows, we recommend budgeting for professional installation. Not only will a professional get the job done more quickly, but you’ll also typically receive a labor warranty in case problems arise later.

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Bay Window Installation Cost FAQ

How much does it cost to put a bay window in?

It typically costs $1,350 to $3,600 to install a full bay window with a fiberglass frame. You’ll likely pay more for specialty, customized, or particularly ornate windows as well as windows with wooden or steel frames.

Do bay windows add home value?

Bay windows increase a home’s market value thanks to the additional views, lighting, ventilation, and airflow they provide. As long as the windows are installed properly, they have an excellent return on investment.

What are the pros and cons of bay windows?

Here are some of the benefits and drawbacks of bay windows.Pro: They let in more natural light.Pro: They slightly increase the floor space and square footage of your home.Pro: They increase curb appeal and home value.Con: They’re pricey and complicated to install.Con: The extra natural light can increase cooling costs in summer.Con: If not installed properly, they can cause structural problems.

What is the most common type of bay window?

The most common type of bay window is double-hung or casement. Casement windows open on one side by means of a hand crank, and double-hung windows have two vertical sashes that can slide up and down to open.

How We Chose the Top Window Brands

We researched and analyzed dozens of window manufacturers. We then crafted a rating system based on each brand’s standard and energy-efficient product offerings.

We spoke directly to representatives at each company to learn how the installation process works and determine how each brand personalizes its windows for each home. We also closely analyzed each company’s warranty options to ensure their product and labor guarantees match or exceed industry standards. 

Finally, we assessed the manufacturer’s years of experience and customer reputation. In addition, we analyzed the 100 most recent Google Reviews for each provider across various locations and branches.