How Much Does Triple Glazing Cost in 2026?
A triple-glazed uPVC casement window typically costs about £600 to £1,980 fitted, per window, depending on size and how many you order; timber, sash and bay windows cost more.
Triple-glazed windows have better soundproofing and enhanced insulation in comparison to double-glazing. This leads to lowered energy expenses and increased warmth in the winter months.
Some manufacturers even say they the improved energy efficiency may reduce heating bills by up to 50%, However, they come at a higher cost, typically 10-20% more than double glazing.
In this guide, you’ll find out how the current triple glazing costs by window type (sash, casement, tilt and turn, bow) and by type of property (apartment, house, semi and more).
Triple glazing involves three layers of glass separated by gas-filled spaces within a window frame. The layers are divided by spacer bars to enhance insulation and energy efficiency compared to single or double glazing.
- Triple glazing provides a level of efficiency that is six times greater than that of single-glazed windows.
- Triple glazing is between 30-50% more expensive than double glazing.
- The average per square meter cost of triple-glazed windows tends to be approximately £375-£450.
- A triple-glazed uPVC casement window can cost anything between £390 to £495 per window.
- Triple-glazing a two-bedroom, small terraced house with 5 windows will cost around £2,200-£2,700.
Compare Window Prices
Get quotes from local installers
1 fast form = 4 low quotes
Save up to £703 per year
Average Triple Glazed Windows Costs By Window Type
Triple glazing offers superior sound reduction for those living in areas with high noise pollution. Its other benefits also include increased indoor heat from harsh winters, added home security, and minimised condensation accumulation.
Opting for the installation of triple-glazed windows in your home enables a reduction in your home’s CO2 emissions. Not only would this lessen your carbon footprint but this can also create up to a 50% decrease in your heating bills.
The cost of triple-glazed windows will depend on other factors like design, size, and frame material. Installation costs can also vary by location.
Average Cost of Triple-Glazed uPVC Windows
uPVC, short for Unplasticized PolyVinyl Chloride, stands out as one of the most cutting-edge materials in window frame construction.
If the expense of triple glazing concerns you, opting for uPVC triple windows gives you the best of both worlds – affordability and high efficiency.
| Material | Type of Window | Price Range- Low | Price Range- High |
| uPVC | Casement | £390 | £495 |
| | Tilt and Turn | £715 | £900 |
| | Sash | £780 | £1,125 |
| | Bay (3 panels) | £1,560 | £2,025 |
To give you more of an idea of how window size can affect the price of triple-glazing your windows, the table below shows the estimated prices of triple-glazed uPVC casement windows.
| Window Size (mm) | Price per window | Average Price Per Window |
| 600x900mm | £225 – £925 | £575 |
| 900x1200mm | £280 – £995 | £640 |
| 1200x1200mm | £325 – £1,155 | £740 |
Average Cost of Triple-Glazed Wooden Windows
Wooden windows are often on the more expensive side because of their aesthetic appeal and natural availability. They also offer low energy loss and are durable and enduring.
| Wood | Casement | £950 | £1,115 |
| | Tilt and Turn | £1,060 | £1,350 |
| | Sash | £1,170 | £1,690 |
| | Bay (3 panels) | £2,340 | £3,350 |
Average Cost of Triple-Glazed Aluminium Windows
| Aluminium | Casement | £780 | £900 |
| | Tilt and Turn | £900 | £1,125 |
| | Sash | £975 | £1,410 |
| | Bay (3 panels) | £1,545 | £2,535 |
Average Cost of Triple-Glazed Windows by Property Type
The size, design, location and architecture of your property can affect the complexity of the window installation.
It’s essential to consider these factors and consult with window professionals to get accurate quotes based on your specific property type. The complexity, quantity, and customization requirements associated with your property can impact the final price of triple glazing.
| Type of Property | Number of Windows | Number of Bedrooms | Estimated Cost |
| Apartment | 4 | 2 | £1,850-£2,150 |
| Small Terraced House | 5 | 2 | £2,200-£2,700 |
| Medium Semi-Detached House | 7 | 2 | £3,000-£3,500 |
| Large Semi-Detached House | 9 | 3 | £4,000-£4,500 |
| Medium Detached | 12 | 3 | £5,600-£6,100 |
| Large Detached | 15 | 4 | £7,000-£7,500 |
Take Note
The cost of a triple-glazed window is influenced not just by the glazing material but also by factors such as frames, hardware, and more.
Triple glazing, being approximately 30% heavier and thicker than double glazing, plays a crucial role in selecting frames and hardware capable of supporting the additional weight, affecting your overall window cost.
Factors affecting the cost of a triple-glazed window
The initial costs are determined by the property’s size and the scope of work, but window fitters may charge more due to additional factors. These could involve:
Number of Windows
One of the biggest factors affecting the cost per window is the number of windows being installed. If you triple-glaze more windows in one go, this will result in a lower per-unit price.
Frame Style
Casement
Casement windows are the most versatile style of frame in the UK.
The average cost of triple glazing a uPVC casement window is estimated to range between £390 to £495 per window. This would also depend on the size and number of windows being replaced.
Tilt and Turn
These types are popular because they allow windows to open in several directions and be securely left open on a tilt for ventilation.
Tilt and Turn windows typically cost 25% more than casement windows.
Sash
Sash windows are often found in traditional houses as they suit period pieces and add significant property value.
Due to the weight of triple glazing making sash windows harder to close, installing triple-glazed sash windows is often double the price of casement windows.
Bay
These windows are suited for houses with a great outside view as they offer an extra panoramic viewpoint from the projecting window.
With its three-panelled style, a triple-glazed bay window can be up to 150% more than a casement window.
Installation Requirements
If using scaffolding or obtaining additional planning permission for certain window types such as installing triple-glazed bay windows is required for window installation, this could increase the costs for triple glazing.
Frame Material and Colour
Triple glazing is often more expensive because you need thicker frames that can support the weight of the three glass layers and provide proper insulation to maximise energy efficiency. Your chosen frame colour is also another added factor to the price as certain colours like white are generally cheaper over woodgrain or grey.
Waste Removal
Waste removal of windows refers to the process of collecting, transporting, and disposing of discarded or old windows in a responsible and environmentally friendly manner.
If you need your old windows to be removed, consider requesting the contractor to include waste removal costs in their quotation.
Double glazing vs triple glazing cost comparisons
Typically, triple glazing is priced 30-50% higher than double glazing. On average, a triple-glazed window begins at approximately £390, whereas a double-glazed window costs around £225.
Triple-glazing window frames are also approximately 30% heavier and significantly thicker than double-glazing frames and would be more expensive.
Consider This:
An innovative alternative to triple glazing is double glazing with an inserted thin film glaze at the mid-point of the unit. The CUIN glass delivers comparable performance to triple glazing but at a more affordable cost and with 33% less glass. Presently, only a limited number of suppliers in the UK offer this option.
Should you invest in triple-glazing your home?
To get the most out of triple glazing, you have to be ready for the financial investment that comes with it. But once it’s in, you’ll feel the difference in a big way – no more annoying draughts that trigger your allergies, less condensation, top-notch home insulation, and as a bonus, your energy bills will start going down.
Whether it’s drowning out noisy neighbours, staying toasty in winter, or just increasing your home security, triple-glazing those windows could be just the home upgrade you need.
Do triple glazing costs vary by location?
Yes, the cost of triple glazing can vary by location due to factors such as regional labour rates, availability of materials, and local market conditions.
Are there government incentives or grants available to offset triple-glazing costs?
In some regions, there may be government incentives, rebates, or grants available to encourage energy-efficient upgrades, including triple glazing. Check with local authorities or energy agencies for potential programs.
Can I save money in the long run with triple glazing?
While triple glazing has a higher upfront cost, it can lead to long-term savings on energy bills due to improved insulation. Consider the potential energy efficiency benefits when evaluating the overall cost.
Can I negotiate the cost of triple glazing with suppliers?
It’s often possible to negotiate the cost, especially if you are obtaining quotes from multiple suppliers. However, be sure to consider the overall value and quality of the product and installation
How much can I save with triple-glazed windows?
In contrast to single-glazed windows or outdated double-glazed windows, triple-glazing has the potential to cut your energy bills by up to 50%. In a detached home in the UK, triple-glazed windows could result in approximately £175 in annual savings on heating bills depending on the window’s energy efficiency rating.
Now read:
Written By
Reviewed By
