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Slim Double Glazing

Slim profile sealed unitsHeritage & listed buildings

Slim double glazed units are designed for older windows where standard sealed units won't fit — typically timber frames with narrow rebates. At just 14–16mm overall thickness, they upgrade your glazing without altering the character of your property.

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55 products

Slim Profile Double Glazed Unit - 14mm – 4mm Softcoat / Warm-Edge / 56% Thermal
Slim Profile Double Glazed Unit - 14mm – 4mm Softcoat / Warm-Edge / 56% Thermal
£0.00
3wk
Self-Cleaning Glazed Unit - Low Maintenance (Specialist Application)
Self-Cleaning Glazed Unit - Low Maintenance (Specialist Application)
From £200.00
4wk
Self-Cleaning Glazed Unit - Low Maintenance (Roof / Overhead Glazing)
Self-Cleaning Glazed Unit - Low Maintenance (Roof / Overhead Glazing)
From £200.00
6wk
Self-Cleaning Glazed Unit - Low Maintenance (Conservation Area)
Self-Cleaning Glazed Unit - Low Maintenance (Conservation Area)
From £200.00
6wk
Self-Cleaning Glazed Unit - Low Maintenance (Commercial / Shopfront)
Self-Cleaning Glazed Unit - Low Maintenance (Commercial / Shopfront)
From £200.00
3wk
Made to Measure Double Glazed Unit - Custom Size (Bespoke / Architect-Specified)
Made to Measure Double Glazed Unit - Custom Size (Bespoke / Architect-Specified)
From £200.00
4wk
Made to Measure Double Glazed Unit - Custom Size (High-Rise / Exposed Site)
Made to Measure Double Glazed Unit - Custom Size (High-Rise / Exposed Site)
From £200.00
5wk
Made to Measure Double Glazed Unit - Custom Size (Specialist Application)
Made to Measure Double Glazed Unit - Custom Size (Specialist Application)
From £200.00
3wk
Made to Measure Double Glazed Unit - Custom Size (Roof / Overhead Glazing)
Made to Measure Double Glazed Unit - Custom Size (Roof / Overhead Glazing)
From £200.00
3wk
Clear Double Glazed Unit - Standard (Conservation Area)
Clear Double Glazed Unit - Standard (Conservation Area)
From £200.00
3wk
Self-Cleaning Glazed Unit - Low Maintenance (Residential Replacement)
Self-Cleaning Glazed Unit - Low Maintenance (Residential Replacement)
From £200.00
4wk
Made to Measure Double Glazed Unit - Custom Size (Conservation Area)
Made to Measure Double Glazed Unit - Custom Size (Conservation Area)
From £200.00
3wk
Made to Measure Double Glazed Unit - Custom Size (Commercial / Shopfront)
Made to Measure Double Glazed Unit - Custom Size (Commercial / Shopfront)
From £200.00
5wk
Made to Measure Double Glazed Unit - Custom Size (New Build / Extension)
Made to Measure Double Glazed Unit - Custom Size (New Build / Extension)
From £200.00
3wk
Made to Measure Double Glazed Unit - Custom Size (Residential Replacement)
Made to Measure Double Glazed Unit - Custom Size (Residential Replacement)
From £200.00
4wk
Clear Double Glazed Unit - Standard (Commercial / Shopfront)
Clear Double Glazed Unit - Standard (Commercial / Shopfront)
From £200.00
4wk

About Slim Double Glazing

Slim double glazing features ultra-thin sealed units starting from just 12mm total thickness, specifically engineered for heritage windows and narrow timber frames. Available in configurations from 4-4-4mm up to 4-8-4mm, these units incorporate advanced warm edge spacer technology to maximise thermal efficiency within minimal depth constraints.

Despite their compact profile, these units achieve impressive U-values as low as 1.2 W/m²K through Low-E coating and argon gas fill. All sealed units are manufactured to BS EN 1279 standards, ensuring long-term performance and reliability. The energy efficient design significantly improves thermal performance whilst preserving the visual integrity of period properties.

Pane Relief supplies made to measure slim double glazing cut precisely to your requirements. Every unit comes with our comprehensive quality guarantee and free UK mainland delivery, ensuring professional results for your heritage glazing project.

Frequently Asked Questions

  • What is the minimum thickness available for slim double glazing?
    Our slimmest sealed units start from 12mm total thickness, ideal for heritage windows with narrow rebates that cannot accommodate standard 24mm units.
  • What U-value can slim double glazing achieve?
    Slim double glazing can achieve U-values as low as 1.2 W/m²K when specified with Low-E coating, argon gas fill and warm edge spacers.
  • Is slim double glazing suitable for listed buildings?
    Yes, slim double glazing is specifically designed for heritage properties where planning restrictions require minimal visual impact whilst improving energy efficiency.
  • How do I measure for slim double glazing units?
    Measure the glass rebate width, height and depth carefully. We recommend deducting 3-5mm from rebate dimensions to ensure proper fitting allowance.

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