Compare U‑values, costs and recycling potential to decide whether double or triple glazing delivers the best ROI—plus how to claim £2,500 back.

Efficiency Face‑Off

Double glazing already halves heat loss compared to single glazing, but triple glazing cuts another 30 – 50 %.

Key Comparison Points

• Thermal Performance – Most A‑rated double‑glazed units hit 1.4 W/m²K; modern triple can reach 0.8 W/m²K.
• Cost Difference – Expect to pay ~20 % more for triple; payback depends on insulation levels elsewhere.
• Weight & Frames – Triple units are heavier; older timber sashes may need reinforcing or replacing.
• Noise Reduction – Extra pane + wider cavities cut external noise by another 3‑5 dB—ideal for busy roads.
• Recycling Compatibility – Both types use the same recyclable PVC‑U or aluminium frames—still eligible for the £2,500 rebate.

Decision Matrix

If you’re in a mild UK climate and plan to stay <10 years, A‑rated double glazing strikes the best balance. For forever homes in colder zones or next to an A‑road, triple makes sense.

Savings Stack

Whichever route you choose, trading in all old units together maximises the recycling discount—up to £2,500 off in one go.