Established 1968

Heritage Double Glazed Units

Enjoy modern energy efficiency, even with your older windows, with our Slimline Heritage Double Glazed Units. Based in Coventry, we are the leading supplier of Slimline Double Glazed Units for Sash, Casement and Crittal windows nationwide.

Our Slimline Double Glazed Units are specially designed to fit into single-glazed windows, breathing new life into older windows while delivering exceptional energy-saving benefits.

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0247 658 1155

At Heritage Double Glazed Units, we take pride in manufacturing our own slimline double-glazed units, specifically designed to replace single glazing. The slimline units are ultra-thin double-glazed units suitable for Sash, Casements, and Crittall windows. We supply and glaze slimline units for joinery companies, builders, and domestic customers across the UK. Click here to read what some of our customers have said about us.

Our Slimline Double Glazed Units provide modern energy efficiency to all heritage windows.

Revitalise your windows with the cutting-edge technology of Slimline Double Glazed Units from Heritage Double Glazed Units. Experience the perfect blend of energy efficiency, style, and functionality. Contact us today to explore how our Heritage Double Glazed Units can enhance your windows and transform your living spaces.

Our Slimline Heritage Double Glazed Units replicate the look of single glazing, maintaining the building’s charm and historical features. Only on close inspection can you see that the glass is actually double-glazed.

When fitted into sash or casement window frames, these slimline units are nearly invisible. Unlike standard double glazing, they lack double reflections or distorted reflections, making them an excellent choice for conservation or listed buildings.

Thanks to advances in modern technical glasses and the use of inert gas between the two panes, homeowners can enjoy the thermal and sound benefits of regular double glazing, without sacrificing the appearance or value of their property.

Key Features of Slimline Units

Ultra-Thin Design:
Slimline units are not only energy-efficient but also ultra-thin, providing a sleek and modern look to your windows.
Perimeter Sightline of 8mm:
With a perimeter sightline of 8mm (3mm warm edge material + 5mm edge sealant), Slimline units are ideal for narrow sash window glazing bars.
Discreet Size:
The discreet size of our Heritage units helps maintain the periodic look of a period window. After face putty has been applied, these double-glazed units become virtually undetectable, making them perfect for Conservation and Listed Buildings.
Versatile Applications:
Our Slimline double-glazed units can be used for new Sash windows or as an upgrade to old single glazing, helping you conserve energy, reduce heating bills, and minimise condensation problems.
Technical Excellence:
Our slimline double-glazed units are crafted using advanced materials, including 4mm Planitherm Total Plus, Argon gas-filled cavities, and clear float glass. The technical excellence of our products is reflected in their impressive ‘U’ values, ensuring top-notch performance.

In-House Manufacturing

Our Heritage Slimline Double-Glazed Units are expertly manufactured in-house, where we have been manufacturing glass for over 50 years! This allows us to produce mm-perfect units for any window, including circular, raked and arched windows.

Play Video about How Our Heritage Double Glazed Units Are Made Overlay

Technical Information

Glass Composition:
Manufactured using 4mm Planitherm Total Plus – 4mm Argon/Krpyton gas-filled cavity – 4mm clear float.
Warm Edge:
Super spacer warm edges are used as standard.
Depth Options:
Can be manufactured to a minimum of 11mm overall depth, using a 3mm outer clear float.
Energy Efficiency:
Achieves a ‘U’ Value from 1.9 with a 4mm cavity and a ‘U’ Value of 1.5 with a 6mm cavity.
Additional Options:
1. Also available in toughened glass for low-level glazing and doors.
2. Also available in obscure glass for bathrooms and other privacy-focused areas.
3. Available in various shapes including circles, rakes, and arches.

Installation

Watch as Neil, one of our skilled craftsmen, expertly installs our Heritage Slimline Units into a classic sash window.

The slim sightlines, combined with traditional putty application, make it almost impossible to distinguish our Slimline Units from traditional single-glazing. The result is a window that not only stands as a testament to timeless aesthetics but also conceals the advanced technology within.

Contact us today to experience the perfect blend of heritage preservation and cutting-edge performance with our Slimline Heritage Units.

Play Video about Installing Our Heritage Double Glazed Units Into A Window Overlay

Why Choose Heritage Double Glazing?

1. Decades of Experience: With over 50 years in the industry, we’re perfectly placed to offer superior, fully customised heritage glazing solutions for all your needs.

2. Nationwide Supply: While we are based in Coventry, we supply our Slimline Double Glazed Units for local collection or nationwide delivery. We work with specialist couriers to ensure your units arrive in perfect condition, ready for installation.

3. Quality Craftsmanship: We pride ourselves on producing glass products of the highest quality. Our commitment to craftsmanship ensures durable, reliable, and energy-efficient units for every project.

4. Customisation Options: Whether you need toughened glass for low-level glazing and doors, obscure glass for privacy, or unique shapes like circles, rakes, and arches, Heritage Double Glazed Units has you covered.

What Our Customers Say

M G Joinery
Glass Replacements have been supplying M G Joinery with glass and IGUs for more than 40 years. The service we have received has remained first class and we are sure that we will be a customer of Glass Replacements for many more years.
In recent years the development of slimline units has allowed us to meet our customers’ demands for traditional windows with modern efficiency and reliability. Glass Replacements Slimline Units are ideal for joinery which is destined for listed buildings or buildings in conservation areas.
Elite Windows
I started using Glass Replacement Ltd after being continually let down and messed about by my previous suppliers. Changing any supplier is always a big risk but in truth I really haven’t looked back. It’s a cliche but I wish I’d have changer sooner.
My customers are often amazed how quickly I can turn around the windows. In truth that’s largely down to how efficient the guys at Glass Replacements are.
Needless to say, the units are always first quality and alongside the support and advice on hand I really couldn’t recommend Owen, Neil, Ash and the guys enough.
There's few companies who supply Heritage Slimline Double Glazing so finding a high quality and professional supplier is like gold dust.
Tooth Joinery
Glass Replacements have been our go to glass supplier for 30+ years.
Not only do they have a fast turnaround on all our orders but the team are always on hand with their expertise, help and advice when needed.
We are very impressed with the high standard of work, speed of their quotes and their in-depth understanding of our business needs. Fantastic customer service.
Classic Sash Windows
Classic Sash Windows have been using the services Glass Replacements offer for over 10 years.
We order high volumes of Heritage Units regularly which they manufacture for us rapidly without compromising the quality of their product.
All of the lads at Glass Replacements are friendly, knowledgeable and will always go the extra mile to help and deliver on any requirements.