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Comparison

Double Glazing vs Secondary Glazing: Cost and Performance

By Home Energy Quotes · Updated March 2026

Short answer

Double glazing is better long-term; secondary glazing is cheaper and suits listed buildings or rentals.

Which suits you

Double Glazing: New builds and replacements
Secondary Glazing: Listed buildings rentals

Side by side

Criteria Double Glazing Secondary Glazing
Upfront cost £400–£800 £150–£400
Could save (est.) up to £104/yr No reliable figure
Efficiency 28dB noise reduction 34dB noise reduction
Government grant none none
Carbon impact Low carbon Higher carbon
Installation time 1–3 days 1–2 days
Best for New builds and replacements Listed buildings rentals

Which should you choose?

Double glazing is better long-term; secondary glazing is cheaper and suits listed buildings or rentals.

If you’re primarily concerned with upfront cost, Secondary Glazing (typically £150–£400) is generally the lower-cost option. If you want potentially lower running costs and a smaller carbon footprint long-term, Double Glazing may offer better long-term value.

Double Glazing: pros and cons

Where it wins

  • 28dB noise reduction efficiency
  • Could save up to £104 a year
  • Lower carbon footprint

Where it struggles

  • Higher upfront cost (£400–£800)
  • Best suited to New builds and replacements
  • May need a property assessment first

Secondary Glazing: pros and cons

Where it wins

  • Lower upfront cost (£150–£400)
  • No reliable saving figure
  • Best suited to Listed buildings rentals

Where it struggles

  • 34dB noise reduction only
  • Higher carbon emissions
  • Less future-proof

Questions about double glazing and secondary glazing

Which is cheaper — double glazing or secondary glazing?
Double Glazing typically cost £400 to £800, while secondary glazing cost £150 to £400. Compare both based on your property and energy needs.
Which saves more money — double glazing or secondary glazing?
Double Glazing could save up to £104 a year (estimated). We don’t publish a saving figure for secondary glazing: no official source gives one. Actual savings depend on your property, usage and tariff.
Which is more efficient — double glazing or secondary glazing?
Double Glazing have an efficiency of around 28dB noise reduction, compared to 34dB noise reduction for secondary glazing.
Can I install both double glazing and secondary glazing?
Yes, many homeowners combine both technologies. A combined system may help reduce your bills further and increase your home’s energy independence.
Do both qualify for government grants?
Both double glazing and secondary glazing may qualify for government grants or schemes depending on eligibility. Criteria may change, so always check the latest requirements before proceeding.

Get quotes for either, or both

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