Homeowners often want clear guidance on double glazed windows cost in the UK, especially when choosing the right frame, size, and style.
If you’re planning to install uPVC double glazed windows in Glasgow, understanding pricing factors can help you make a smart decision and avoid overspending.
This guide explains everything in a simple way — from costs to materials and money-saving tips.
What Affects the Cost of Double Glazed Windows?
Several factors influence the total price of double glazing installation:
1. Frame Material
The material you choose plays a big role in cost and performance:
- uPVC windows – Most affordable, energy-efficient, low maintenance
- Aluminium windows – Strong and modern but more expensive
- Timber windows – Premium look, excellent insulation but high cost
Your window cost varies according to frame material. Frame material can be upvc, timber, or aluminum. uPVC window frames offer durability and insulating properties at affordable rates and require a little upkeep. On the other hand, aluminum windows offer more window support and are stronger material. But, at the same time, they are costly and don’t offer maximum insulating properties.
💰 Average cost per window (UK):
- uPVC: £500–£700
- Aluminium: £700–£1,000
- Timber: £1,000–£1,500
Above all, the most expensive window frame is timber. Timber offers excellent insulation and enhances the curb-appeal of your place. But, it requires more upkeep as compared to upvc or aluminum. Approximately, you’ll need £525, £800, and £1200 to install a upvc, aluminum and timber window. Some window frame material is made by combining two materials to get benefits of both.
2. Window Style
Different styles come at different prices:
- Casement windows – Most affordable
- Fixed windows – Budget option (non-opening)
- Tilt & turn / sash windows – Mid to high range
- Bay & bow windows – Most expensive
Price of the window also varies depending upon the style of window. Casement windows and fixed windows are the most economical options. You can’t open fixed windows, while casement windows can be opened from one side. However, tilt and turn windows and sliding sash windows can be opened from multiple points and hence are more expensive options. Above all, bay and bow windows are the most expensive window styles because of their advanced features.
3. Window Size
Larger windows require more materials and labour, increasing the cost.
4. Glass Type
Your glazing choice affects both price and performance:
Laminated glass – Noise reduction + UV protection
Standard double glazing – Basic option
Low-E glass – Better insulation
Toughened glass – Safer and stronger
5. Number of Windows
Installing multiple windows can reduce cost per unit due to bulk discounts and shared labour costs.
Because, you may get huge discounts, if you book windows in bulk. Similarly, the installation cost will also go in your favor. As you don’t have to pay the full installation fee separately for each window. More importantly, your time and energy will be saved.
Why buy double glazed windows?
Double glazed windows are durable with an average life of 20 years. These windows offer your place thermal insulation and make it sound proof, reducing your annual energy bills. However, triple glazed windows are better in insulation and soundproof ability than them. But they are more expensive. So, double glazed windows are a better option at an affordable rate.
Average Cost of Double Glazed Windows in the UK
- 3-bedroom house (uPVC): £4,000 – £6,000
- Per window average: £400 – £700
- Installation cost: £40 – £150 per window
Prices vary based on size, style, and materials.
Which type of double glazing is best?
In double glazing, an additional pane is placed to enhance insulation and sound-proof ability. There can be various types of double glazed glass panes. Low-emissivity glass with a coated microscopic layer offers greater insulation to your place as compared to regular glass.
Toughened glass lessens the chance of injury if it is broken. Thus, it is way more strong and safe than regular glass panes. Laminated glass has a plastic layer between two glass panes , thus enhancing the ability of sound-proof and protection from UV.
You can choose double glazed windows in upvc, aluminum uk or timber frame material. Cost will vary according to frame material. However, upvc would be the most pocket friendly.
How much do energy-efficient double-glazed windows cost?
Definitely, energy efficient double glazed windows will reduce overall annual energy bills. You can increase the energy efficiency of your place by filling argon gas between glass panes, using low-emissivity glass coating on your window, or by installing triple glazed glass panes.
But, they will be a bit more expensive options. Filling of argon gas between glass panes and use of low-emissivity glass will cost you $120-$2500, individually.
What is the price to double glaze a house?
First of all, decide that you’ve to replace all the windows or some specific windows in your place. Because, it will impact overall pricing of window installing. If all the windows in your home are old and don’t provide you insulation and safety, you should replace them all.
However, at times some of the windows don’t function, for example windows on the outside stop working properly because of their continuous exposure to extreme weather conditions. In this case, you should install only impaired windows to save your money.FENSA Certainly, it will cost you more to install all the windows altogether.
You can also install triple glazed upvc windows for extra sound-proofing, and insulation. These triple-glazed windows are an ideal choice in cold areas in the UK.
Average Cost of Double Glazed Windows in the UK
- 3-bedroom house (uPVC): £4,000 – £6,000
- Per window average: £400 – £700
- Installation cost: £40 – £150 per window
Prices vary based on size, style, and materials.
Why Choose Double Glazed Windows?
Double glazing offers several benefits:
- Better thermal insulation
- Reduced energy bills
- Improved soundproofing
- Increased property value
- Long lifespan (20+ years)
👉 Triple glazing offers better insulation but costs more.
Which Double Glazing Type Is Best?
The best option depends on your needs:
- Low-E glass – Best for energy efficiency
- Argon gas-filled units – Improved insulation
- Toughened glass – Safety
- Laminated glass – Noise reduction
For most homes, uPVC double glazing is the most cost-effective solution.
Replacement Window Costs
Replacing existing windows typically costs:
- £200 – £600 per window
This depends on condition, size, and installation complexity.
Can You Install Double Glazed Windows Yourself?
DIY installation is possible but not recommended.
Professional fitting ensures:
- Proper sealing
- Energy efficiency
- Compliance with UK regulations
Money-Saving Tips
Hire FENSA-registered installers
Choose uPVC frames for affordability
Compare quotes from multiple companies
Install multiple windows at once
Choose simple styles like casement
Useful double glazing checklist
- First of all, decide how many windows you’ve to install.
- You can install cheap window styles such as casement for the back, and big-sized expensive window styles in the front to enhance curb-appeal of your place.
- Get consultation from a professional about which double glazing you should opt for your place.
- Go to 4-5 companies to get a more reasonable price in the market.
- Choose the company for installation that offers you some special discount.
- Buy windows and hire professionals from a FENSA registered trade company.
Conclusion
The cost of double glazed windows in the UK depends on several factors including frame material, size, style, and installation.
For most homeowners, uPVC double glazed windows offer the best balance of cost, durability, and energy efficiency.
If you’re in Glasgow, investing in modern double glazing can significantly improve comfort and reduce long-term energy bills.
FAQ:
What is the average cost of double glazed windows in the UK?
The average cost is £400–£700 per window, depending on size and material.
How much does it cost to double glaze a 3-bedroom house?
Around £4,000–£6,000 for standard uPVC windows.
Are uPVC windows the cheapest option?
Yes, uPVC windows are the most affordable and energy-efficient option.
Is it worth replacing old double glazing?
Yes, replacing old windows improves insulation and lowers energy bills.
