Bay UPVC Windows | Double & Triple Glazed Windows

		Design & Price Price		Window/door Info Product Info Info		Advice Centre Advice		Track Order Tracking		Delivery Delivery		Payment Payment		Questions/FENSA Questions FAQ		Installation		About Us About		Contact Us Contact

Made In Britain 30+ years manufacturing

250,000+ Windows & Doors Sold Trusted by homeowners & trade alike

Read our reviews ★ ★ ★ ★ ★

Secure CheckoutPayments processed by Worldpay

Prices starting from only

£199.25

All our prices include VAT

Choose your UPVC bay windows and get an instant price

How to order your UPVC bay windows

Designing and ordering your new, modern bay windows is simple with our easy-to-use online designer tool.

1. Choose Your Bay Style, Size and Window Type

Select your bay shape, enter your size, and choose from casement, flush, tilt & turn or sash windows.

2. Customise and get an instant price

Experiment with frame colour, glazing, handles and other options to find the right fit for your home.

3. Check out and arrange quick delivery

Check out quickly and pay securely. We'll get your windows delivered to you in no time.

What's the difference between a bay window and a bow window?

Bow and bay windows both extend outward, adding light, space and character.

The key differences are:

Bay windows: Usually have three sections made up of a large central window with two angled sides. They sit on an extended base wall that projects outward with the frame.
Bow windows: Consist of four or more equal-sized windows forming a gentle curve. They don't need the base wall to extend, as they're supported by their own frame.

Bay windows come in various shapes:

Square (box) bay - Three windows with square angles
Splay bay - Three angled windows forming a half-hexagon
Circular bay - Five or more windows creating a curved view
Single End bay - Two windows meeting at one angled corner

You can choose from several window styles to fit your bay or bow design, giving you a look that suits your home perfectly. Use our online designer tool to begin customising your design.

Key structural support requirements for bay and bow windows

Bay and bow windows must be properly supported before, during and after installation.

Check ahead: In some properties, especially older homes, the existing window frame may have helped support the wall or roof above, so the opening should always be checked before replacement.

Suitable support options: These may include lintels, structural bay poles, jacking poles or bearing plates, depending on the property.

If the existing support is unclear or inadequate, a professional survey or structural advice should be arranged before installation.

Expert Insight

Why bay windows never go out of style

Bay windows bring light, space and character to any home. Their angled design draws in daylight from multiple directions, making rooms feel brighter, larger and more open.

Whether upgrading a traditional Victorian bay or adding one to a modern property, bay and bow windows can enhance kerb appeal, increase property value and improve everyday enjoyment.

Design your bay window

Paul Corras

Installations Manager

at Modern UPVC Windows

______

Paul oversees installations, bringing practical insight into how windows and doors perform in real homes.

Why choose our bay windows?

Energy efficiency

Our UPVC bay windows keep your home comfortable year-round by reducing heat loss in winter and blocking heat in summer, lowering energy bills. Available in double-glazed or triple-glazed options with argon gas and heat-reflective coating, they improve insulation without altering the overall look of your bay window.

For top performance, choose our A++ triple-glazed option with Pilkington KS glass, offering excellent insulation in a slim, stylish frame, ideal for upgrades or new builds.

A

++ Rating

View certificate

Built to last

Every bay window we make is custom-built to your exact measurements for a perfect fit and finish. We use the trusted Deceuninck 2800 Heritage range, renowned for its strength, durability and elegant design.

Each window is crafted with the same high level of care and precision, and each comes with a 10-year guarantee, ensuring lasting quality and peace of mind.Each window is crafted with the same high level of care and precision, and each comes with a 10-year guarantee, ensuring lasting quality and peace of mind.

Explore more of our windows

30+ years of experience

With more than 30 years in the industry, we are proud to be a trusted UK manufacturer.

Our skill and attention to detail mean every bay window we create meets the highest quality standards.

This dedication has earned us the confidence of thousands of homeowners and tradespeople across the country.

See how we make our windows

Top-level security

Security is essential for your home, which is why our bay windows incorporate robust components tested to PAS24 security standards.

Each window features durable Yale multi-point locking with shootbolt locks, helping to improve resistance against forced entry and provide added peace of mind.

Price match promise

We're committed to giving you great value without cutting corners on quality. Our competitive prices mean you get premium bay windows at an affordable rate. Use our easy online designer tool to create your perfect bay window and get a free instant price.

Plus, to make sure you're always getting the best deal, we offer a price match guarantee. *

*Terms & conditions apply.

Fast delivery and installation options

We offer flexible delivery services across the UK and professional installation throughout the Midlands to fit your needs.

Choose the option that works best for you:

Delivery Only – Your custom-made, modern UPVC bay windows are shipped straight to your door

Expert Installation – Our skilled fitters manage everything, from a pre-installation survey to the removal and recycling of your old windows

Collection – Conveniently pick up your windows from our warehouse whenever it suits you

Precision-welded bay cills

We have invested in specialist CNC welding technology designed specifically for bay window cills.

The advanced machinery measures and adjusts for profile tolerances before welding, helping us create accurate, consistently finished joints. Excess material is removed automatically during the process, producing a clean, flat and virtually seamless appearance without extensive manual finishing.

For you, this means a neater-looking bay window, more consistent manufacturing quality and a cill made precisely to suit your chosen bay configuration.

How to customise your UPVC bow and bay windows

Start by choosing your preferred window style: casement, flush, tilt & turn or sash to perfectly match your home's look and functionality. Then, personalise further with a range of options designed to enhance both style and performance:

Glazing: Choose from our standard ultra-efficient A+ rated double-glazed bay windows or upgrade to A++ triple glazing. Options include toughened, laminated and acoustic safety glass for enhanced durability and performance.

Integral Blinds: Our blinds are sealed safely inside the glass units and available in cordless, dual-sided and corded options for a neat and practical solution.

Handles & Accessories: Select from a variety of handle finishes and hardware to personalise your bay windows to suit your décor.

Obscure Glazing Options: Enhance privacy without sacrificing natural light by choosing from frosted, textured, patterned or decorative obscure glass styles.

Decorative Bars: Add style with Georgian, Astragal or traditional lead bars in multiple configurations to elevate the appearance of your windows.

Window Restrictors: Improve safety by limiting the window opening distance, providing peace of mind for you and your family.

What are the colour options for bay windows?

Choose from a wide selection of bay window colours, including realistic woodgrain finishes and optional dual-colour combinations to match both your interior and exterior style.

Flat White

White Grain

Cream

Chartwell Green

Agate Grey

Anthracite Grey

Anthracite Grey - Matt Smooth

Black - Matt Smooth

Black Grain

English Oak

Irish Oak

Golden Oak

Nut Tree

Rosewood

Bespoke Colours

You can personalise your bay windows in any RAL colour, using advanced spray painting that delivers a durable finish. This is backed by a 10-year guarantee for added peace of mind.

Frequently Asked Questions

How do I measure a bay or bow window?

Bay and bow windows are made of several window sections connected by poles or posts, usually sitting on a welded sill.

Measuring Steps:

Width - Measure each window section from inside, to the centre of any poles. You may need to carefully remove plaster to see edges.
Angles - Measure the angles between window sections using an angle finder.
Height - Measure window height from outside, including any cills. If no cill is needed, measure to the bottom of the frame.
Check - Double-check all measurements before ordering. If unsure, consult a professional.

Notes

90° angles use square corner posts.
135° angles use fixed posts with slightly smaller window widths.
Other angles use adjustable poles, with slightly smaller window widths.
Poles and posts are reinforced except on sash windows (which can be reinforced with extra parts).

Do bay and bow windows need structural support?

Yes, many bay and bow window installations require suitable structural support. This might include:

Lintels
Bay poles
Jacking poles

It could also require other support, depending on the property.

Check the existing structure before installation. This is especially important on older homes or where the original frame may have been load-bearing.

If it's unclear what the support is, arrange a professional survey or seek structural advice before any work begins.

What size bay windows are available?

All our bay windows are made to measure, so you can get the exact size needed for your space. Whether you're looking for a compact bay or a wide panoramic design, simply enter your custom dimensions into our online designer tool to get an instant, accurate price.

Are bay windows energy efficient?

Yes, our bay windows are available in A+ double or A++ triple glazing with argon gas and heat-reflective glass for excellent insulation and lower energy bills.

Can I install bay windows myself?

Yes, we offer both nationwide delivery and collection options for DIY installation.

Do I need planning permission for bay windows?

Usually not if you're replacing an existing bay. For new bays or structural changes, check with your local authority. Find out more about planning permission for doors and windows in the official Planning Portal.

What are the lead times for delivery and installation?

Lead times can vary depending on the product and order volume. For the most accurate and up-to-date information on delivery and installation times, please visit our Delivery page, which is updated regularly.

Design & order your bay windows

Add classic style and advanced performance to your home. Customise your windows, get an instant price and complete your order in minutes!
Have a question? Browse our FAQs visit the Advice Centre for expert tips and inspiration, or contact our friendly team for help.

Design & Price