Heritage

Victoria Baths opening vents
Govanhill Baths, Glasgow
Withington Baths, Manchester commercial glazing services
Derby market side
Royal Exchange skylights
Granby Street, Leicester - glazing bar spans

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Heritage product brochure

Our Heritage glazing bars are a truly distinctive solution for glass roof systems in historic and listed buildings. Heritage glazing refers to specialised roof glazing systems designed for listed and conservation projects, combining traditional appearance with modern performance. Manufactured from lead-covered steel and designed in line with traditional Victorian-era specifications, these bars combine historical authenticity with modern performance.

No other product on the market matches the heritage integrity of our leaded heritage double glazing bar system. Designed for use on both listed properties and prestige new-builds, these bars are ideal for applications where aesthetics, tradition and performance must align. Whether you’re restoring a Grade I or Grade II structure, or adding classic character to a contemporary building, this range is your go-to solution for glazing bars for glass roofs.

Each metal glazing bar consists of a galvanised mild steel core, enclosed in a seamless lead extrusion with a twin-wing weathering system. This unique construction ensures strength, durability and protection from heat loss – even when used with double glazed units or glazing sheets.

Advantages

  • Conservation product.
  • Perfect for listed or historic buildings.
  • Hermetically sealed lead covers.
  • Original cast brass furniture.
  • Suitable for accepting opening vents.
  • Suitable for skylights.
  • Suitable for canopies/walkways.
  • Single, double or triple glazed options.

Considerations

  • Only exempt from ‘L’ Reg compliance on listed and historic buildings or when ‘trade offs’ are used from other parts of the building.
HSA-AAA-AA1 steel glazing bar

Heritage LC7 SG lead covered steel glazing bar – single glazed (6mm to 8.8mm thickness only)

HDA-AAA-AA1 steel glazing bar

Heritage LC7 DG lead covered steel glazing bar – double glazed (30mm thickness only)

Our Heritage leaded steel glazing bars are a unique system, combining the strength of metal glazing bars with the authenticity of Victorian design. Featuring a galvanised steel core and seamless lead extrusion, the glazing bar includes a twin-wing weathering system, hermetically sealed lead ends and cast brass fixings.

Designed for roof glazing applications, these bars meet BS5516:2004 standards for both sloped and vertical installations. They are ideal for use with glass or polycarbonate infill panels, and compatible with single, double or triple glazed units, including leaded heritage double glazing.

Whether you’re restoring a Grade 1 or Grade 2 listed building or creating a traditional-style roof on a new project, our Heritage glazing bars for glass roofs deliver performance and historical accuracy.

Unlike aluminium alternatives, the Heritage bar typically weighs more than twice as much, providing both durability and structural rigidity. Despite this, Heritage glazing bar costs are comparable to modern powder-coated systems like our Skyline SPG7.

Produced in-house using the original heavy-duty rolling equipment, each bar is engineered for long-lasting performance and is suitable for conservatory roofs, canopies and bespoke architectural glazing.

This solution supports a full range of glazing options, with superior thermal properties to reduce heat loss — making it an increasingly popular choice for clients seeking energy-efficient heritage-style glazing systems.

Discover our latest brochures!

Our new range of brochures are now available to download, offering a comprehensive look at our full product line and capabilities.

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Span Chart

Performance Data for Heritage patent glazing bars

Bar Section
No7 SG
No7 DG
Bar Depth (mm)
53
53
Lx-mm4
136,847
136,847
Zxx-mm3 Plastic Modulus
4,189
4,189
Roof Span (mm)*
Double Glazing
–
1350-3270
Single Glazing
1430-3570
–
Canopy Glazing
1540-2800
–

The glazing bar spans shown above are based on using 6mm thick glass for the double glazed, single glazed and canopy types, and the bars being spaced at 600mm centres. We will select the appropriate glazing bar for each contract. Spans are dependent upon the site location and exposure rating, site altitude, distance from the sea, height of glazing from ground level, shape of the roof, pitch of glazing, glazing bar centres, glass weight, wind speeds, snow load, dead load and maintenance loads.

* The above spans for each glazing bar have two values. The lower span values are calculated using the most extreme environmental loadings possible in the UK whereas the higher span values are based on the least extreme. Due to the wide range of these values it is therefore essential that we are supplied with the site postal code to enable us to calculate the correct glazing bar type for every project. There are a large number of variables which are used to determine the maximum span of the glazing bars so please do not attempt to buy any glazing bar materials from us without first allowing us to carry out the necessary calculations for your project.

Heritage Glazing frequently asked questions

  • What is heritage double glazing?

    Heritage double glazing is a window or roof glazing system designed for historic and listed buildings. It combines traditional aesthetics, such as leaded bars, with modern thermal performance, offering single, double or triple glazed options for rooflights, canopies and walkways.

  • What is heritage glass?

    Heritage glass refers to glass used in conservation projects or historic buildings that replicates traditional Victorian or Edwardian glass styles. It maintains the visual character of original structures while meeting modern performance standards.

  • What buildings are suitable for Heritage glazing bars?

    Heritage glazing bars are ideal for listed buildings, historic restorations, and prestige new builds that require traditional-style glazing. They can also be used in contemporary projects that want to replicate Victorian aesthetics.

  • Are Heritage glazing bars thermally efficient?

    Yes, they are designed to work with single, double or triple glazed units and include a twin-wing weathering system, reducing heat loss while retaining heritage authenticity.

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