- On average, triple glazing for a two-bedroom house costs around £5,100
- Triple glazing will typically cost £14,400 for a three-bedroom house
- It can save money on energy bills, block out noise, and provide greater security
The average cost of triple glazing in the UK (for a three-bedroom house) is around £5,100. That’s a lot of money, but remember that triple glazing offers a serious upgrade in performance, sealing in warmth and cutting down on noise with precision-engineered layers of insulation.
If your current double glazing starts to underperform, it could leak up to 30% of your home’s heat.
Not sure if triple glazing is the right fit? No problem—our quote tool lets you compare the best double and triple glazing options in seconds. Just enter a few details and get free quotes from trusted local installers.
What type of double glazing do you need?
Get startedHow much does triple glazing cost?
Triple-glazed windows cost 10% to 20% more than double-glazed windows. According to Everest, the average price for triple-glazed windows is between £660 and £4,320 per window.
When talking meter-squared prices, triple-glazing costs an average of £1,200 per m2. Window size will vary depending on your style, but the average height of a uPVC window ranges from 0.45 meters to 1.5 meters.
However, prices will always vary for windows as costs depend entirely on what type, size, and window style you choose. For example, a triple-glazed uPVC casement window usually costs between £660 and £2,200, whereas a tilt-and-turn style will cost 25% more. A triple-glazed bay window costs an average of 150% of this.
Once you’ve settled on all these deciding factors, it’s time to find a company to provide you with an accurate quote. Check out the table below for an overview of typical triple glazing costs to buy and install based on house size.
| Property type | Number of bedrooms | Number of windows | Typical cost |
|---|---|---|---|
| Flat | 2 | 4 | £4,800 |
| Terraced | 2 | 5 | £6,000 |
| Semi-detached | 2 | 8 | £9,600 |
| Detached | 3 | 12 | £14,400 |
Courtesy of CheckaTrade. Prices correct as of April 2025.
As you can see, triple glazing can be expensive if you have a detached house with many windows to replace. If you’re set on this idea, you should know that the more triple-glazed windows you install, the cheaper each window will be.
In other words, to be cost-effective, it’s better to install more windows, rather than fewer. You can learn more about how double glazing compares by visiting our Double Glazing Cost page.
Replacing all the windows with triple glazing in a typical three-bedroom semi-detached property will cost homeowners roughly £13,120. To compare, installing double-glazed windows in the average three-bedroom house in the UK will cost around £11,050.
However, these figures will increase if you opt for pricier styles like bay windows or use an expensive material like aluminium.
Triple glazing cost vs double glazing cost
We can praise triple-glazed windows until the cows come home, but we know that one thing is at the forefront of everyone’s minds when purchasing: the cost.
Everest states that triple glazing costs roughly 10% to 20% more than double glazing. Since double glazing is already expensive, the extra cost might not be worth it, given that both windows have similar benefits.
To give you a rough idea of how much more you can expect to splash out, take a look at this table:
Frame material | Double glazing cost per window | Triple glazing cost per window |
|---|---|---|
uPVC | £250-£350 | £390-£495 |
Wood | £850-£950 | £950-£1,115 |
Aluminium | £375-£570 | £780 – £900 |
As you can see, triple-glazed windows cost a little more than double-glazed windows, but you can decide whether this overshadows the other benefits of triple glazing.
If you’d like to find out how much double glazing will cost, simply fill out this short form, and our qualified installers will contact you.
What type of double glazing do you need?
Get startedIf you’re familiar with double glazing, you’ll be pretty comfortable with its not-so-distant cousin, triple glazing. Triple glazing takes double glazing that extra step further, by simply adding another pane of glass to the window. This third pane of glass acts as an additional layer of insulation to your house, keeping you cosy during those bitter winter months.
Is triple glazing more expensive than double glazing?
Yes, it is, triple glazing typically costs 10% to 20% more than double glazing. In fact, prices ranging from £660 to £4,320 per window, compared to £600 to £3,600 for double glazing, and installation averaging £250 per day, add to the total depending on the number of windows.
For example, replacing all windows in a typical three-bedroom house costs around £13,120 for triple glazing and £11,050 for double glazing. However, prices vary based on window count, size, material, and design—check our guide for potential grants to reduce costs.
Number of windows | Double glazing costs | Triple glazing costs |
|---|---|---|
4 | £5,050 | £5,970 |
7 | £8,650 | £10,260 |
9 | £11,050 | £13,120 |
12 | £14,775 | £17,535 |
16 | £19,700 | £23,380 |
20 | £24,500 | £29,100 |
* Note: these numbers are just estimates. The cost of double and triple-glazing will vary greatly depending on the number of windows a property has, the size and design of the windows, the material they are made of, and the time it takes to install them.
Triple glazing outperforms double glazing in thermal efficiency, with a lower U-value of 0.8 compared to 1.6. Thanks to its third pane of glass, triple glazing offers better insulation, noise reduction, and improved security.
However, this added layer can slightly reduce natural light, making rooms feel dimmer, though triple glazing is the superior choice for energy savings and overall comfort.
| Category | Double glazing | Triple glazing |
| Thermal performance | ✔ | |
| Sound insulation | ✔ | |
| Home security | ✔ | |
| Light penetration | ✔ | |
| Cost | ✔ |
Triple glazing adds a third pane separated by insulating gas like argon, which reduces heat loss more effectively than air while dampening noise, enhancing security, and boosting property value. However, the added weight can stress some walls, so checking if your home’s structure can support it is important.
What factors affect the cost of triple glazing?
Several factors can alter the price of your windows, including:
- The type of window frame material – You can choose between uPVC, timber, and aluminium. UPVC is the best way to go if you’re on a budget. While timber and aluminium are on the pricier side, they’re more aesthetically pleasing
- The size and number of windows – This one’s pretty self-explanatory, but the more windows you need/the larger they are, the more materials will need to be sourced, which will push up the price
- Location – Window installations tend to be more expensive in the south of the UK, especially in London
- Access to the windows – The installer might need to put up some scaffolding to access the windows, which can cost between £1,000 to £1,300 for an average four-bedroom property
Yes, triple glazing locks in heat and stops it from entering your home through the windows in the summer months. A window’s G-value, which measures the amount of solar intake that the glass allows, tends to be lower for triple-glazed windows. The lower the number, the more effective the glazing is at controlling the temperature inside.
This is ideal for conservatories that tend to overheat in the summer and suffer from what experts in the field call ‘the greenhouse effect’.
Are there any grants for triple glazing?
No, there are currently no grants specifically for triple glazing, which is likely because it offers the same benefits as double glazing—it’s just slightly more effective at them.
However, some homeowners in the UK can apply for grants for double glazing. The most flexible one is ECO4, an extension of the government’s Energy Company Obligation (ECO) scheme, which has been running since April 2022 and ends in March 2026.
The main goal of this grant is to support low-income households by upgrading their homes to be more cost-efficient and environmentally friendly.
Want to find out which grants are available in your area? Visit our page on double glazing grants in the UK to learn more.
Highlight box: Does triple glazing reduce condensation?
With triple glazing, you can significantly reduce the risk of window condensation. Since triple-glazed windows have an extra pane of glass, they offer more insulation and, therefore, reduce a build-up of moisture around the window.
Is triple glazing worth the extra cost?
It probably isn’t worth the extra cost because double glazing is already so beneficial.
But don’t get us wrong, it offers added insulation, extra security, and another buffer to noise outside compared to double glazing. However, you’ll be paying more for minimal benefits.
The typical UK household will find that double glazing is enough for them – it has all the same benefits but is slightly cheaper. Plus, double glazing can increase the value of your property.
Triple glazing might be worth it for people in particularly noisy areas, or homes that need substantial insulation to keep in the warmth. You can read our full verdict on our page, Double Glazing vs. Triple Glazing: Which Is Better.
Summary
- Triple glazing can save more on heating bills while enjoying a warmer, quieter home all year round.
- It’s three panes of glass with insulating gas layers dramatically reduce heat loss and external noise.
- Low-emissivity coatings reflect heat into your home, keeping rooms warmer for longer.
- Sealed units prevent internal condensation and extend the lifespan of your windows.
- Triple glazing offers U-values as low as 0.8, outperforming most standard double-glazed units.
