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Secondary Glazing
Stylish, Energy-Efficient Window Solutions
Secondary Glazing
Secondary glazing is a discreet yet powerful solution to improve insulation and noise reduction in listed buildings or properties where primary window replacement isn’t possible. It offers an effective way to enhance performance without altering the original fabric of the building—making it ideal for heritage sites and conservation areas. This method involves installing a second, internal window pane behind the existing window. It creates an insulating air gap that helps reduce heat loss, draughts, and condensation. As a non-intrusive upgrade, secondary double glazing is widely approved by planning officers and heritage bodies for use in sensitive locations. Our systems are slim, attractive, and tailored to blend with traditional or contemporary interiors. Whether you're working on a museum in Oxford, a period townhouse in Bath, or a listed office block in Edinburgh, our solutions help you retain the historic charm while boosting thermal and acoustic performance to modern standards.
Design & Style
Slim aluminium frames in custom colours that blend with existing interiors
Available in horizontal sliding, vertical sliding, hinged or fixed panel options
Clear, low-emissivity, or acoustic glass available depending on your needs
Designed to be discreet and compatible with original window designs
 A close-up of a white-framed window, looking out onto a sunny green lawn with blurred trees and foliage in the background.
Benefits & Advantages
Ideal for heritage or listed properties where external changes are restricted
Greatly improves thermal performance, reducing heat loss by up to 60%
Significant reduction in outside noise—up to 45dB in some configurations
Cost-effective and easy to install with minimal disruption to occupants
Detachable options for flexible use during different seasons or maintenance
 A white-framed glass patio door or large window, looking out onto a sunny backyard with a green lawn and a wooden fence.
Performance
U-values as low as 1.8 W/m²K for improved energy efficiency
Reduces condensation on original windows by eliminating cold bridging
Meets acoustic requirements for offices, hotels, and city-centre locations
Lightweight design allows for fast, non-invasive installation
 view from inside a room through a set of white-framed patio doors, looking out at a light brown house with a dark roof and a green garden.
Industries We Support
Perfect for
Listed Buildings
Heritage Sites
Homes
Office
Hotels
Libraries
Galleries
Museums
Hotels
Our Installation Process
We believe in a smooth, transparent process from start to finish. Here's what to expect when working with Glazed Windows Ltd:
Consultation & Measurement – We begin with a site visit to discuss your needs, take precise measurements, and assess your space. Our experts will guide you through your options, styles, and finishes.
Quote & Planning – Once we've understood your vision, we'll provide a comprehensive quote and lead time. Our team will coordinate with your schedule, architect, or contractor to ensure seamless planning.
Fabrication & Customisation – Your aluminium doors are made to order in our UK-based facility. We tailor every detail—size, colour, glazing spec, and hardware—to suit your project.
Installation by Professionals – Our experienced fitters will install your doors with care and precision, adhering to the latest safety and building regulations.
Final Inspection & Aftercare – We perform a thorough check and walk-through post-installation. You’ll also receive a warranty and guidance on maintenance and aftercare.
Over 25 years of experience in commercial glazing across the UK
Full project support from design consultation to post-installation care
In-house fabrication for custom sizes and fast lead times
Projects completed across London, Birmingham, Manchester, and beyond
Friendly and professional installation teams
Excellent aftercare, warranties, and support
Trusted by developers, architects, and homeowners across the UK
Why Choose Glazed Windows Ltd?
White-framed French doors open onto a bright backyard with a green lawn, wooden fence, and outdoor furniture. White UPVC French doors, flanked by fixed side windows, lead to a patio and offer a glimpse of a brightly decorated living room. An open white-framed PVC window offers a sun-drenched view of a green lawn and a house in the blurred background.
Expertly Delivered Glazing Systems
Let’s Build Something Exceptional
At Glazed Windows Ltd, we understand that commercial projects require more than just off-the-shelf solutions—they demand precision, durability, and long-term value. Whether you're designing a new office complex, renovating public sector buildings, or upgrading high-traffic retail environments, our commercial glazing solutions are engineered to perform and built to last.

From thermally efficient commercial windows and secure entrance doors to fire-rated glazing and bespoke shop fronts, our product range supports both practical and aesthetic goals. We work closely with architects, developers, and contractors across the UK to deliver glazing systems that meet regulatory standards, enhance building performance, and reflect your brand’s identity.

Every project is handled with care and expertise—from initial consultation and site survey to fabrication, installation, and aftercare. With our experience, in-house manufacturing, and hands-on approach, you can trust Glazed Windows Ltd to deliver results that exceed expectations, on time and within budget.

Looking to start your next commercial project with confidence? Get in touch with the team at Glazed Windows Ltd—we’re ready to discuss your requirements and provide a bespoke solution that aligns with your timeline and vision.
Ready to elevate your property with stunning new Secondary Glazing?
Get in touch for a free consultation and quote—let’s find the perfect window solution for your space.
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About Us
We specialise in premium glazed doors and windows, combining modern design with lasting durability to enhance residential and commercial spaces across the UK. Crafted with precision and built to perform, our products bring light, style, and value to every project.
Contact Us
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Glazed Windows Co.
Unit 8, Middlemore Road Smethwick Birmingham B66 2DZ
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