Transform your home with our
Premium Bow & Bay Windows
Here at Spire Window Systems, we offer high-quality PVCu bow and bay windows at fantastic competitive prices!
Our innovative bay and bow windows from Liniar come in a variety of styles and provide features and benefits that are unmatched in the market today. Liniar’s popular windows have ultra-thin frames which not only improve the field of view, but also the flow of natural light.
Make your house seem bigger and let in the world’s natural beauty when you install a bow or bay window!
Request a quote
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- Family-run for over 35 years
- Made in Britain
- 10 year Guarantee
- Save Energy & Lower Bills
- A-Rated Frames
Bow & Bay Windows
Bay Windows
Bow Windows
A bow window is arc-shaped window and has at least four windows, most of which are casement windows. They offer all of the advantages of bay windows, including extra room, a variety of uses, excellent lighting, a better view, and enhanced property value. Bow windows are a wonderful choice if you want to expand space, improve the view, increase natural lighting, enhance the appearance of your home, or create a space that will be utilised for a particular purpose, such as seating, a room’s accent, or storage.
When you want additional light, to make the space appear larger than a bay window might, and to have variable window pane sizes, bow windows are a better option than bay windows!
Ready to transform your home with our Windows?
Need some inspiration?
Get your inspiration and ideas from Spire customers who have transformed their homes.
Our inspirations portfolio is the perfect taster of all the amazing home improvement choices we have to offer.
Conservatory Case Study
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Patio Doors
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Dura Doors
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Visit our showroom
If you’d like to see our designs up close, you’re always welcome at our Louth showroom.
Located next door to our factory, our showroom features a range of our windows, doors, conservatories, and Thermotec roofing. Feel free to discuss your requirements with our helpful team, or simply enjoy browsing.
"The entire team were totally professional from start to finish. Ultra friendly and comprehensive in their systems. Fitters loved a bacon bun too"
"From start to finish we had outstanding customer service. I can honestly say the best of the best windows and doors I’ve seen from spire windows. I’m not just saying this but the quality of each window is outstanding and the 2 men that fitted Ian and Bernard worked extremely hard to get our windows and doors fitted in 4 days they fitted 10 windows and 2doors front and back. Both men were friendly , honest and polite . If you are thinking of getting new windows ,doors etc I can recommend Spire Windows in Louth"
"Very professional from start to finish. From our first visit and quote to the installation of our windows and door. The timeline was pretty much as quoted and the two installation technicians, Paul and Correy, were very good, professional and respectful of our property. Thank you."
"Excellent service from start to finish. Really tidy workers no mess and very efficient all of them .would certainly recommend this company"
"Had 10 windows and 3 doors fitted by Spire. From the initial meeting with Peter to the installation everything was explained in detail professionally. No hard sell like other companies just a fair price for great quality windows. The installation team were friendly, hard working and tidied up after themselves despite some very challenging weather."
The Spire difference
The 
difference
We treat you like you’re a part of the family. Aggressive selling, false promises, hidden charges? Nope! You don’t get any of that nonsense here. Just open, honest, straightforward and friendly service from a family-run team that truly cares.
Design visit
Once we’ve received your enquiry, we’ll arrange for a surveyor to visit your property. They’ll answer your questions and provide you with a quote.
Technical survey
An experienced surveyor will visit your home to conduct the final checks and take measurements for the manufacturing process.
Bespoke UK manufacture
We create made-to-measure products for your home on-site at our Louth factory. If you’d like to see our factory, why not pay us a visit?
Installation
Our experienced local fitters will complete the installation, minimising disruption to your daily routines.
Aftercare
We’ll provide a follow-up call to ensure you’re 100% satisfied. We also offer a 10-year, in-house guarantee.
Why our Bow & Bay Windows?
If you’re searching for bow & bay windows, we’re confident our product quality and service are unmatched. Here’s what sets us apart
Lower Energy Bills
Our bow and bay windows come with features that can reduce your heating costs and improve the energy efficiency of your house.
Bespoke Designs
Our bow and bay windows can be customised to fit your home’s style. From colours, configurations, sizes to styles, we have something for you.
Bow & Bay Windows Gallery
Here's some of our most frequently asked questions...
How much do uPVC bow or bay windows cost?
The cost of installing new bow or bay windows varies depending on the number of “facets” (sections), the overall projection from the wall, and the structural requirements of the opening. Because a bay window often involves load-bearing poles and specialised joint couplers, the pricing is more bespoke than a standard flat window. At Spire Windows, we manufacture our own high-quality uPVC frames, allowing us to cut out the middleman and offer highly competitive, transparent pricing for these impressive architectural features.
How long will new uPVC bow and bay windows last?
A premium uPVC bow or bay window is built to last upwards of 20 years. Because these windows project outwards, they are more exposed to the elements, making high-quality manufacturing essential. We use reinforced frames and durable weather seals to ensure they remain structurally sound and watertight. Spire Windows has been trading for nearly 40 years, so our bespoke frames have truly stood the test of time. With minimal maintenance, your new window will continue to provide a panoramic view and extra internal space for decades.
How long does it take to install bow and bay windows?
Replacing a bow or bay window is a more technical process than a standard installation, as it often requires bay jacks and structural support to ensure the safety of the brickwork above. While the complexity of the aperture and the ease of access play a role, our team of skilled craftsmen are experts at fitting these styles with minimal disruption. Spire Windows prides itself on a swift and tidy installation process – we even responsibly dispose of all your old frames and glass, leaving your home spotless.
How do I know if my existing bow or bay windows need replacing?
Common signs that your windows need an upgrade include noticeable draughts, condensation between the panes, or difficulty opening the individual sashes. For bow and bay windows specifically, keep an eye out for sagging at the base or dampness on the internal “ceiling” (the top soffit) of the window. By upgrading to Spire Windows’ latest energy-efficient frames, you’ll improve your home’s thermal performance and significantly enhance its kerb appeal, giving your property a grander, more spacious feel.