How Much Does a Bay Window Cost to Install?

Opt for a bay window if you’re looking for a versatile way to add light and space to a room. Bay window costs can range from $950 to $7,500, with the national average at $2,500.
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Bay Window Cost
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  • Bay windows typically cost between $950 and $7,500 to install, with a national average cost of $2,500.
  • Some of the main factors affecting the total cost of bay window installation include the size, style, and configuration of the window; the window manufacturer; the type of material; the scope of the project; the cost of adding a roof to the bay window; and the cost of labor and permits.
  • Bay windows have several benefits, such as an increase in property value, better natural light, an improved range of view, an increased room size, and additional seating.
  • Incorrect installation of a bay window can cause structural damage, which will cost much more to repair than the labor cost to hire a pro to install a bay window. That’s why it’s recommended to leave bay window installation to a professional window installation company.

A bay window increases curb appeal, brightens a room, adds extra storage, and creates a cozy area for reading or dining. And knowing how much to budget for bay windows can help keep the project on track. According to Angi and HomeAdvisor, bay window installation cost ranges from $950 to $7,500, with many homeowners paying around $2,500. The higher prices usually include a more intricate seating area or opting for energy-efficient windows. Bay window cost can vary depending on if the project involves a new installation or replacement windows. The prices of installing new bay windows are affected by how much construction is needed to install the windows. Bay window replacement cost is typically around $1,800 per window, with labor averaging between $100 and $300. Other factors that can impact the cost of bay window installation are the location of the window, the type of window, and the size. Before searching for bay windows for sale, homeowners will want to consider the factors that impact window prices.

Bay vs. Bow Windows 

Bow window vs. bay window—what’s the difference? A bay window is constructed of three windows that are attached. The center window is typically larger and placed flat, while the other two are set at a 30- or 40-degree angle. This type of window protrudes from the side of the house and creates more square footage. Many homeowners prefer to add seating with storage options to the inside sill area. Bay windows come in various sizes and materials, creating differences in pricing.

Bow windows are sometimes called bay windows, but they’re actually different. They don’t protrude from the house as far as bay windows, and they’re constructed of four to six glass panels that offer panoramic views. Bow windows are usually more expensive than bay windows since there are more panes of glass, and the option for seating and storage is reduced since bow windows don’t stick out as far as bay windows.

What’s the difference between bow window vs. bay window cost? Bow windows range between $1,500 and $6,500 each for a replacement. Installing new bow windows can cost as much as $3,000 to $10,000 each, including labor. Bay windows are less expensive at $1,800 each for replacement and between $1,000 and $7,000 for new installation. Some window installation companies provide a bay window cost calculator on their website where homeowners can plug in their ZIP code to discover up-to-date pricing in their area.

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Factors in Calculating Cost

Several factors can impact bay window costs. Prices can diverge from the national average due to replacement vs. new window costs; window size, style, and configuration; the manufacturer; window material; construction for the bay roof addition; the project scope; and the cost of labor, permit, and delivery fees.

Bay Window Cost
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New vs. Replacement Window

How much does a bay window cost? It can depend on whether the homeowner is replacing an existing bay window or installing a new one. Window replacement costs will be lower than new installation costs because of the additional work needed. A new installation project can range from $1,000 to $7,000, depending on the new windows’ location, material, and size. Replacing a bay window averages around $1,800.

Window Size

Since bay windows can be installed in any area and level of a home, the overall size can vary greatly. Bay windows come in hundreds of different sizes to fit a space’s individual needs. Height, width, projection, and ratio are considered when getting the best fit for bay windows. Each type and style of bay window affects how far it will project out from the side of the house. Bay windows are often custom made, although they usually span from 3 to 10 feet wide by 3 to 6 feet high, with some sizing more common than others.

  • 4 feet by 3 feet: $750 to $1,800
  • 6 feet by 3 feet: $850 to $2,800
  • 8 feet by 3 feet: $910 to $3,200
  • 10 feet by 3 feet: $850 to $3,850
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Window Size, Style, and Configuration 

The larger the project, the more expensive it will be. The cost to install a large bay window can cost as much as $7,100 or more, depending on location, customization, and complexity of the job. Depending on the home’s overall aesthetic, a few different styles of bay windows can complement any property.

  • Victorian bay window. Victorian bay windows have eye-catching complex and ornate details. This classic canted bay window was popular after the change of building codes in the 1800s that allowed windows to extend beyond the walls of a house.
  • Tudor bay window. Tudor bay windows have wooden brackets that match the exposed wood on the home’s exterior. They’re typically smaller windows that can be found on any level of a Tudor home.
  • Midcentury modern bay window. MCM bay windows have a minimalist and understated look. They’re popular in split-level homes to increase outside views.
  • Modern bay window. These bay windows have narrow frames, more glass, and less ornamental design between the windows to let in more natural light.
  • Craftsman bay window. Popular in Craftsman bungalows for expanding the square footage, these bay windows were intended to add practical space to the living area.

Since bay windows are not just single windows, how they’re installed depends on the configuration. Homeowners interested in the maximum amount of light may opt for three picture windows of the same size. Those who want their bay windows to open can choose a picture window with casement or double-hung windows on each side. Casement windows open with a crank, and double-hung windows can open from the bottom, top, or both for more air circulation.


Bay window cost depends on the manufacturer and the options it offers. Many brands have bay windows that are of different sizes, made from differing materials, and have distinct qualities. Some have bay windows in multiple lines with specific materials and styles, such as Andersen, Pella, and Simonton. Other manufacturers, such as Alside, have a more limited selection, and a few brands are available only in certain locations in the country, such as Harvey, which is only available in the New England area. Each brand has its own pricing depending on style, material, size, and installation.

Type of Material

Bay windows can be made from a variety of materials. The material affects the price, style, durability, functionality, and level of maintenance.

  • Aluminum. Prices for aluminum bay windows can range from $360 to $2,050 or more. Durable and lightweight, aluminum bay windows are well suited for homes in warm climates. This mid-grade material does not insulate as well as other materials, but it is deterioration resistant.
  • Fiberglass. The cost to install fiberglass bay windows runs from $750 to $3,500. This medium is likely to be the most expensive of bay window materials. It doesn’t contract due to humidity, and it’s very durable. Fiberglass is one of the strongest window materials, and a large bay window will not need extra support. It’s low maintenance, energy efficient, and long lasting.
  • Vinyl. Typically the most budget-friendly material, vinyl usually costs between $570 and $1,750. Vinyl is weather resistant, durable, and low maintenance. Vinyl windows are usually premade, but there is some freedom for customization. It’s one of the most common materials for bay windows, although vinyl can warp in hot weather.
  • Wood. The cost of wood bay windows ranges from $880 to $2,260. Wood expands and contracts based on the temperature and humidity levels. This high-quality material requires more maintenance than other types of windows. Wooden bay windows are available in standard sizes and they can be custom made to fit any space.

Bay Roof Addition

Sometimes the existing roof of the house will extend over a bay window to protect and cover the window. If this isn’t an option, a bay roof addition will be needed. Some homeowners prefer to use the same material that is found on the roof of the house to maintain continuity, and others will opt for new material to create visual interest and drama. Some popular material options are shingles and metals, such as copper. The cost of these materials, not including installation and labor, is between $3 and $15 per square foot for shingles, $4 to $20 per square foot for metal, and $11 to $30 per square foot for copper.

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Labor, Permits, and Fees

The labor cost for replacing bay windows usually runs between $100 and $300. Labor prices can vary if the installation requires custom-fit windows or the window architecture necessary to match a historic home. The labor required to install new bay windows requires more work to the house’s structure, making it more expensive. Simple installation can cost around $300 and can range upward to $2,200 for complex jobs. Depending on the size of the window, material, and customization, the average range for labor is between $400 and $1,000.

Some contractors may add delivery fees to their overall cost if the installation location is some distance away from their business. It’s recommended for homeowners to talk with the contractor regarding any delivery fees.

A permit is usually required if a homeowner makes exterior changes to a home. Be sure to double check local regulations before starting the project. Some contractors will take care of requesting the permit and add the fee to the project’s cost. Others will leave that responsibility to the homeowner.

Bay Window Cost
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Additional Costs and Considerations

When budgeting for bay window costs, it’s beneficial to know all about any additional costs and considerations. These can include structural work, insulation, waterproofing, energy-efficient glass, interior design, cleanup, and waste disposal.

Structural Work

The condition of the wall where the bay window will be installed directly impacts the window’s performance. Sometimes, structural issues are not apparent until the old window is removed and the contractor gets a good look inside the wall. Repairs need to be completed before a new window can be installed, which can drive up the project’s cost. Some walls can be opened up with no issues for a new bay window installation, but load-bearing walls and studs may need to be moved. The price range to open up a load-bearing wall runs from $500 to $3,000, depending on the location and the project’s overall scope. Repairing drywall, trim, and siding can also increase bay window installation cost by $300 to $1,000 or more.

Insulation and Waterproofing

Weatherproofing and insulation requires the positioning of insulation in the spaces around the window. This can cost an additional $450 to $3,000. It’s also important for homeowners to ensure that replacement windows or new window installations are waterproof. Leaky windows can lead to water damage and mold growth.

Energy-Efficient Glass

Some homeowners in colder climates opt for energy-efficient, triple-insulated glass that has a Low-E coating for their windows. While these types of windows increase energy efficiency by 15 to 25 percent and can save money down the line, the up front costs run from $1,100 to $3,680.

Interior Design

Additional materials to finish the interior space are typically not included in the estimate to install a bay window. Interior trim includes framing the window and the option of including a seating or storage area. A carpenter is usually hired to complete this phase of the job, with many homeowners paying between $550 and $1,100 for a window seat and new trim.

Cleanup and Waste Disposal

Some contractors include cleanup and disposal fees in their labor prices and others may add it as a separate charge. Construction cleanup averages about $450.

Types of Bay Windows

All types of bay windows have different functions and appearances. They come in different shapes, sizes, and designs. Different types of bay windows work better if installed on the ground floor rather than an upper floor, and each will boost the appearance of the exterior differently. Here are the different types of bay windows and their average prices.

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Bow windows don’t protrude as far away from the wall of a house as much as a bay window. A bow window usually has between four and six glass panels that are set at a wider angle than the ones in a bay window. Incorporating additional glass panels provides a gentle curve to the window. Bow windows can cost 1.5 to 2.5 times more than a bay window, and new bow windows typically run between $3,000 to $10,000 per window.

Box Bay

Box bay windows look like half of a box, with three glass panes at 90-degree angles. This type of bay window is usually small, typically 3 by 3 feet or 4 by 4 feet. They’re commonly found in kitchens and are cheaper to install than other types of bay windows. This popular style needs to be custom fit, and they cost between $500 to $900 for materials.

Circle Bay

This high-end bay window option has larger panes of glass that are fully curved to create a half-circle. They usually have ornamental details and intricate designs. The cost of a circle bay window is between $2,000 and $3,000.

Full Bay

Full bay windows are larger than box bay windows since they’re wider and taller. Also known as a canted window, it has three panes of glass: the middle one is flat and the other two are angled at either 30 or 45 degrees. Full bay windows are only installed on the first floor of a home and they can cost between $800 and $2,100 for materials.


First popularized during the Renaissance era, this type of window is the oldest bay window style. Oriel windows are built into the side of a home and can be installed on any level. Structural support is supplied with a decorative corbel or bracket under the window. The cost of materials for an oriel bay window averages $900 to $2,500.

Bay Window Cost
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Benefits of Choosing a Bay Window

The earliest bay windows were ornamental, but over the years, people realized that this style of window has many benefits, including letting in more natural light. They also add visual appeal and improve airflow while adding additional seating or storage space.

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Increased Property Value

Bay windows typically increase a home’s value due to the augmentation of square footage. The overall curb appeal of a home is given a boost by the decorative exterior design and expanded room size. New window prices can usually be recovered up to 73 percent when it’s time to sell a house.

Increased Natural Light and Room Size

With multiple panes of glass, bay windows let in more natural light than a standard window. They provide a fantastic view of the outside and dramatically increase natural light from different angles. The interior of a room can feel more open and welcoming with a bay window. They increase the room size and add room for storage or extra seating.

Improved View

Bay windows furnish less obstructed views and provide views from different angles. Bay windows maximize the view to the outside, resulting in a panoramic field of vision.

Additional Seating

Bay windows are functional home additions since they provide space for additional seating in the form of benches. Many homeowners use these areas for a comfortable reading space or for seats for a dining table.

DIY vs. Hiring a Professional 

Whether a homeowner is planning to replace a bay window or install a new one, hiring a professional is best. These large windows need to be replaced by an experienced professional who has expert tools and equipment. They know how to measure the space correctly and can weatherproof and install the window so it will last. A pro will also know how to remedy structural damage, handle mold and mildew remediation, and will be familiar with local code requirements. Incorrect installation of a bay window can cause structural damage or cause the window to collapse, which can increase the overall costs exponentially.

How to Save Money

Budgeting for bay window costs can be challenging, and the additional fees associated with the project can quickly add up. One way to save money on bay window cost is to install the cheapest window, but there are other ways to save without compromising what you want.

  • Get more than one quote. Get at least three quotes from reputable window installation companies in your area.
  • Avoid extra features. Opting for window tinting or decorative add-ons can dramatically raise window installation price.
  • Negotiate. Some window installation companies may have room to negotiate installation prices to meet your budget.
  • Install multiple windows. Often the installation price per window will be less if there are multiple windows installed simultaneously. Some companies may offer significant discounts for installing more than two windows at the same time.

Questions to Ask About Bay Window Cost

When hiring a bay window installation company, asking the right questions about bay window costs can minimize miscommunication and save money for homeowners. There are several questions for homeowners to consider asking while vetting pros.

  • Are you insured and licensed?
  • How long have you been in business?
  • Do you provide free estimates?
  • Do you have references?
  • Who will install the bay window?
  • What experience do your technicians have?
  • What type of warranty do you offer?
  • Do you handle interior trim work?
  • How long will the installation take?
  • How do you protect the installation area?
  • Will you clean up and haul away construction materials?
  • What are your payment terms?
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Staying within a budget for bay window costs can be a formidable process. Homeowners will want to consider some frequently asked questions about bay window costs to help guide them in their decisions.

Q.Can you replace a regular window with a bay window?

Yes, you can replace a regular window with a bay window.

Q.Which is cheaper, a bay or bow window?

Bow windows are usually 1.5 to 2.5 times more expensive than a bay window of a similar size. New bow windows can cost between $3,000 and $10,000 per window compared to $1,000 to $7,000 for new bay windows.

Q. Can you add a bay window to a house?

Absolutely. It’s the perfect way to increase curb appeal, let in more natural light, improve the view, and add extra seating and storage.

Q.Do I need planning permission to put in a bay window?

Some areas require a permit to make any external changes to a home. It’s best to double check with your local regulations to see if you need permission to install a bay window to your home.

Q.Do bay windows add square footage?

Yes. Bay windows jut out from the exterior of the house to provide additional square footage and provide more space within a room. This additional square footage also increases the value of the home.

Q. Are bay windows outdated?

Even though they first gained popularity during the Renaissance era, bay windows are still a highly sought-after feature. They provide extra seating and expand the room to make it feel light and airy. Modern window technology makes these windows more energy-efficient and decreases heat loss.

Sources: Angi, HomeAdvisor, Fixr, Thumbtack