Last Updated on February 21, 2025

Bay windows are a stunning addition to any home, providing increased natural light, expansive views, and an elegant design that adds character to both modern and traditional properties. 

If you’re considering installing bay windows in your home, it’s important to understand the costs involved. In this guide, we will break down everything you need to know about bay window prices, helping you get a clear picture of the cost of bay windows in the UK.

What is the Average Cost of Bay Windows?

The average cost of bay windows can fluctuate depending on a variety of factors, all of which contribute to the overall price. These factors primarily include the material of the frame, the type of glazing, and the design or shape of the window.

Frame Materials

The material used for the window frame plays a significant role in determining the bay window installation cost. Common frame materials include:

Timber (Wooden Frames)

A traditional choice that offers classic beauty and excellent insulation properties. However, wooden frames tend to come at a higher price due to the natural material and the maintenance required.

uPVC (Unplasticized Polyvinyl Chloride)

This low-maintenance material is a popular option in modern homes. uPVC frames offer great insulation and security and tend to be more affordable than timber. They are also durable and can last for many years, making them an attractive option for budget-conscious homeowners.

Aluminium

Known for its strength, longevity, and sleek appearance, aluminium frames offer a modern, industrial look. While typically more expensive than uPVC, aluminium windows offer excellent durability and energy efficiency.

Pricing Table for Bay Window Frames by Material and Size

Frame Material	Number of Sections	Dimensions (L x H)	Price Range
Timber (Wooden Frames)	3 Sections	1500mm x 1200mm	£2,500 – £3,200
	4 Sections	1800mm x 1200mm	£2,800 – £3,500
	5 Sections	2100mm x 1200mm	£3,200 – £3,800
uPVC	3 Sections	1500mm x 1200mm	£1,190 – £1,500
	4 Sections	1800mm x 1200mm	£1,500 – £1,800
	5 Sections	2100mm x 1200mm	£1,800 – £2,100
Aluminium	3 Sections	1500mm x 1200mm	£1,800 – £2,200
	4 Sections	1800mm x 1200mm	£2,200 – £2,600
	5 Sections	2100mm x 1200mm	£2,600 – £3,000

Glazing Options

The type of glazing you choose for your bay window will significantly impact both the bay window replacement cost and its performance. There are several types to consider:

Double Glazing

The most common choice, offering improved thermal insulation, noise reduction, and energy efficiency. Double glazing is often used in bay window double glazing installations, as it enhances comfort and reduces energy bills.

Triple Glazing

A step up from double glazing, triple glazing offers even better insulation and soundproofing. However, it can increase the cost of your bay window installation due to the extra material and labor involved.

Secondary Glazing

A more affordable alternative to double or triple glazing, secondary glazing adds an additional pane of glass to your existing window. It’s not as effective as double glazing but can still provide improved insulation and soundproofing.

Pricing Table for Glazing Options by Window Size and Section

Number of Sections	Dimensions (L x H)	Double Glazing Cost	Secondary Glazing Cost	Triple Glazing Cost
3 Sections	1500mm x 1200mm	£250 – £350	£150 – £250	£350 – £500
4 Sections	1800mm x 1200mm	£300 – £400	£200 – £300	£400 – £600
5 Sections	2100mm x 1200mm	£350 – £500	£250 – £350	£500 – £700

Bay Window Shape and Design – Prices

When it comes to choosing bay windows, the shape and design of the window can have a significant influence on the overall bay window replacement cost. 

In addition to frame material and glazing options, the shape of the window can affect the labor involved, the amount of material needed, and the complexity of installation. 

Below are the most common bay window shapes and their potential cost implications:

Canted Bay Window

This is one of the most popular designs, featuring three or more windows arranged at angles to each other. The design provides excellent panoramic views and allows for plenty of natural light to enter the room. 

The canted bay window is a stylish choice that can enhance the visual appeal of your home. As this type of bay window typically requires angled frames, installation may involve more detailed craftsmanship. 

Expect to pay between £1,190 – £2,700 for a canted bay window, depending on size and materials.

Box Bay Window

Often referred to as square bay windows, box bay windows project outward from the building, creating a rectangular or square space. This design is versatile and works well in living rooms or bedrooms. 

Box bay windows can be designed with a flat or splayed front, offering flexibility in how they blend with the existing architecture. 

The cost for a box bay window typically ranges from £1,690 – £3,200, with additional costs possibly incurred from building regulations or planning permissions.

Oriel Bay Window

Located typically on the upper floors of buildings, oriel bay windows project outward and are often supported by decorative brackets or corbels. This window style is known for its charming look and ability to add space and light to upper rooms. 

Due to the custom nature of oriel bay windows, the price can range from £1,690 – £3,200, but additional features such as decorative glazing or custom finishes can increase the cost.

Circle Bay Window

This unique, curved bay window style provides a full circular shape and is ideal for those seeking a more dramatic and panoramic view. Circle bay windows are often larger and more complex, which can drive up the price. 

On average, a circle bay window can cost between £2,190 – £4,700, though the price will increase for larger or more intricate designs.

Pricing Table for Bay Window Shapes

Bay Window Shape	Price Range
Canted Bay Window	£1,190 – £2,700
Box Bay Window	£1,690 – £3,200
Oriel Bay Window	£1,690 – £3,200
Circle Bay Window	£2,190 – £4,700

Are Bay Windows Worth It?

For homeowners and landlords in the UK, the question of whether bay windows are worth the investment comes down to several key factors: aesthetic appeal, property value, energy efficiency, and suitability for different types of homes. 

Here’s what you need to consider when deciding if a bay window is the right choice for your property.

Do Bay Windows Add Value to a Property?

Yes, bay windows can add significant value to a home. They create a feeling of spaciousness, allow for more natural light, and enhance the kerb appeal of a property. 

Homes with bay windows often appear larger and more inviting, which can make them more attractive to potential buyers or tenants.

Which Homes Are Best Suited to Bay Windows?

While bay windows are a beautiful addition to most properties, they work particularly well in:

• Victorian & Edwardian Homes – Many period homes already feature bay windows, making them a perfect choice for renovations or replacements.
• Semi-Detached & Terraced Houses – Adding a bay window to the front or side of the house can increase interior space and let in more natural light.
• Detached Homes – For homeowners looking to create a stunning visual feature, bay windows add character and boost curb appeal.
• New-Builds & Extensions – Even modern homes can benefit from bay windows, particularly in open-plan living spaces, kitchens, or home offices.

Energy Efficiency & Practical Benefits

With double or triple glazing, modern bay windows offer excellent insulation, helping to reduce heat loss and lower energy bills. Additionally, the extended window structure allows for better ventilation, making them ideal for improving airflow in stuffy rooms.

Request a Free Quote for Your New Bay Windows!

Ready to upgrade your home with stunning new bay windows? Whether you’re replacing old windows or installing brand-new ones, Eco Happy can help you find the perfect solution for your home. 

Request a free quote today and take the first step towards enhancing your home’s aesthetic and energy efficiency with high-quality bay windows.

Simply Contact Us for a free quote, and one of our experts will be happy to provide a competitive, no-obligation quote tailored to your specific needs.

FAQs

Why are bay windows expensive?

Bay windows cost more due to their larger size, complex design, and structural requirements. They require more materials, labour, and support than standard windows. Factors like glazing type, frame material, and custom features also impact the price.

Can I install a bay window?

Yes, but it’s best left to professionals. Installing a bay window requires structural modifications, reinforcement, and possibly planning permission. If replacing an existing bay window, the process is easier, but new installations need expert fitting.

Are bay windows more expensive than regular windows?

Yes, bay windows are significantly more expensive than regular windows due to their multi-panel design and structural complexity. A standard window may cost £300–£600, while bay windows start at £1,200+, with premium options exceeding £5,000.