Comparison
Double Glazing vs Secondary Glazing: Cost and Performance
Verdict: Double glazing is better long-term; secondary glazing is cheaper and suits listed buildings or rentals.
Double Glazing vs Secondary Glazing: Side-by-Side Comparison
| Criteria | Double Glazing | Secondary Glazing |
|---|---|---|
| Upfront cost | £400–£800 | £150–£400 |
| Est. annual saving | £180/yr | £100/yr |
| Efficiency | 28dB noise reduction | 34dB noise reduction |
| Government grant | Check eligibility | Check eligibility |
| Carbon impact | Low carbon | Higher carbon |
| Installation time | 1–3 days | 1–2 days |
| Best for | New builds and replacements | Listed buildings rentals |
| Verdict | Double glazing is better long-term; secondary glazing is cheaper and suits listed buildings or 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
| Pros | Cons |
|---|---|
| 28dB noise reduction efficiency | Higher upfront cost (£400–£800) |
| Est. £180/yr typical saving | Best suited to: New builds and replacements |
| Lower carbon footprint | May require property assessment first |
Secondary Glazing: Pros and Cons
| Pros | Cons |
|---|---|
| Lower upfront cost (£150–£400) | 34dB noise reduction only |
| Est. £100/yr typical saving | Higher carbon emissions |
| Best suited to: Listed buildings rentals | Less future-proof |
Frequently Asked Questions
Which is cheaper — double glazing or secondary glazing?
Double Glazing typically cost £400–£800, while secondary glazing cost £150–£400. Compare both based on your property and energy needs.
Which saves more money — double glazing or secondary glazing?
Double Glazing may save around £180/yr (estimated), while secondary glazing may save around £100/yr (estimated). 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.