Triple Glazing Calculator

Calculate triple glazing costs for passive house and high-performance windows. Ug 0.5 W/m²K pricing with krypton fill, dual Low-E coatings, and warm-edge spacers.

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Estimate Your Triple Glazed Unit

Preview pricing only. Full calculator adds TGU configuration (4-12-4-12-4, 4-16-4-16-4, 4-18-4-18-4), krypton/argon/mixed gas fill, dual Low-E coating, and spacer system selection.

Triple Glazing for Serious Performance

Passive house, extreme climate, acoustic performance — triple glazing solves problems double glazing can't.

1

Passivhaus-Level Ug Values

A well-specified TGU (4-16-4-16-4 argon, dual Low-E) hits Ug 0.5-0.6 W/m²K. Combined with a Uf 0.8 W/m²K profile system (Passivhaus-certified), the overall Uw sits at 0.8 W/m²K — the Passivhaus threshold. The calculator shows this relationship explicitly.

2

Krypton Fill for Slim TGUs

In slim-frame historic renovation, a 4-10-4-10-4 krypton-filled TGU fits where a standard 4-16-4-16-4 cannot. Krypton is expensive (~€20-30/m²) but the performance per millimetre is unmatched. The calculator handles this edge case.

3

Weight & Structural Considerations

TGUs weigh 35-45 kg/m² vs 22-28 for DGUs. Large triple-glazed panels require reinforced profiles and rated hardware — the calculator flags when your window size exceeds standard hardware ratings and suggests upgrades.

4

Acoustic Triple Glazing

Acoustic TGU combinations like 6.4-12-4-12-8.8 (asymmetric with laminated panes) deliver Rw 45-50 dB — essential for airport-proximate and urban-canyon residential. The calculator includes acoustic PVB interlayer pricing and Rw estimates.

Frequently Asked Questions

Is triple glazing worth the extra cost?
For passive house construction, cold climates (Canada, Scandinavia, Alpine), or high-noise urban settings — yes. For typical UK/mid-European residential where heating loads are moderate, the payback period is 15-25 years — real but slow. The calculator runs the payback math for your specific climate and energy price.
What's the weight difference vs double glazing?
A typical 1.5m × 1.2m double-glazed unit weighs ~40 kg; the same size triple-glazed unit weighs ~65 kg. The 60% weight increase means hardware must be upgraded — heavier hinges, stronger locks, reinforced frames. The calculator includes these hardware uplift costs automatically.
Can I use triple glazing in any window system?
Not any system — the profile must have glass rebates deep enough for a 44-48mm TGU (vs 28-32mm for DGU). Most modern 70mm and 82mm PVC systems accept triple glazing; older 58mm and 62mm systems generally cannot without a glass surround insert.
What's the thermal difference between 4-16-4-16-4 and 4-12-4-12-4?
The wider-cavity 4-16-4-16-4 hits Ug ~0.6 with argon; the slimmer 4-12-4-12-4 argon hits Ug ~0.7. For krypton-filled, the gap narrows — 4-12-4-12-4 krypton matches 4-16-4-16-4 argon. Trade-off: space vs gas cost.

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Price Triple Glazing for Passive House Work

High-performance glazing requires high-precision pricing. Doorwin has both.

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