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Bay Window Prices & Cost for Installation & Replacement

Bay window prices in this guide include window costs plus the cost of installation. The price of bay windows varies based on the window frame material, size and configuration of the window and the features that are chosen. The detailed bay window prices in the table below make it easy to compare costs by checking out our guides to Bow Windows, Double-hung Windows, Casement Windows and other popular window types.

Bay Window Features and Options

What is a bay window? This is a window grouping that extends outward from the house, often with a three-sided design featuring two angled side windows and a center window, often a picture window, that is parallel to the house. Designs with more windows are possible, though the degree of angle is typically 30 degrees of a more dramatic 45 degrees. Bay windows called box bays have 90-degree side windows.

Bay windows can be assembled from many combinations of fixed and functional windows such as casement or double-hung windows for ventilation. The bay can be constructed from a group of windows that are installed separately too, but in this guide, we are discussing bay window assemblies that are installed as a unit.

All the national window manufacturers – Pella, Marvin, Andersen and others – make bay windows in various materials and series ranging from basic to better to best quality.

Your buying options are pre-made bay windows or custom bay windows made to order:

A few Standard bay windows are built in a limited range of combinations, styles and features. Few home improvement stores stock bay windows due to their size, so even standard bay windows that are pre-made and stocked in a factory or warehouse must be ordered.

Custom bay windows, which is the majority of those produced, aren’t manufactured until you order them in the size, material, style, glass/glazing and accessories features you prefer. Average time to complete them once they’re ordered is six to ten weeks. Options include:

  • Materials – Window frames are built from vinyl ($-$$$), wood composite ($$-$$$), fiberglass ($$-$$$) several species of wood ($$-$$$$) and wood with aluminum-clad or vinyl-clad exteriors ($$-$$$$).
  • Color and Finish – Vinyl and fiberglass are available in a handful of frame colors; there are many choices in wood finish and in the cladding that protects some wood window exteriors from the elements.
  • Locks and hardware – Several vinyl and powder-coat finish and a range of metal finishes are available depending on the window series.
  • Glass, Grilles and Screens – Glass, aka glazing, comes in single, double and triple panes, energy efficient glass made for various climates. Light-dividing grilles come in many styles too, and some window series offer a few screen options.

Custom windows can be made in nearly any size at all, but most use windows in these ranges:

  • Side windows: Width – 23” to 38” / Height – 35” to 72”
  • Fixed windows: Width – 24” to 60” / Height – 35” to 72”

The total width of bay window assemblies ranges from about 66” to 130”.

Pros and Cons of Bay Windows

A well-designed bay window is a dramatic addition, and it opens the room to the beauty of the landscape outdoors. With many windows and window features to choose for your assembly, it is possible to customize the design to be exactly what you want.

The disadvantage of a bay window is the cost, especially for custom bay windows made with premium materials. Installation is costly too, as the next section shows. Secondly, if insulated glass is not used, heat loss or gain can lead to higher energy use and costs.

Bay Window Prices for 2019/2020

Bay window prices and costs vary depending on the shape, size, location and material used for the bay window in question. In general, bay windows cost between $950 and $2950 for standard vinyl windows, up to $5,100 for custom wood bay windows. Brands such as Pella

Bay Window Prices and Costs
Window Type Unit Price (Supply Only) Unit Price (Including Installation)
Standard Vinyl $600-$1,850 $950-$2,950
Custom Vinyl $775-$2,100 $1,250-$3,350
Custom Composite $1,050-$2,400 $1,400-$3,600
Custom Fiberglass $225-$1,500 $375-$2,000
Standard Wood $825-$2,650 $1,125-$2,800
Custom Wood $1,100-$4,000 $1,450-$5,100

The Advantages Of Bay Replacement Windows

As we’ve previously mentioned, all windows have their disadvantages and advantages, bay windows are no different. The following are advantages of the bay window installation:

  • Add space to the home
  • Add value to the home
  • Provide good ventilation and natural light

Add Space To The Home

Bay windows are installed in an outward protruding shape, this means that the floor space of the room they’re installed within, increases by up to 3 feet in length. This ads a great feeling of additional space to the room and allows for extra storage. Bay windows are also quite aesthetically pleasing to look at from inside and outside the home.

Add Value To Your Home

As mentioned above, bay windows are attractive to look at, they offer extra space and they add light into your room, these positives alone add value to your home when you come to sell it.

Provide Good Ventilation & Light

Bay windows, owing to their overall size, allow large amounts of natural light into the space within which they’re installed. Where the bay installation has side openers and top openers to it they also allow good ventilation into the room.

The Disadvantages Of Bay Replacement Windows

Whilst bay windows are brilliant windows to add value and light to your home, they also have their disadvantages:

  • Provide an avenue for natural light
  • Can lead to structural issues

Provide An Avenue For Natural Light

Allowing natural light into the home is an advantage, however if you don’t have the right energy efficiency glass protection against solar heat gain (SHG) then this can also cause problems, particularly where the bay installed is large. Whilst the addition of energy-efficient glass can be more expensive, it’s more beneficial in the long run, both in the summer months and the winter months.

Can Lead To Structural Issues

When bay windows are installed, it’s essential that the structure above them is well supported throughout the entire process, this is usually achieved with the use of 2 or more steel supports. It’s also paramount that the right bay windows are installed for the structure, since some bay windows are load bearing and you will need to make sure the bays installed have load bearing strength. Failure to ensure that the above two things are achieved can lead to serious building damage or in worse cases, collapse.

 Factors that Affect Bay Window Cost

Apart from the window size, window combination, the frame material and the accessories you choose, there are two things that will impact your bay window price.

The first is when you buy the window and have it installed. Window manufacturers and sellers offer better discounts in early spring and late fall in cold climates and often during winter in climates where windows can be installed all year. Also, when installers aren’t as busy, such as during the seasons mentioned, they are likely to give more competitive estimates.

The second factor in bay window price is who installs your window assembly. A handyman service will cost the least, but if the job isn’t done properly or the company isn’t licensed and insured, it might cost you more in the end if the job isn’t done properly. The best strategy to get both quality installation and value is to request estimates from several licensed window installers in your area. Let them know you are getting multiple estimates, and if they want the work, they will make their bids are reasonable as possible.