Leaded Glazing Bar Units

INNOVATIVE SOLUTIONS

Heritage Astragal Glazing Bar Units for Trade Installers

Period Detail, Modern Construction

Leaded Glazing Units offer a timeless aesthetic rooted in centuries of architectural tradition — but with the benefits of modern energy performance. These units simulate the appearance of traditional leaded windows by applying decorative lead strips to the glass, recreating patterns such as diamonds, squares, or Queen Anne borders.

Unlike historic leaded lights, which used actual lead cames to support small panes of glass, today’s leaded units use a single insulated glass unit (IGU) for better thermal performance and structural integrity. The lead is applied to one or both surfaces of the glass, sometimes combined with coloured films or textured overlays to create stained or decorative effects.

How They're Made:

Design Selection: Choose from classic lead patterns (diamond, square, or bespoke).

Lead Application: Decorative lead strips are applied to the surface of the glass.

Encapsulation: The entire assembly is sealed within a double or triple-glazed unit for modern insulation.
Leaded windows. Square

Key Features & Benefits:

  • Traditional Aesthetic: Matches the look of historic leaded windows while delivering modern performance.
  • Energy Efficient: Built with Low-E coatings, argon gas, and warm-edge spacers for strong insulation.
  • Easy Maintenance: A flat surface means the glass is simple to clean, unlike the uneven joins of older leaded lights.
  • Customisable: Available in antique or brass-effect finishes, with soldered joints and colour options.
  • Durable: Factory-applied patination oil prevents oxidation and streaking during the weathering process.
  • Flexible Use: Suitable for windows, doors, fanlights, and conservatories.
  • Best For: Tudor, Elizabethan, and 1930s-style projects; restoration work; characterful additions to new homes.
Leaded windows house

Astragal Glazing Bar:

Factory-applied glazing bars offer clear advantages for installers and end clients alike. By applying leaded glazing bars in a controlled manufacturing environment, we ensure precise alignment, secure bonding and a consistent finish across every unit. This reduces installation time on site, minimises the risk of damage or misalignment, and provides long-term durability — all backed by product warranty for added reassurance.

Best For: Conservation areas, listed building lookalikes, premium developments, and any project where authentic period aesthetics must align with modern performance.

Built for Glaziers. Designed for Heritage Projects.

We understand that installation efficiency and finish quality are critical on heritage projects.

If you’re specifying glazing bars for an upcoming project, contact our team early in the process so we can manufacture your insulated glass units ready for installation.

With fast lead times, factory precision and product warranty for added reassurance, we help you deliver heritage aesthetics with modern performance — on time and with confidence.

By choosing factory-applied glazing bars, you benefit from:

  • Reduced installation time
  • Improved visual consistency
  • Lower snagging risk
  • Reliable long-term performance
  • Professional presentation to your client
  • Warranty

Why Should Glazing Companies Choose Crystal Units for Bar Units?

Because we make your installations faster, cleaner and more reliable.

Factory Precision, Every Time

Our glazing bar units are manufactured in a controlled factory environment, ensuring accurate alignment, consistent spacing and secure bonding. No site guesswork. No uneven sightlines.

Faster Installation on Site

Units arrive ready to fit. That means less labour time, fewer adjustments and quicker turnaround on projects.

Reduced Snagging & Call-Backs

Factory-applied bars minimise the risk of misalignment, detachment or cosmetic issues that can occur with site-fitted systems.

Wide Range of Profiles & Finishes

From Georgian and Astragal to Duplex and external stick-on bars, we offer multiple sizes and powder-coated finishes to suit heritage and contemporary requirements.

Thermal Performance Maintained

Our bar systems are integrated within high-performance insulated glass units, preserving energy efficiency while delivering the traditional multi-pane appearance.

Fast Lead Times

We understand project schedules. Our manufacturing capability allows us to offer efficient production and dependable delivery times.

Product Warranty for Peace of Mind

All factory-applied glazing bar units are covered by warranty, giving glazing companies and their clients added reassurance.