Window Replacement Glass

Failed sealed units replacedMatched to original spec

If your windows are misted, draughty or damaged, you probably don't need new frames — just replacement sealed units that slot straight into your existing windows. We manufacture every unit to your exact measurements in Bristol, with free delivery and a 10-year guarantee.

Filter and sort

42 products

Clear Double Glazed Unit - Standard (Commercial / Shopfront)
Clear Double Glazed Unit - Standard (Commercial / Shopfront)
From £200.00
4wk
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / 66% Thermal
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / 66% Thermal
£0.00
6wk
Clear Double Glazed Unit - Standard – 6mm Clear / Aluminium / 61% Thermal
Clear Double Glazed Unit - Standard – 6mm Clear / Aluminium / 61% Thermal
£0.00
2wk
Clear Double Glazed Unit - Standard – 6mm Clear / Warm-Edge / 59% Thermal
Clear Double Glazed Unit - Standard – 6mm Clear / Warm-Edge / 59% Thermal
£0.00
6wk
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / 55% Thermal
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / 55% Thermal
£0.00
4wk
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / Argon / 65% Thermal
Clear Double Glazed Unit - Standard – 8mm Clear / Aluminium / Argon / 65% Thermal
£0.00
5wk
Clear Double Glazed Unit - Standard – 6mm Clear / Aluminium / 56% Thermal
Clear Double Glazed Unit - Standard – 6mm Clear / Aluminium / 56% Thermal
£0.00
6wk
Acoustic Double Glazed Unit - 38dB Noise Reduction – 6.4mm Softcoat Lam / Aluminium / Argon / 69% Thermal
Acoustic Double Glazed Unit - 38dB Noise Reduction – 6.4mm Softcoat Lam / Aluminium / Argon / 69% Thermal
£0.00
5wk
Acoustic Double Glazed Unit - 38dB Noise Reduction – 6.4mm Softcoat Lam / Aluminium / Argon / 75% Thermal
Acoustic Double Glazed Unit - 38dB Noise Reduction – 6.4mm Softcoat Lam / Aluminium / Argon / 75% Thermal
£0.00
4wk
Acoustic Double Glazed Unit - 38dB Noise Reduction – 6.4mm Softcoat Lam / Warm-Edge / Argon / 67% Thermal
Acoustic Double Glazed Unit - 38dB Noise Reduction – 6.4mm Softcoat Lam / Warm-Edge / Argon / 67% Thermal
£0.00
3wk

About Window Replacement Glass

Our window replacement glass consists of precision-engineered sealed units designed to restore your windows' performance without frame replacement. Available in configurations from 4-4-4mm triple glazing to 6-16-6mm double glazing, each unit incorporates Low-E coating and argon gas fill for maximum energy efficiency.

Advanced warm edge spacer technology and argon gas retention deliver U-values as low as 0.8 W/m²K, significantly improving thermal performance. All units comply with BS EN 1279 standards and feature high-performance spacer bar systems that reduce heat transfer and condensation risk around glazing edges.

Every sealed unit is made to measure using your exact specifications, ensuring perfect fit within existing frames. Manufactured in our UK facility with comprehensive quality guarantee and nationwide delivery service.

Frequently Asked Questions

  • What U-values can I achieve with replacement window glass?
    Our sealed units achieve U-values from 2.8 W/m²K for standard double glazing down to 0.8 W/m²K for advanced triple glazing with Low-E coating and argon gas fill.
  • How long do sealed units with warm edge spacer technology last?
    Units manufactured to BS EN 1279 standards with warm edge spacer bars typically last 20-25 years. We provide comprehensive warranty covering seal failure and gas retention.
  • Can you match existing window glass thickness and specifications?
    Yes, we manufacture made to measure units matching your original specifications exactly, including glass thickness, overall unit depth, and glazing bar profiles for seamless replacement.
  • How do I measure for replacement sealed units?
    Measure width and height of existing glass rebate, noting any glazing beads or gaskets. We provide detailed measuring guides and can verify dimensions before manufacture.

Need Help Choosing the Right Glass?

Our glazing experts are here to help you find the perfect solution

Get a Free Quote Call 0117 330 3057

Recently Viewed