Double Glazing Cost
What Are Double Glazing Costs in 2025? How Much Does Double Glazing Cost? Average Double Glazing Prices 2025 Are your energy bills too high? Check your windows. Around 10 – […]
Double Glazing
What Are Double Glazing Costs in 2025?
How Much Does Double Glazing Cost? Average Double Glazing Prices 2025
Are your energy bills too high? Check your windows. Around 10 – 20% of all heating bills are lost due to old, leaky, inefficient windows. Whilst 93% of homes in the country have double glazing, not all of them are the same quality. Installing high quality, Grade A+ new double glazing windows can block up to 75% of heat from leaving your home, slashing up to 15% of your heating bills.
But how much does double glazing cost for a UK household in 2025? The answer to this question has both a short and long answer, and Double Glazing On The Web will answer both in detail throughout this article.
How much does the average double-glazing cost?
Below are the average double-glazing costs per window:
| Window Type | Average Cost (£) |
| Casement Windows | £500 – £1,250 per window |
| Sash Windows | £700 – £1,500 per window |
| Sliding Windows | £600 – £1,400 per window |
| Tilt and Turn Windows | £600 – £1,400 per window |
| Bay Windows | £1,100 – £4,000 per window |
| Bow Windows | £1,500 – £5,000+ per window |
Whilst the above table displays the average double glazed window costs, it only takes window type into account. The pricing of double glazed windows depends on four things:
- Window type – As displayed above.
- Window material – Your window frames aid in thermal insulation and security efforts. uPVC windows are the most popular due to their high resistances and low price points.
- Glazing quality – Not all double-glazing is made equal. Quality is rated via the window energy rating, from G – A+ (A++ for triple glazing).
- Window size – Window sizes can be between 500mm x 500mm to 1200mm x 1200mm in size, with the larger options being relegated to specialised formats – such as floor to ceiling or bay windows.
With this in mind, let’s go over each point in detail.
How much does the material of double glazing cost?
When it comes to double glazing, the main format you’ll find them in are uPVC casement windows. uPVC is one of the main reasons double glazing became standard, as beforehand, frames were too fragile and poorly insulated to justify the cost of double glazing. uPVC, however, was cheap to manufacture and boasted fantastic heat insulation qualities, fast becoming the number one material for window frames on the market.
The following are the cost ranges of window frame material:
| Cost Range per Window | |
| uPVC Windows | £150 – £450 |
| Aluminium Windows | £744 – £1,147 |
| Timber Windows | £850 – £1,200 |
| Composite Windows | £2,046 – £3,596 |
How much does double glazing cost by quality?
The quality of your double glazing is determined by window energy rating (WER). WER grades the energy efficiency of your window, meaning it determines how much heat loss your windows can prevent. For an idea of the power of each grade, take a look at the table below:
| Energy Rating | Heat Loss Prevented |
| G | 0.00% |
| F | 18.20% |
| E | 30.90% |
| D | 41.80% |
| C | 50.90% |
| B | 63.60% |
| A | 70.90% |
| A+ | 76.40% |
| A++ | 85.50% |
All double glazed windows are ranked by this. What determines high grade revolves purely around the components added to the window to improve energy efficiency.
The following are a breakdown of the minimum of what makes each grade, as well as their components.
- G-Rated Windows
- F-Rated Windows
- E-Rated Windows
- D-Rated Windows
- C-Rated Windows
- B-Rated Windows
- A-Rated Windows
- A+-Rated Windows
- A++-Rated Windows
- Glazing type – Single-glazed windows (£150).
- Frame material – Basic uPVC (£100).
- Gas fill – None.
- Coating – None.
The absolute lowest grade of window. Single-glazed windows are laughably below standard, as the outside pane and inner pane are the same – speeding up heat transfer with nothing in the way of insulation. You can expect to lose your heating at high rates.
- Glazing type – Single-glazed windows.
- Frame material – Basic uPVC.
- Gas fill – None.
- Coating – None.
Not a lot better than the previous entry. Higher quality materials used in the construction can achieve the 18.20% boost, but it doesn’t account for much in the end.
- Glazing type – Double-glazing windows.
- Frame material – Basic uPVC.
- Gas fill – Air.
- Coating – None.
E-rated windows are the lowest quality of double glazing. Blocking 30% of heat, these typically only exist as pre-existing double glazed windows, as they are outdated.
- Glazing type – Double-glazing windows.
- Frame material – Basic uPVC.
- Gas fill – Air.
- Coating – None.
D-rated windows typically are not much different than E-rated windows, other than thicker glass or better sealing.
- Glazing type – Double-glazing windows.
- Frame material – Basic uPVC.
- Gas fill – Air.
- Coating – Basic low-e coating.
Coatings are a surface layer placed on the interior of double-glazed windows. In the case of low-e (emissivity) coating, heat loss is reduced by reflecting it back into the room. Typical cost: £500 to £1,100.
- Glazing type – Double-glazing windows.
- Frame material – Basic uPVC.
- Gas fill – Argon.
- Coating – Basic low-e coating.
Argon gas has superior thermal insulation than air, meaning heat transfer is reduced by a large degree. This is a strong mid-range option. Typical cost: £600 to £1,400.
- Glazing type – Advanced double-glazing windows.
- Frame material – Multi-chambered uPVC.
- Gas fill – Argon.
- Coating – Soft coat low-e coating.
There’s much more going on with these types of windows. A-rated windows are arguably the biggest gap in quality amongst all double-glazing windows. First and foremost, the “advanced” double glazing type consists of 4mm low-e glass panes, with a 16mm cavity filled with argon gas. The change in glass type and increase in distance between panes means the construction itself is different. Furthermore, there’s also a warm-edge spacer bar, a component that would otherwise have no insulation ability. Typical cost: £600 to £1,800.
- Glazing type – Advanced double-glazing windows.
- Frame material – Aluminum frame with thermal break.
- Gas fill – Argon.
- Coating – Soft coat low-e coating.
A+-rated windows have wider cavities, from 16mm to 20mm, and an aluminium frame is stronger, longer lasting and offers more thermal insulation. Typical cost: £700 to £1,800.
- Glazing type – Advanced triple-glazing windows.
- Frame material – Aluminium frame with thermal break.
- Gas fill – Krypton.
- Coating – Soft coat low-e coating on both panes.
Triple-glazing is not an automatic upgrade to A++, in fact you can easily have one be much lower. But an A++ window cannot be double-glazed. These windows require krypton, more advanced than argon gas, between their window panes, as well as high quality timber frames, or composite frames, that maximise insulation. Typical cost: £1,000 to £2,500.
What is the installation cost of double glazing?
We don’t recommend even attempting DIY double glazing installation unless you’re already a professional in the trade. That being said, this is usually added to the cost of double glazing rather than being separate.
The following is a breakdown on the average double glazing cost of installation:
- Labour costs – Installing double glazing usually requires two professionals rather than one, hiking the price up. This means that you can expect to pay around £500 per day.
- Hourly rate – Those who charge on hourly rates typically charge between £25 to £35.
The installation time frame consists of:
- Per window – Per window, replacing windows with new double glazed windows typically takes around 45 minutes per window, with more complicated windows (like bay windows) taking longer.
Overall, how much you pay depends on how many windows you’re having installed.
Ways to Save Money on New Windows
Replacement home windows aren’t cheap, but there are ways to minimise your costs:
- Shop around – Different installers have different rates. Fill out our quick, no-obligation form – we’ll take details of what you’re looking for, and match you with window professionals within those parameters.
- Time your task right – Aim for the sluggish season in autumn through early spring. Companies would possibly have special offers due to a slower period for double glazing companies.
- Look for promotions – Many window brands provide rebates or income during certain periods.
- Choose mid-variety options – Premium windows are high priced. You can get excellent exceptional for a decreased price with vinyl or fibreglass frames and double-pane glass.
- Consider financing – Many window companies offer charge plans. Compare interest quotes and terms to discover the nice deal.
To find the best deals on double glazing prices, obtain multiple quotes and compare them, considering factors like door styles, materials, and installation fees.
Buying new double glazing – is it worth the cost?
How much will it cost to update your windows in 2025? The answer is annoying but true – it depends. Depends on your needs, how much of an upgrade your new double glazing will be over the last, and how many windows you need.
Yes, new windows aren’t cheap – but they are not an expense, they are an investment. A new appearance is the least of what you’ll gain from the cost of double glazing; improved energy efficiency and comfort are far more important benefits. Over time, the reduction in energy bills will eventually chip away the price you have already paid.
Another thing to consider is property value. There is a lot that goes into property value, and one of the biggest factors is functionality. A property with low running costs equals a property with high functionality.
FAQ – How Often Should I Get New Windows?
The average lifespan of double-glazing windows depends entirely on the material it’s fabricated from. Average lifespans include:
- uPVC Windows: 20–35 years
- Wooden Windows: 15–30 years (requires regular maintenance)
- Aluminium Windows: 30–45 years
- Composite Windows: 40+ years
That being said, whether or not you wait the full lifespan or not depends on the window’s efficiency. Double glazed windows lose bits of their heat reduction ability over time. This process is rapidly sped up in cases of cracks in the window pane, as this will cause the insulating material to leak.
Signs you need new windows include:
- Draughts – Draughts mean either the glass or window frame have a gap somewhere letting heat out, compromising your heat retention goals. Identify where the draught is coming from properly, as it may be that you need only replace weatherstripping, caulk, or adjust the window.
- Condensation between panes – If there is condensation between the panes, then your double-glazing has a broken seal and it’s no longer functioning as an insulating barrier. Replace it entirely.
- Visible damage – If damage causes structural damage, there’s little you can do but replace the window. Otherwise, if it can be patched or filled, do so immediately.
- Excessive noise – Seal gaps around the window if they’re letting in noise.