How Much Does Triple Glazing Cost?
Triple glazing typically costs around 15 to 25 percent more than double glazing, which works out at roughly £150 to £300 extra per window supplied and fitted. This guide explains the price difference, when the upgrade is worth it, and how grants and funding can bring the cost down. All prices are a guide and subject to a free survey.
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The price difference explained
Triple glazing uses three panes of glass with two insulating cavities, where double glazing uses two panes and one cavity. The extra pane, the wider frame needed to hold it and the heavier sealed unit all add to the cost.
As a rule of thumb, you should expect to pay around 15 to 25 percent more for triple glazing than for the equivalent double glazed window. In cash terms that is roughly £150 to £300 extra per window for a typical uPVC casement, though larger windows and premium glass specifications can push this higher.
For the full picture on standard double glazing, see our main double glazing costs guide.
Triple glazing prices per window
Indicative supply and fit costs for a single uPVC casement window. All prices are subject to a free survey.
| Glazing type | Guide price per window | Notes |
|---|---|---|
| Double glazing (uPVC casement) | £400–£950 | Standard A-rated unit |
| Triple glazing (uPVC casement) | £550–£1,250 | Around 15–25% more |
| Typical extra for triple | £150–£300 | Per window vs double |
Prices are a guide only. Your exact cost depends on window size, frame, glass specification and the number of windows fitted, confirmed at a free survey.
When triple glazing is worth it
Triple glazing earns its extra cost in the right home. It makes the biggest difference where heat loss and noise are most noticeable.
- ✓ Cold or exposed homes in windy, rural or coastal locations
- ✓ North-facing rooms that rarely get direct sun and feel cold
- ✓ Busy or noisy roads where you want extra peace and quiet
- ✓ The warmest possible result, with A++ rated window energy ratings available
- ✓ New extensions or rooms where you want to lock in long-term comfort
You can compare the full triple glazing range and specifications on our triple glazing product page.
Is triple glazing worth the extra?
For an average, well-sheltered home, modern A-rated double glazing already performs strongly, so the extra spend on triple glazing delivers smaller gains in comfort and bills. The payback on energy savings alone can be slow.
Where triple glazing genuinely shines is comfort and noise rather than pure cost recovery. If your home is cold, exposed or noisy, or if you simply want the best result and plan to stay long term, the upgrade is usually worth it. If budget is tight, putting your money into more A-rated double glazed windows often gives a better overall return than fewer triple glazed ones.
The clearest way to decide is a free survey, where the spec, exposure and your priorities are weighed up against the price for your specific property.
How to pay less for triple glazing
You do not always have to pay full price up front. Qualifying UK homeowners may be able to cut the cost of new glazing through funding rather than paying for the whole job themselves. See whether you could be eligible for help through our double glazing grants and our window replacement grant pages, then check your eligibility in under 60 seconds.
Related cost guides
Triple glazing cost questions
Is triple glazing worth it?
Triple glazing is most worth it for cold or exposed homes, north-facing rooms, properties on busy roads, and anyone aiming for the warmest, quietest result. For an average, well-sheltered home, A-rated double glazing already performs strongly, so the extra spend on triple glazing delivers smaller comfort and bill gains. A free survey is the best way to judge whether the upgrade is worth it for your property.
What is the difference in cost between triple and double glazing?
As a guide, triple glazing typically costs around 15 to 25 percent more than double glazing, which works out at roughly £150 to £300 extra per window supplied and fitted. The exact difference depends on window size, frame type, glass specification and how many windows you are replacing. All prices are a guide and subject to a free survey.
Does triple glazing reduce noise?
Triple glazing can help reduce noise, especially when combined with different glass thicknesses and wider cavities. However, the biggest noise gains usually come from acoustic glass rather than simply adding a third pane. If noise reduction is your main goal, mention it at survey so the right glass specification can be recommended.