How Much Does a Garden Window Cost?

Average Garden Window Cost

Garden windows enhance any home by bringing in natural light, additional space, and a connection to the outdoors. Their unique design makes them a beautiful focal point, but they are also one of the more expensive window types. This guide breaks down the cost factors of garden windows, including pricing by size, frame material, and glass type.

As of 2025, the average cost to install a garden window is approximately $4,100, with most projects ranging between $1,350 and $6,800, including professional installation. The total price depends on quality, brand, and frame material.

The higher end of this range applies to new installations, which require cutting a new wall opening or expanding an existing space. Costs may also rise if the installation involves structural modifications, water damage repairs, or other construction work before replacing or adding the window.

Your final project cost can vary significantly for garden window installation and will depend on a few factors:

• The size of the window.
• Window brand.
• Framing material.
• Type of glass.
• Customizations.
• Any required demolition or construction work.

Factors Affecting Garden Window Cost

Now that you have an idea of average costs, let’s explore what will impact the price of your garden window installation.

Some factors have a greater influence on cost, while others have a smaller impact. Understanding where you can adjust your choices — such as frame material, glass type, or window size — can help you balance quality and budget to find the best option for your home.

Let’s dive into these details in the next few sections.

Garden Window Sizes and Costs

The size of your garden window plays a significant role in its cost. If you’re replacing an existing garden window, then you will likely find it is most cost-effective to keep the size the same. However, if you are installing a new one, then you’ll find a smaller size will have a dramatic impact on saving.

Here’s a breakdown:

What’s the Most Popular Size for Garden Windows?

The most popular or common size for garden windows typically falls within the medium range, with dimensions around 36 inches wide by 36 inches high.

This size offers ample space for plants and decorative items, allows for lots of natural light, and can usually fit in the space above kitchen sinks, which is where garden windows are most frequently installed.

What Else to Know About Sizes

Garden windows are generally smaller than standard double-hung or bay windows, but they still come in a range of sizes to suit different spaces.

Standard garden window sizes start as small as 24 inches x 24 inches and can go up to 72 inches  x 60 inches for larger installations. Many manufacturers also offer custom sizes, allowing you to find the perfect fit for your window opening and home design.

To learn more, you can visit our guide on standard window sizes.

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Garden Window Prices by Frame Material

The choice of material for the frame significantly impacts both the cost as well as your window’s longevity and maintenance needs.

Here’s a look at the average cost range of the five most popular window frame materials:

How to Decide Which Frame Type is Best

Each frame type has benefits and drawbacks. You’ll have to decide which material is the best one for your budget and your home.

• Vinyl: Vinyl frames are one of the most popular choices due to their durability, low maintenance requirements, and affordability. They offer good thermal insulation and come in various colors, though the selection is not as broad as painted wood or fiberglass.
• Wood: Wood frames provide a classic, natural look that many homeowners love. They offer excellent natural insulation and can be stained or painted to match any decor. However, they require regular maintenance to prevent decay, warping, or termite damage.
• Aluminum: Aluminum frames are known for their strength and slim profile, allowing for more glass area. They’re less expensive than wood and fiberglass but offer poor thermal insulation and can condense moisture.
• Composite: Composite frames are made from a mixture of wood fibers and plastic, designed to offer the best qualities of both materials. They are durable, with minimal expansion and contraction, and require less maintenance than wood, while still providing a similar aesthetic.
• Fiberglass: Fiberglass frames are among the most durable and energy-efficient options. They can withstand temperature extremes without warping, cracking, or fading. Fiberglass frames are low maintenance and can be painted, offering a high degree of customization.

You can read more about frame types, explore their costs, and even take our quiz to get our recommendation on which material is your ideal fit by visiting our guide to window frame types.

Cost Increases by Glass Options

The type of glass used in garden windows can affect both the cost and the window’s energy efficiency. Here’s a look at what you can expect to add your project’s bottom line by choosing from various glass options:

What Glass Options Should I Consider?

• Double glazing is the standard for most modern windows, offering a significant improvement over single-glazed windows in terms of insulation and noise reduction. You can read more about double paned windows over at our guide.
• Triple glazing adds an additional glass pane and air space, offering the highest levels of insulation and noise reduction, which is especially beneficial in very cold climates or for homes in noisy areas. Our guide to triple paned windows can tell you more.
• Low-E glass has a microscopically thin coating that reflects thermal radiation. This means it helps keep heat inside during the winter and outside during the summer, making it an energy-efficient choice year-round. We created a guide to understanding low-E glass if you’d like to learn more.
• Gas-filled glass units use inert gases like argon or krypton between the panes instead of air, further reducing heat transfer and improving thermal performance. These gases are denser than air, providing better insulation and energy efficiency.

To get a closer estimate for your window project suited to your home and needs, you can use our free cost calculator tool below.

Window Replacement Cost Calculator

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Remember, the best glass option for your garden window will depend on your specific needs, including climate, orientation of the window (e.g., south-facing windows might benefit more from Low-E glass), and budget. Upgrading the glass can significantly enhance the window’s energy efficiency, potentially leading to savings on heating and cooling costs over time. You can visit our guide to glass types to learn more about all the options above.

The Final Word

When you’re installing or replacing a window, you should choose the window type (like a garden window) first, then the frame, and then the glass. A contractor can help you with all those decisions. If you’re not positive this is the window type you want or aren’t sure it will fit into your budget, then you can learn more by reading our guide to garden windows or you can check out our guide to types of windows to explore your other options.

If you’re ready to get quotes for a garden window, plan to reach out to three or four contractors to find someone with the right experience at the right price. You can use our contractor directory to browse through the pros available near you and connect with them for quotes.

You can also have Modernize do the research for you. Click below and answer a few questions about your project to be matched with up to four pre-vetted professionals.

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