Quality is Priceless with Original Glass's 5 Year Full Unit Guarantee


Satisfy planning regulations and your client at the same time with ultra slim glazed units from the Original Glass Company. Our heritage sealed units were developed specifically for use in period properties and listed buildings, giving your project the heritage look with a high chance of gaining approval from Planning Authorities.

Double glazed sealed glass units for conservation areas

We have developed a range of sealed glass units specifically for use in restoration projects, or new build projects in conservation areas. These IGUs can be used in all frame types, and can be used with the traditional putty glazing style for added authenticity (using Heritage Putty).

Our Heritage super thin units are double glazed, and can be made using machine drawn or float glass. We can supply glazed units with a Krypton-filled cavity that achieve a centre pane U-value as low as 1.1 W/m2K. Find out more technical specifications about our sealed units, or why not request a sample?

We understand that every heritage project is unique, so please don’t hesitate to contact us with your specific requirements.

View Our Technical Data Make Enquiry

Star and Garter Architect

Industry standards compliance

When choosing Heritage glass sealed units from the team here at The Original Glass Company, all our trade partners can enjoy complete peace of mind knowing that they comply with required industry standards. Further helping glaziers avoid any unwanted surprises when the time comes to install on-site, we’ve covered all angles from product fabrication onwards.

BSI logo

BS 8000 Reference

Meets the British industry standard for general on-site construction principles such as tolerance, accuracy, and fit.

GGF logo

GGF Manual Selection 4.2

All units meet the required glazing definitions, characteristics, and manufacturing processes as laid out by the Glass and Glazing Federation.

BSI logo

BS6262 Glazing for Buildings

Assuring the safety related to human impact in all three regional areas of the UK for the glazing of critical locations.

BSI logo

BS EN 1279: Parts 1-6

Our glazed units meet the strict BS EN 1279 standards which allows us to offer a 5 year guarantee on the entire unit.

Get a Super-thin Double Glazing Sample!

If you’d like to experience our premier product up close, we readily offer those of interest a super-thin double glazed unit sample. Wherever in the UK you are based, simply input your details online and our team will get one sent out to you promptly.

Request Sample

Our glass meets the strictest of standards

BS EN 1279: Parts 1-6

This allows us to:

  • Offer a 5 year guarantee for the entire glazed unit, not just the glass
  • Provide you with industry leading ultra-slim glazing with modern performance
  • Pass the stringent building regulations surrounding conservation projects

Working closely with Conservation Officers

Considerable experience in the heritage build sector has given us a specialist knowledge of planning permission in conservation areas. We have developed our product alongside Conservation Officers and Local Planning Authorities from across the UK, which has given us a unique insight into how to get a building product approved at the design stage. The result is a high spec double glazed unit that doesn’t impede on the original look and use of a heritage building.

Features that help contribute to conservation approval include:

Original Glass Featured Icon

Ultra Slim Sight Lines

The original beading or putty hides the main structure of the unit

Original Glass Featured Icon

Manufactured to Historic standards

Units can be configured in a choice of Cylinder, Hand Drawn, Machine Drawn, or Float glass options

Original Glass Featured Icon

Fully Certified

Our insulating glass units conform to BS EN 1279: Parts 1-6 standards

Original Glass Featured Icon

Modern Performance

An inner pane with Low-E Soft Coat combined with a Krypton gas filled cavity provide thermal benefits equal to new build properties

We chose The Original Glass Company because the product has solid test evidence to underpin its manufacturing quality. The pricing was competitive, the company were proactive in developing the critical details and prototypes for the installation, and the service is what you would expect from a long established professional company. 5th Studio would recommend The Original Glass Company to anyone with a need for specialist thin sealed units.

Oliver Smith, Director - 5th Studio

Technical data, specifications, and information to get projects right first time

Further helping any architect gain a better perspective on the types of sizes, thicknesses, and thermal performance possible with our range of thin sealed glazed units, explore our on-site technical specifications. Here you’ll find everything you need to meet client expectations when taking on your next conservation restoration project, with various heritage glass configurations and options.

View Our Technical Data Request More Info

Discuss your Project

If you’re involved in a historical restoration project, contact The Original Glass Company today. We can help you to make a success out of your project by providing insight, experience, and a wealth of knowledge on a range of issues related to historical buildings.

CE Mark Certification BS EN 1279 Accredited BS EN 12150 Accredited UKAS Certification UK manufactured

Request a glazing sample

Request a sample and we'll send you one to your door of charge.

Get a project quote

Know what you're looking for? Send us a message to request a quote.