New Build & Extension — Triple Glazing
Pane Relief triple-glazing for new build & extension applications. The information below covers the products and considerations specific to this use case. Use the configurator above to spec your exact dimensions and glass for an instant price.
28mm Triple Glazed Unit — New Build & Extension Compliance
Building a new home or extension? Our 28mm Triple Glazed Unit meets and exceeds Building Regulations Part L thermal requirements, with a centre-pane U-value of 0.9 W/m²K — well below the 1.4 W/m²K maximum for new-build windows. This Energy A+ rated unit delivers compliance without premium pricing.
For architects and builders specifying glazing for new construction, the 28mm profile offers flexibility across frame systems. Compatible with most uPVC, aluminium, and timber window profiles designed for double or triple glazing, this unit simplifies procurement without compromising your SAP calculation.
Technical Performance
This Energy A+ rated triple glazed unit packs three panes of precision-cut float glass into a 28mm sealed unit — the same thickness as many standard double-glazed units. The configuration uses 4mm-8mm-4mm-8mm-4mm glass-cavity-glass layering with argon gas fill and a soft-coat Low-E coating on surface 5.
36mm Triple Glazed Unit — Future-Proof New Build Glazing
Building Regulations are tightening. The Future Homes Standard (expected 2025) will demand significantly lower whole-building U-values. Our 36mm Triple Glazed Unit with a U-value of 0.6 W/m²K doesn't just meet current Part L — it future-proofs your new build against the next generation of thermal regulations.
For developers and self-builders, specifying 36mm triple glazing now avoids costly retrofitting when standards change. The marginal cost difference between 28mm and 36mm triple is typically 15–20% — a fraction of the cost of replacing windows post-construction.
Peak Thermal & Acoustic Performance
The 36mm build-up uses 4mm-12mm-4mm-12mm-4mm configuration with double soft-coat Low-E coatings and the option of krypton or argon gas fill. The 12mm cavities are at the optimal width for gas-fill thermal performance, delivering the lowest U-value achievable in a standard triple-glazed format.
Acoustic Triple Glazed Unit — New Build Acoustic Compliance
Planning authorities increasingly attach noise conditions to new developments near transport corridors, commercial zones, and nightlife areas. Our Acoustic Triple Glazed Unit delivers 44dB Rw sound reduction, meeting the requirements of Building Regulations Approved Document E and satisfying the acoustic specifications commonly imposed by planning officers.
For developers building near roads (>50dB LAeq daytime), railways, or airports, acoustic glazing is not optional — it's a planning condition. Specifying 44dB-rated units at design stage avoids costly retrofitting after occupants complain and the local authority enforces the condition.
How 44dB Acoustic Glazing Works
Standard sealed units use identical glass thicknesses on all panes — which creates resonance at specific frequencies, allowing noise through. Our acoustic units use asymmetric glass configurations (typically 6mm outer, 4mm middle, 6.4mm acoustic laminated inner) that break up resonance patterns across the full frequency spectrum.
The acoustic PVB interlayer in the laminated pane is specifically formulated to dampen sound vibration — it's softer and more viscoelastic than standard PVB, absorbing energy rather than transmitting it. Combined with argon gas fill and Low-E coating for thermal performance, this unit doesn't sacrifice energy efficiency for noise reduction.
Commercial Triple Glazed Unit — Office & Corporate
Modern office buildings, corporate headquarters, and co-working spaces demand glazing that delivers thermal comfort, acoustic separation, and a professional aesthetic. Our Commercial Triple Glazed Unit achieves a U-value of ~0.7 W/m²K with toughened glass for safety — critical in occupied commercial buildings.
For BREEAM assessments, high-performance glazing directly contributes credits in the Energy category. Specifying our commercial triple units with 0.7 W/m²K helps achieve Excellent and Outstanding ratings — increasingly a requirement for institutional tenants, government offices, and NHS facilities.
Built for Commercial Demands
Every commercial unit uses 6mm toughened glass on outer and inner panes — four times stronger than standard float glass and five times more resistant to thermal stress. If broken, toughened glass fragments into small, relatively harmless pieces rather than dangerous shards, meeting BS EN 12150 safety requirements for commercial premises.
Triple Glazed Window Unit — Sash Window Replacement
Upgrading sliding sash windows to triple glazing requires careful attention to unit thickness and weight. Traditional sash windows use counterbalance weights or spiral balances that are calibrated for specific glass weights. Our Triple Glazed Sash Window Unit is available in slim build-ups from 28mm to fit sash frames while keeping weight within balance system tolerances.
Sash windows in period homes are often a defining architectural feature — you want to upgrade the glass performance without changing the window's character. Our slim triple-glazed units maintain the traditional sightlines and reveal depths that conservation officers and homeowners value, while dramatically improving thermal and acoustic performance.
Specification
Our standard triple-glazed window units are available in 28mm, 32mm, and 36mm overall thickness to suit different frame systems. All units include Low-E coating as standard, with argon gas fill available as an upgrade.
- U-value: 0.7–0.9 W/m²K (depending on build-up)
- Thickness options: 28mm, 32mm, 36mm
- Low-E coating: Included as standard
- Gas fill: Argon (90%+), available as an upgrade
- Glass options: Clear, obscure, tinted, solar control
Compatible with most modern window frame systems including uPVC, aluminium, timber, and composite. Custom sizes manufactured to order.