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Bow & Bay UPVC Windows
An important factor to consider is the energy efficiency of your new upvc bay windows. House of Windows made to measure upvc bay windows are renowned for their ability to keep heat inside the home during the winter and outside during the summer. It’s a winning combination that can help lower your energy bills and make your home more comfortable year-round. House of Windows A and A+ WER rated upvc windows achieve a U value of just 1.3 and our A++ triple glazed windows just 0.9, offering incredible thermal performance.
Style your bay or bow windows to your home, personality or both! Choose from 12 beautiful colour finishes - from standard White upvc to traditional woodgrain effects including Rosewood, Golden Oak, Irish Oak, White Grain or Cream. There’s also the ever-popular shades of grey including Anthracite Grey, Agate Grey and Smooth Anthracite Grey also known as Gale Grey. If you’re looking for a quaint, cottage vibe, Chartwell Green, Black-Brown and Smooth Cream are perfectly matched options. All upvc standard casement and flush window colours are available both sides or coloured externally and white inside.
How Much Do Bay Windows Cost?
You'll want to think about the cost of the bay windows. Price can vary depending on the size, style, window profile colour and energy efficiency of the windows. We’re confident at House of Windows that you won’t find a bay window supply only price to rival us.
Fundamentally, purchasing upvc windows is a super-smart decision for any homeowner. They offer a unique sense of style, functionality, increase natural daylight and improve energy efficiency. And with a 10-year product guarantee, you can rest assured that the investment you make is a truly beneficial for both you and your home.
Are Bay Windows Load Bearing?
It’s always a good idea to assume that a bay window is load bearing unless it can be proved otherwise. Bay windows are supported by structural mullions, ordinarily stone or brick and therefore it’s crucial that the support is sufficient to bare the imposed weight of both the frame, bay poles and glazing. House of Windows offer optional bay jacks if required.
That said, bay windows that have a small felt roof (usually felted), are ordinarily considered non-load bearing.
Need help measuring? Check out our handy How To Measure A Bay Window Guide
House of Windows offer a range of bespoke 2-sided to 8-sided bay and bow windows. Below is an example of some popular bay window layouts.
3 Sided Bay Window
From £795 inc. VAT
4 Sided Bay Window
From £1045 inc. VAT
5 Sided Bay Window
From £1295 inc. VAT
Bow or Bay – Which is Right For Your Home?
Choices… Choices… If you’re wondering which style to choose, ultimately, it comes down to personal taste, the style of your home and the aesthetic you’re hoping to achieve.
Bow windows have a softer appeal due to their curvature and suit both traditional and modern homes. They can let in a great deal more light due to the increased number of glazed panes - if you’re looking for a room with a view, they’re an ideal window solution.
On the other hand, bay windows have a more traditional, angular feel that suits period style properties or a more classic style of home. The alcove a bay window creates, offers the perfect reading nook where you can while away the hours. It also offers a clever storage space solution where you can hide bedding, pillows or even the kid’s toys!
Bay vs Bow Windows
Whether your home is modern or traditional in design, Big, Bold, Beautiful Bay Windows allow you to maximise space and help to flood your home with natural light. Discover how House of Windows can help you make the most of this stunning feat of architecture in your home!
Find answers here to the most asked questions about bay and bow windows.
The main difference between a bay window and a bow window is the shape and angle of the projection.
Bay windows usually consist of three sections and project outward at more defined angles, commonly around 30–45 degrees, creating a strong, angular appearance.
Bow windows typically feature four or more window sections of equal size set at much shallower angles (often around 10–15 degrees), forming a smoother, curved shape across the front of the property.
Both bay and bow windows can include a combination of fixed and opening windows, allowing you to balance views, ventilation and style.
Bay windows add character, boost kerb appeal and can make a room feel brighter and more spacious. Because the window projects outward, it can create a little extra usable space inside and improves the overall sense of light and openness.
Bay windows are ideal for:
- Creating a cosy reading nook or window seat.
- Opening up a kitchen for a sunny breakfast area.
- Adding depth and light to living rooms, bedrooms or a home office.
- Improving airflow, as side-opening casements can catch breezes from different directions.
Yes — you can change a casement window to a bay window. Because a bay projects outward, it normally requires structural support and, in many cases, minor building work.
Converting a flat casement window into a bay window is a popular way to transform the feel of a room without building a full extension.
Bay windows are supported by structural elements (often mullions and bay poles), so it’s important the support is sufficient to carry the weight of the frame, glazing and any structure above.
Depending on the project, support may include:
- Lintels: if the new bay is wider than the existing opening, a new RSJ (steel beam) or concrete lintel may be required to support brickwork above.
- Bay poles / bay jacks: modern bays can be heavy, so load-bearing bay poles and internal bay jacks may be needed to transfer weight down to the cill. House of Windows offer optional bay jacks if required.
- Foundations: for full-height bays down to floor level with brickwork, a concrete foundation may be needed to support the structure.
Bay and bow windows offer lots of flexibility. A classic bay often uses a large centre picture window with two smaller side windows, frequently with opening casements to improve ventilation.
Bow windows usually use four to six sections for a more continuous curve. You can mix fixed and opening sections, or include top-lights for a consistent look.
For the finishing touch, glazing designs such as Georgian bars, Astragal bars or diamond lead can enhance character and help match existing windows and doors.
The cost of a bay window depends on your chosen size, configuration, colour and specification. House of Windows focuses on delivering outstanding supply-only value, with every window backed by a comprehensive 10-year guarantee.
Whether you’re choosing a classic white finish or a woodgrain effect, you can configure a bay window to suit your property and budget.
Whether planning permission is required depends on factors such as location (front vs side/rear), size and permitted development rights.
As a general guide:
- New front-facing bay windows often require planning permission.
- Replacing an existing bay window often doesn’t require approval (subject to local rules).
- Building Regulations apply to ensure safety and energy efficiency.
For peace of mind, consult your Local Planning Authority (LPA). If you’re unsure, you may wish to apply for a Lawful Development Certificate (LDC) or planning permission before work starts.
Need help measuring? Check out our ‘How to measure a bay window’ guide: https://www.houseofwindows.co.uk/measuring.php#baywindow
Call us now on 01530 515161 for a upvc bay window cost and details of our full range of frame colours and bay window types.
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