If you’re considering upgrading your windows, the first thing you may ask is: how much are double-glazed windows likely to cost you.
The truth is, there’s no straightforward answer. The price of getting double-glazed windows depends on many factors. It can at first appear quite expensive, but a new double glazing installation can over time prove worthwhile through the energy bill savings.
In this guide, we explain the average cost of double-glazed windows and the factors that affect the final price.
What Are Double-Glazed Windows?
Double-glazed windows are any type of window with two panes of glass. The panes are separated by a layer of gas, and the whole thing is sealed within a single frame. The gas layer is what makes double-glazed windows so effective.
During the winter, double glazed units keep warm air inside your property. Meanwhile, during the summer, it can reduce the hot air entering from outside. The result is a more comfortable indoor environment with improved energy efficiency and improved noise reduction.
Thanks to the benefits, double-glazed windows are now a standard within new homes in Scotland. These windows are one of the most popular upgrades for homeowners looking to lower their energy bills.
How Much Are Double-Glazed Windows?
As per the Federation of Master Builders, the starting price for double-glazed windows typically starts at £500 per window. This price can increase to £1,500 or more depending on size, style, and materials.
Below is a side-by-side comparison of the standard sizes of a casement window frame as of June 2026.
| Material | 600 mm x 900 mm | 900 mm x 1,200 mm | 1,200 mm x 1,200 mm |
|---|---|---|---|
| uPVC | £525 | £615 | £670 |
| Aluminium | £700 | £800 | £870 |
| Timber | £1,630 | £1,850 | £1,975 |
Furthermore, the type of window frame also affects the price. Below is a comparison of the most affordable prices based on window type.
| Window Type | uPVC | Aluminium | Timber |
|---|---|---|---|
| Casement Window | £525 | £700 | £1,630 |
| Sash Window | £805 | £1,050 | £2,450 |
| Bay Window | £1,755 | £2,265 | £5,265 |
| Bow Window | £1,815 | £2,265 | £5,435 |
| Tilt and Turn | £670 | £875 | £2,040 |
The prices might seem scary at first. However, upgrading to double-glazed windows has its many advantages.
According to the Energy Saving Trust, getting double-glazed windows saves a typical Scottish household around £140 per year on energy bills. That’s equivalent to £2,800 over the course of a 20-year lifespan based on current energy prices!
Factors That Affect Double-Glazed Window Cost
There are many factors affecting the cost of double-glazed windows. The price can vary depending on your circumstances and this is why getting a personalised quotation from your supplier is the best option.
To help you understand the cost, here are the factors window installers must consider.
Window Size
One of the biggest factors to consider is the price. In general, the bigger the window, the costlier it’ll be. This is because larger windows require bigger frames and more glass.
Standard-sized windows are typically the most affordable because they are manufactured efficiently.
Watch out for older homes with custom-sized windows. Some properties may require bespoke measurements, which add to the cost.
A few homeowners may try to cut costs by fitting standard windows into a slightly bigger frame. That said, getting the right window size is crucial. Ensuring the perfect fit maximises energy efficiency and prevents any cold draughts.
Frame Material
The window frame’s material has a significant impact on the final price. Different materials vary in durability, appearance, and maintenance. It’s important to choose which one is suitable for you.
- uPVC: uPVC windows Glasgow are the cheapest and most popular option for homeowners in Scotland. It offers value for money, requires little maintenance, and provides ample thermal performance.
- Aluminium: Aluminium Glasgow windows are slightly more expensive than uPVC. Their advantage is better durability and corrosion resistance.
- Timber: Timber frames are the most expensive due to the craftsmanship that goes into them. However, they have a timeless appearance that goes well with older architectural styles.
Window Style
The style of window you choose also affects the overall price. Different types of windows require varying amounts of materials. Plus, each has its own manufacturing time and installation expertise requirements.
- Casement Windows: Casement windows are the most affordable because of their simplicity. You can find these types of windows in homes throughout Scotland.
- Sash Windows: Sash windows have a more traditional appearance, making them ideal for older homes. The sliding mechanism in sash windows is what adds to the cost.
- Bay and Bow Windows: These windows are often the most expensive since they project outside the property. In exchange, you get an extra nook where you can relax and enjoy the views.
Glazing Specifications
Not all double-glazed windows are the same. Some windows have added features that improve their performance.
For instance, homeowners may choose toughened or laminated glass, which offers better security. In other cases, you may also choose reflective glass for better thermal insulation. These upgraded glazing options add to the cost, but they can improve comfort and security within your home.
Labour
Installation costs vary based on the scope of the project. The condition of your existing windows can add to labour costs.
For example, installers may need to remove or repair damaged frames. Additional brickwork or adjusting frame sizes can also inflate the price.
Regardless, professional installation is always recommended when you’re getting new double-glazed windows. Although they add to the cost, professional installers ensure your windows are installed correctly and meet Building Regulations.
Property Layout
Few people realise this, but property layout is a huge contributor to cost.
Is the window on the first or second floor? Is your home located further away in a more remote area? Your installer must consider logistics and any extra equipment for completing the project.
Heritage Properties
Lastly, replacing windows in heritage properties may be costlier. Heritage properties have historical significance. Therefore, you may need to preserve its original appearance.
Expenses for heritage properties can add up. In some cases, you have to pay for permits and architect consultancy fees.
Are Double-Glazed Windows Worth the Investment?
Even though the upfront cost for double-glazed windows is high, they can still be a worthwhile investment. Here’s why you should consider upgrading to double-glazed windows.
Lower Energy Bills
Did you know that 18% of a home’s heat loss happens through the windows? Single-pane windows can only provide low insulation. Your heating system needs to work harder to maintain the ideal temperature.
Double-glazed windows prevent heat loss through glass. Because of this, installing double-glazed windows can save you £120 to £155 per year.
Increased Property Value
Double-glazed windows are modern and energy efficient. They enhance the property’s appearance and assure buyers that they don’t have to upgrade the home in the near future.
Therefore, installing double-glazed windows increases your property’s value.
Improved Comfort
Having a warmer home isn’t the only perk to getting double-glazed windows. Many homeowners notice an overall improvement in a space’s comfort after installation.
Double-glazed windows can help eliminate draughts and cold spots. The indoor temperature becomes consistent. Moreover, noise levels are also reduced, so when you live near a busy road, having double-glazed windows creates a quiet and relaxing environment.
Reduced Maintenance
Unlike old windows, double-glazed windows are easier to maintain. The added insulation prevents condensation from building up, so windows require less cleaning.
What’s more, uPVC and aluminium windows don’t require regular cleaning. Overall, having double-glazed windows means less maintenance for you.
Tips for Saving on Double-Glazed Windows
Getting new double-glazed windows doesn’t have to be expensive. There are several ways to keep the costs down without compromising on quality.
- Compare Multiple Quotes: It’s best to compare prices between installers in your area. This way, you can evaluate specifications, warranties, and services before making a decision.
- Choose Standard Windows: Standard windows are generally more affordable than bespoke ones. Don’t worry. Standard uPVC and aluminium windows come in many designs and colours.
- Replace All Windows at Once: Costs can add up when you replace windows one-by-one. You can get bigger discounts when you replace all your windows at once.
- Check for Finance Options: Ask your supplier whether they offer finance packages. This can spread the cost over a longer period.
- Avoid Unnecessary Upgrades: Some suppliers may try to upsell their products. In reality, features like decorative glazing or special finishes are not necessary.
- Work With a Reputable Installer: Working with experts like MLR Maintenance ensures your windows are fitted correctly. You can avoid costly damages, reduce the risk of future issues, and enjoy greater peace of mind.
Final Thoughts
So, how much are double-glazed windows? The answer depends on the window size, material, specifications, and other factors.
In general, double-glazed casement windows start at £500. The price can go up to £1,500 or more, especially if you have large bay windows.
Still, upgrading to double-glazed windows is worth the investment. Double-glazed windows have better insulating properties, which lowers your energy bill. They can also reduce noise, improve security, and make your home feel more comfortable.
If you’re looking for new double-glazed windows, be sure to reach out to fill out our form for a free quote. Our expert team is here to guide you through the whole process!