Bay Windows

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How Much Does It Cost to Install or Replace Bay Windows?

Bay windows can spruce up any aspect of the home they are installed in. They are identified as any form of window that extends from the outside of the house while forming a “bay ” inside. Bay windows are typically made in angles of 90, 130, and 150 degrees, and can also include a seat or storage on the interior beneath the glass.

These styles of windows make a stunning display on both the interior and exterior of the home. Given that they offer a greater range of positioning and angles, they make it possible for more light to enter the home, and give you a larger view into the outdoors.

For this discussion, we will consider bay window installation costs, of 4-foot, 8-inches by 4-foot, 6-inches, which average $3,200. However, there are a lot of different types and sizes of these windows, which can have an effect on the installation cost. The size you want, the angle at which it protrudes, whether you include a seat, the material it is made from, and whether or not this is bay window replacement or new construction can all impact the final cost as well.


Bay windows extend outward from the house, which in turn means that they need additional support. When considering the location for your bay window, you have to look not only at precisely where you want it cosmetically but also where it will fit functionally. The area you mount your bay window in needs to have an eave or an overhang from the roof right above it. If you do not have this eave currently there, it will have to be constructed, which may drastically increase costs of the final installation cost, by as much as $2000.

The size of the eave will dictate what angle your window can protrude to. An eave measuring 12-14 inches can uphold a 30-degree bay, while an eave that is 16-22 inches can support a 45-degree bay; something larger will involve an eave at least 18-24 inches deep.

For cosmetic reasons, you’ ‘ll prefer to pick a place that provides the most ideal views, not only from the interior as you sit and read the paper on the ledge but also from the outside. A bay window can significantly enhance the curb appeal of your home, therefore you ”ll need to make sure that they can be observed from the street. Common rooms to add them to include:

  • Living rooms
  • Bedrooms
  • Dens
  • Libraries
  • Family rooms

Types of Bay Windows

While it ‘s become commonplace to refer to any sort of window that curves or expands outward from the house a “bay ” there are actually different kinds:

Bow window

A bow window is three or more windows that curve outward from the house in a smooth line. A bow window may or may not include any seat or ledge below them, and there is normally space or support between each of the windows. This kind of window can be installed in more places than a conventional bay given that bow windows require less support. Bow windows will cost between $1,500 and $3,500.

Box Bay window

A box bay window extends outward like a traditional bow or box but doesn’t curve or create an angle to do this. Instead, a “box ” or square addition is put onto the home with three non-curved windows installed in a straight line at the front. A box bay extends the space of the room a little, and will typically have its own roof or eave installed directly above it. Expect to pay around $2,500 to $3,200 for a box bay window

Full Bay window

A full bay window involves three or more windows that extend outward, usually with a ledge or seat indoors. The windows on the side are typically set at an angle to the center window, which in turn is installed alongside the house. Full bay windows don ” t increase living space , but do offer you more use of the window area by featuring a seat or storage. Presume to pay $1,200 to $3,000 for a typical full bay.


The type of material your bay window is made from can affect its cost, its look, and its durability. There are four basic materials that are used for bay window construction:

Vinyl 3: Vinyl 3 is definitly the least expensive material for bay windows which makes it a preferred selection for many homeowners. Vinyl is also significantly low maintenance , requiring no scraping, painting, or other work, but the interior and exterior frame is constructed from vinyl, which is not as cosmetically satisfying as some other materials. Vinyl is not a great insulator, so cold weather conditions may require additional insulation around the frame as well. Typical costs for a window measuring 4-feet, 8-inches by 4-feet, 6-inches are around $1,200.

Wood: Wood is regularly a attractive choice for bay window frames for its aesthetic appeal and adaptability. You will be able to have custom-made windows built in wood of any shape and size, and you can paint or stain the frames to fit the rest of your decorations. Wood is a better insulator than vinyl, but it does involve a lot of maintenance including painting, scraping, and caulking regularly. Wood is generally mid-range in price, costing more than vinyl. Typical costs for a window measuring 4-feet, 8-inches by 4-feet, 6-inches are around $2,100.

Fiberglass: Fiberglass is one of the latest materials for window frames. It ‘s significantly durable, extremely versatile, low maintenance, and a very good insulator. It is available in more options than vinyl 3, and some types may be painted for a even more custom look. This is the most costly selection for window frames, and it may not be available in every size window. Typical costs for a bay window measuring 4-feet, 8-inches by 4-feet, 6-inches are around $3,200.

Aluminum: Aluminum is also a popular choice for windows, as it can help enhance the worth of your home once installed. Aluminum is low maintenance, long lasting, a great insulator, and can be found in a vast array of sizes. Colors and designs may be more limited, however, than with wood or fiberglass 5. Aluminum is usually mid-range in pricing. Typical costs for a window measuring 4-feet, 8-inches by 4-feet, 6-inches are around $2,400.

Labor: Most window installers can make the required arrangements to install a bay window in your home. Depending on the existing location, labor may be as quick as switching the windows, or as complicated as cutting and reframing the walls of your home and building a new roof over the area. If you are also incorporating eaves or a roof to the spot above the window, you may have to hire a roofer to complete the area as well. Expect to pay $500 to $700 for window installation if you have an existing bay or bow window you are switching out, and $1100 to $2100 for installation if this is a new bay, that calls for support, framing, and finish work to complete. If you need to hire a roofer to finish the job, look to to pay $40 to $70 an hour for the work.

New Installation vs. Replacement

Replacement bay window prices vary. While you can transform any existing window into a bay, bear in mind that the more work that will need to be completed, the higher the final cost. Replacing an existing bay for a more recent version with better-insulated glass and frame will be the lowest cost and labor while building out a new box window and roof will definitely be the most costly. Anticipate new installation to take 2 or 3 days to complete; replacements can generally be performed in 4 to 6 hours.

Enhancement and Improvement costs

Removal, Disposal, and Cleanup

Depending on the magnitude of the project, you may have to factor in the clearing of old windows, construction debris, and clean-up of the property. For a lot of replacement window jobs, this is included in the cost of bay window installation. For bigger jobs, for example, the opening of a wall and the building out of a box, you may have to pay out more removal and disposal fees of $200 or more. Consult your installer to determine what can be included.

Opening up of a wall

If you are switching over a singular window to a bay, keep in mind that more substantial construction may be necessary for your home. This will consist of identifying studs and load bearing walls, relocating these if needed, and opening the existing wall to make way for the new window. Your home could be open to the elements for one to two days during this time, however plastic sheeting may be utilized to cover the area until the new one is installed. This type of job can increase costs by $500 to $1500.

Energy Efficient Glass

If you reside in a cold climate, you may need to look at triple insulated glass with a low-E coating to help boost the energy efficiency of your home by 15 to 25%. Most are available with this option, at an additional cost of 25 to 30% – or between $300 and $600 more.

Interior Trimming

If you do not currently have an existing bay window you are changing out, you might just wish to trim and finish out the interior to complete the look. This includes things like building a window seat or storage bench, adding window frames, or ledges. You may have to hire a carpenter to complete this work at a cost of $70 an hour, or $840 to $1680 to build a window seat.