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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

Standard Double-Glazed Unit
Standard Double-Glazed Unit
From £200.00
24–28mm | Domestic & light commercial
Safety & Security Double-Glazed Unit – Made to Measure
Safety & Security Double-Glazed Unit – Made to Measure
From £200.00
1wk 0
Low-E Argon IGU
Low-E Argon IGU
From £200.00
34wk
Double Glazed Unit – 1000 × 800 mm
Double Glazed Unit – 1000 × 800 mm
From £200.00
4wk 0
Single Cut Shape | Lead Time 4 weeks
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Planitherm 1.0 / Warm-Edge / Argon / 65% Thermal
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Planitherm 1.0 / Warm-Edge / Argon / 65% Thermal
£0.00
2wk
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Softcoat / Aluminium / Argon / 70% Thermal
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Softcoat / Aluminium / Argon / 70% Thermal
£0.00
2wk
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Softcoat / Warm-Edge / Argon / 83% Thermal / Ground
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Softcoat / Warm-Edge / Argon / 83% Thermal / Ground
£0.00
2wk
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Planitherm 1.0 / Warm-Edge / Argon / 66% Thermal
Self-Cleaning Glazed Unit - Low Maintenance – 6mm Planitherm 1.0 / Warm-Edge / Argon / 66% Thermal
£0.00
2wk
Made to Measure Double Glazed Unit - Custom Size – 6mm Softcoat / Aluminium / 66% Thermal / Seamed
Made to Measure Double Glazed Unit - Custom Size – 6mm Softcoat / Aluminium / 66% Thermal / Seamed
£0.00
3wk
Made to Measure Double Glazed Unit - Custom Size – 4mm Clear / Aluminium / Argon / 63% Thermal / Seamed
Made to Measure Double Glazed Unit - Custom Size – 4mm Clear / Aluminium / Argon / 63% Thermal / Seamed
£0.00
4wk
Made to Measure Double Glazed Unit - Custom Size – 4mm Clear / Aluminium / Argon / 63% Thermal / Ground
Made to Measure Double Glazed Unit - Custom Size – 4mm Clear / Aluminium / Argon / 63% Thermal / Ground
£0.00
3wk
Made to Measure Double Glazed Unit - Custom Size – 4mm Clear / Warm-Edge / 69% Thermal
Made to Measure Double Glazed Unit - Custom Size – 4mm Clear / Warm-Edge / 69% Thermal
£0.00
5wk
Low-E Coated Glazed Unit - Energy Efficient – 4mm Softcoat / Warm-Edge / Argon / 84% Thermal
Low-E Coated Glazed Unit - Energy Efficient – 4mm Softcoat / Warm-Edge / Argon / 84% Thermal
£0.00
5wk 0
Low-E Coated Glazed Unit - Energy Efficient – 4mm Planitherm 1.0 / Aluminium / Argon / 83% Thermal
Low-E Coated Glazed Unit - Energy Efficient – 4mm Planitherm 1.0 / Aluminium / Argon / 83% Thermal
£0.00
4wk 0
Low-E Coated Glazed Unit - Energy Efficient – 4mm Planitherm 1.0 / Warm-Edge / Argon / 88% Thermal
Low-E Coated Glazed Unit - Energy Efficient – 4mm Planitherm 1.0 / Warm-Edge / Argon / 88% Thermal
£0.00
2wk 0
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / 66% Thermal
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / 66% Thermal
£0.00
6wk

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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