Thinking about replacing your windows?
Double glazing is one of the most popular home improvements in the UK. It can improve energy efficiency, reduce outside noise, enhance security and even increase your property’s value.
But how much should you expect to pay?
In 2026, replacing double glazed windows typically costs between £500 and £1,500 per window, while a whole-house installation usually ranges from £5,000 to £15,000, depending on the size of your home and the type of windows you choose.
Here’s everything you need to know before requesting quotes.
Double glazing costs at a glance
| Window type | Estimated 2026 cost |
|---|---|
| uPVC casement window | £500–£900 |
| uPVC sash window | £800–£1,400 |
| Aluminium window | £800–£1,500 |
| Timber window | £900–£1,800 |
| Bay window | £1,500–£3,500 |
| Patio doors | £1,500–£3,500 |
| Bifold doors | £3,000–£8,000+ |
These prices usually include supply and installation.
How much does it cost to replace all the windows in a house?
Here’s a rough guide:
| Property | Average cost |
|---|---|
| 1-bedroom flat | £3,000–£5,000 |
| 2-bedroom house | £4,500–£7,000 |
| 3-bedroom house | £6,000–£9,500 |
| 4-bedroom house | £8,000–£12,500 |
| Large detached home | £12,000–£20,000+ |
The final cost depends on the number of windows, their size and the materials you choose.
What affects the price?
Window material
The material you choose has the biggest impact on cost.
uPVC
The UK’s most popular option.
Advantages:
- Affordable
- Low maintenance
- Energy efficient
- Long lifespan
Best for homeowners looking for value.
Aluminium
A premium option offering:
- Slim modern frames
- Exceptional durability
- Minimal maintenance
- Contemporary appearance
Expect to pay more than for uPVC.
Timber
Timber windows offer a traditional look that’s ideal for period properties.
However, they require more maintenance and are generally the most expensive option.
Window style
Different styles cost different amounts.
Popular options include:
- Casement windows
- Sash windows
- Tilt and turn windows
- Bay windows
- Flush casement windows
Larger or more complex designs naturally cost more.
Glass specification
Standard double glazing is suitable for most homes.
However, you can also choose:
- Triple glazing
- Acoustic glass
- Toughened safety glass
- Obscure privacy glass
- Solar control glass
These upgrades increase the overall price.
Is double glazing worth it?
For most homeowners, yes.
Benefits include:
✔ Lower heat loss
✔ Reduced outside noise
✔ Improved home security
✔ Less condensation
✔ Better EPC rating
✔ Improved kerb appeal
It’s one of the few home improvements that improves comfort while potentially reducing energy bills.
How long does installation take?
Most installers can replace:
- 2–4 windows in a day
- A typical three-bedroom house in 2–3 days
Larger properties may take longer.
Can double glazing increase your home’s value?
While there’s no guaranteed increase in value, modern double glazing can make a property more attractive to buyers.
Many buyers expect homes to have:
- Energy-efficient windows
- Good insulation
- Low maintenance
- Modern appearance
Replacing old single-glazed windows can improve both kerb appeal and buyer confidence.
Can you get government funding?
Some homeowners may qualify for support through energy-efficiency schemes, depending on:
- Household income
- Property type
- Location
- Eligibility criteria
It’s worth checking available grants before paying for the work yourself.
Hidden costs to watch for
Before accepting a quote, ask whether it includes:
- Removal of old windows
- Waste disposal
- Internal finishing
- External sealing
- Scaffolding (if required)
- Trickle vents
- Safety glass
- VAT
A cheaper quote isn’t always the best value if important items have been excluded.
How to save money
Compare at least three quotes
Double glazing prices can vary significantly between installers.
Never accept the first quote without comparing alternatives.
Choose the right material
If you’re on a budget, uPVC usually offers the best balance of cost, durability and energy efficiency.
Replace all windows together
Many installers offer better prices when replacing multiple windows during the same visit.
Check guarantees
Look for installers offering:
- Product warranty
- Installation guarantee
- Insurance-backed guarantee
This provides extra peace of mind if problems arise later.
Frequently Asked Questions
Is double glazing worth the money?
For most homeowners, yes.
It improves comfort, reduces heat loss and can lower energy bills over time.
How long do double glazed windows last?
Quality double glazed windows typically last 20–35 years, depending on the materials and maintenance.
Is triple glazing better?
Triple glazing offers additional insulation but isn’t always necessary for every UK home.
Many homeowners find that modern double glazing provides excellent performance at a lower cost.
When should I replace my windows?
Signs include:
- Condensation between the panes
- Draughts
- Difficulty opening or closing
- Rotting frames
- Rising heating bills
- Visible damage
Final thoughts
Replacing your windows is a significant investment, but it’s one that can improve your home’s comfort, energy efficiency and appearance for decades.
Whether you’re replacing a single window or upgrading your entire property, comparing several quotes and choosing a reputable installer can save you thousands of pounds.
Take the time to compare materials, guarantees and customer reviews before making your decision.
Find a trusted double glazing installer
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Author: manager
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