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Create light-filled rooms in homes with bay windows

Bay windows desigs (1)

The bay window enlarges the room and allows a lot of light to enter and create a comfortable resting area. In the following section, we will give you detailed information about bay windows. Let you know about all the most common types, their advantages and disadvantages, framing materials and glazing windows, and costs.

What is a bay window?

As an enclosed covered porch, a dormer window not only increases the size of the room but allows more light into the room. Bay windows usually have two wings that slope outward.

They have a large finish, so they need to be effectively insulated. According to the Building Energy Code (GEG), the heat transfer coefficient or U-value of a projecting window must not exceed 1.3 W/(m² K). Therefore, it is particularly important to provide modern frames and multiple glazing with adequate thermal insulation for bay windows.

Advantages and disadvantages of bay windows

The bay windows allow a lot of light into the room and provide a good view of the surroundings. However, the cost of glass for bay windows is higher because large window areas must be equipped with adequate insulation.



Internal extensions

Fully glassed bay windows are expensive

Light entering

Insulated glass required

Wide view of the outside


Traditional elegant or modern look


Advantages and Disadvantages of bay Window

Different types of bay windows

Because of their location, bay windows should blend as harmoniously as possible into the house facing. Bay windows are usually fitted with flat casement windows, lattice windows, or windows with false panes.

Box Window

Casement windows have two casement frames, which are combined into a box-like structure. The wings can be opened independently of each other, where the direction of opening depends on the respective design. Casement windows are one of the most traditional window models and are mainly found in older buildings.

lattice window

With mullioned windows, the glass pane is divided into several parts. The rungs are used as connectors between the individual glass parts. In the past, large areas could be glazed in this way. Today, glazing bars are used only as a design element. Because of the complexity of production and the special attention that must be taken to insulate windows, latticed windows are more expensive than other types of convex windows.

 lattice bay window

Fake lattice windows

Fake lattice windows use the look of their real counterparts. The glazing is not subdivided here. Bars can either be installed in the spaces between the panes or placed on top of the glass pane. Since they are not used to stabilize the pane, the strips on such windows can be narrower. This in turn allows more light to enter through the bay window.

Frame and glass for bay windows

Insulation and appearance play a critical role in choosing the framing material for your bay windows. If you have a variety of wood windows on your facade, it is recommended that you also purchase wood bay windows. However, each material has its advantages.

Wood can achieve the best insulation values, but it requires regular maintenance. Plastic is the cheapest option but will discolor over time. Aluminum is the sturdiest but is also expensive. A combination frame made of wood and aluminum or plastic and aluminum is also available for your bay windows. The following factors play an important role in window glazing.

multiple glazing

You must consider these costs for new bay windows

Since convex windows are usually glass and convex windows are usually installed floor to ceiling, it has a higher cost. However, in terms of design, there is no difference from a traditional facade window. In contrast, the following factors play a role.

window size

Window type


Frame material

Opening mechanism





the cost of bay window

In Europe, for example, A single plastic bay window costs between 800 and 3,000 euros, and this price includes the installation

Window type

Costs including installation*

Fake lattice window

Approx. 800 to 2,000 €

Box window

Approx. 1,000 to 2,500 €

Real lattice window

approx. 1,500 to 3,000 €

The installation cost of the bay window

Installation costs account for about 30% of these prices, while the rest will vary with the contractor’s hourly rate and the time required for installation. The former may vary depending on where you live, for example, in Europe, it is usually about 40 to 60 euros per hour for a skilled worker.

Regarding installation time, you should allow two to five hours to install the windows, or about an hour more for work if the old windows must be removed first.

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