Transform your home with our
Secondary Glazing
Homeowners choose secondary glazed windows because it’s quiet, warm, secure and/ or because certain property covenants do not permit the installation of PVCu replacement windows. These features and factors are the bedrock of our bespoke secondary glazing system and are the reason why so many homeowners are adopting this method of thermal, acoustic and security glazing upgrade.
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- Family-run for over 35 years
- Made in Britain
- 10 year Guarantee
- Save Energy & Lower Bills
- A-Rated Frames
Premium Secondary Glazing
If security is your priority, secondary glazing offers a unique, additional deterrent to any would-be intruders. Secondary glazing is incredibly difficult to open from the outside and creates a further layer of defence against forced entry. Our frames are made from only the most durable, high-quality aluminium and are securely fixed to resist forcing.
From a sound insulation perspective, secondary glazing offers the most effective levels of noise reduction on today’s market, significantly enhancing a single glazed frame. Our bespoke secondary glazing is manufactured using state-of-the-art machinery to lock-in a tightly sealed frame which reduces noise levels by up to 80%!
If draughty windows are of bigger concern for your property, secondary glazing adds an extra layer of defence to guard your home against heat loss. The small gap between your existing window and the secondary unit effectively acts as an insulator, creating a separate layer of air between the two which can reduce heat loss by up to 65%. The sleek, modern design of our secondary glazing systems ensures that you’re able to enjoy all the acoustic, thermal and security benefits, without having to compromise on style.
Ready to transform your home?
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 Secondary Glazing?
f you’re considering secondary glazing, we’re confident you won’t find a higher-quality product or a more dedicated service anywhere else. Here’s why customers choose us
Safe & Secure
If security is your priority, secondary glazing adds an extra layer of protection. Our durable aluminium frames are securely fixed, making them extremely difficult to open from the outside and providing an effective deterrent against forced entry.
Bespoke Designs
In a range of styles, colours and with a 10-year comprehensive guarantee we’re confident our range of secondary glazing will sympathetically upgrade any property.
Secondary Glazing Gallery
Here's some of our most frequently asked questions...
How much does it cost to install secondary glazing?
Secondary glazing is one of the most cost-effective ways to improve your home’s energy efficiency without the substantial expense of replacing entire window units. Because it involves installing a discreet internal pane rather than structural alterations, the costs are significantly lower than full double-glazing replacements. At Spire Windows, we manufacture our own secondary glazing systems, allowing us to offer bespoke designs that fit most budgets. While the size, style of opening, and glass thickness will affect the final cost, our specialists will help you design a solution that provides premium insulation at an affordable price.
Does secondary glazing improve a property's value?
Yes, especially in heritage or character homes. Secondary glazing is highly valued by buyers because it provides the thermal and acoustic benefits of modern windows while preserving the original charm of period frames. Spire Windows specialises in designer secondary glazing where “unobtrusive appearance” and “daily usability” are key. By creating a warmer, quieter home – reducing external noise by up to 80% – you transform your living environment into a more desirable and valuable space.
Do I need planning permission for secondary glazing?
In almost all cases, no. Secondary glazing is a “reversible” internal improvement, meaning it rarely requires planning permission or building regulations approval. This makes it the ideal, convenient solution for homes in conservation areas or even Grade I and II listed buildings where changing the external windows is prohibited. While it is usually allowed under “permitted development,” Spire Windows always recommends a quick check for listed properties. If any paperwork is required, our experienced team can help guide you through the process.
What is the best type of secondary glazing?
The “best” type of secondary glazing is a high-performance system that is tailored to match your existing window’s function. Whether you have sash windows, casements, or large bays, the goal is a seamless fit that allows for easy cleaning and ventilation. Because we manufacture our own systems, we offer a vast range of styles – including horizontal sliders, vertical sliders, and hinged units. Our secondary glazing features high-performance glass to ensure your home remains a “room for all seasons” – dramatically reducing heat loss in the winter and blocking out street noise year-round.