Most people come to us with the same question first.
Not about style, not about colour, not about frames. Just: how much is this going to cost?
It is a completely fair place to start. Double glazing is not a small purchase. Done right, it improves your home’s warmth, cuts your energy bills, and adds real long-term value. Done badly, or with a cheap installer, it can cause problems that cost more to fix than the windows themselves.
So let’s give you an honest answer.
What Does Double Glazing Actually Cost in 2026?
For most UK homeowners, double glazing costs between £700 and £1,800 per window installed. That figure covers supply and installation for a standard uPVC casement window.
For a full house, the realistic range is:
| Property Type | Typical Cost Range |
| Small flat, 3 to 4 windows | £2,500 to £4,000 |
| Terraced house, 5 to 7 windows | £4,000 to £6,500 |
| Semi-detached, 8 to 10 windows | £6,000 to £10,000 |
| Detached, 10+ windows | £10,000 upwards |
These are realistic guide prices, not best-case estimates. The only way to get a precise figure for your home is with a proper double glazing quote, because every property is different.
What Affects the Cost of Double Glazing?
Understanding what drives the price helps you make a smarter decision. There are four main factors.
1. Window Style
Different styles carry different price points because of the complexity involved in manufacturing and fitting them.
Casement windows are the most common style in the UK and the most cost-effective. A straightforward hinged design, reliable, and suits most property types.
Tilt and turn windows cost more because the mechanism is more involved. They are popular in flats and newer builds where ease of cleaning matters.
Bay windows sit at the higher end of the scale. They involve multiple frames, more installation time, and sometimes structural considerations too.
Sash windows are a popular choice for period properties. They require more precision to manufacture and fit correctly, particularly in conservation areas where the look needs to be right.
2. Frame Material
Material is where you will notice some of the biggest pricing differences.
uPVC windows remain the most popular option in the UK for good reason. They are cost-effective, require very little maintenance, perform well thermally, and last a long time when properly installed. For most homes, uPVC is the right choice.
Aluminium windows cost more but offer a slimmer profile and a more contemporary finish. They work well on modern homes and extensions where the aesthetic matters as much as the performance.
Timber is the premium option. It looks beautiful, especially on older or traditional properties, but it costs significantly more and needs more upkeep over its lifetime.
3. Number of Windows
Replacing multiple windows at once tends to reduce the cost per window. The fixed costs of a visit, setup, and disposal get spread across more units.
If you are only replacing one or two windows, you will typically pay more per window than someone replacing eight. It is worth factoring this in when deciding whether to do the work in stages or all at once.
4. Installation Complexity
This is the factor that surprises most people.
Two houses on the same street can have completely different installation requirements. The age of the property, the condition of the existing frames, access difficulties, whether scaffolding is needed, and the structural state of the surrounding brickwork all affect the final cost.
Older homes often need more preparation work before installation can begin. It does not mean the job is more difficult in a negative sense, just that it takes more time and care to do it properly.
Window Prices by Type: A Quick Reference
| Window Type | Typical Installed Cost |
| uPVC casement | £700 to £1,800 |
| uPVC tilt and turn | £900 to £2,200 |
| uPVC sash | £900 to £2,400 |
| Aluminium casement | £1,000 to £3,000 |
| Bay window, uPVC | £2,000 to £5,000 |
| Timber casement | £1,500 to £3,500 |
Prices include supply and installation. Exact costs depend on size, specification, and your property’s requirements.
Why Do Quotes Vary So Much?
If you have already started collecting quotes, you may have noticed some significant differences. A gap of £2,000 or more between two quotes for the same job is not unusual.
There are three main reasons for this.
Quality of materials: Not all double glazing is made to the same standard. Cheaper profiles, lower-specification glass units, and inferior hardware can all reduce the upfront price while reducing the lifespan of the windows too.
Installation quality: This matters as much as the windows themselves, arguably more. Poor installation leads to draughts, leaks, condensation between panes, and frames that warp or shift over time. A cheaper quote is only good value if the installation is done to a high standard.
What’s included in the quote: Some installers include removal of your old windows, disposal, and full finishing work as standard. Others price these separately. Always check exactly what is covered before comparing figures side by side.
We always recommend asking for a detailed, itemised window quote rather than a single lump-sum figure. It makes comparison much easier.
Will New Double Glazing Save Money on Energy Bills?
Yes, and for most homes the savings are meaningful.
Older single-glazed windows or failing double glazing can account for a significant proportion of a home’s heat loss. Modern double glazed windows with a good energy rating reduce that heat loss considerably, which means your heating system does not have to work as hard.
The Energy Saving Trust estimates that upgrading from single glazing to A-rated double glazing can save between £110 and £235 per year on energy bills, depending on your property type. Over a 20-year window lifespan, that adds up.
Beyond bills, there are other practical benefits: less external noise, fewer draughts, and a more consistently comfortable temperature throughout your home.
Signs It Is Time to Replace Your Windows
Not sure whether you actually need new windows, or just repairs? These are the signs to look out for.
Condensation between the panes. If you can see misting or water droplets sitting between the two panes of glass, the sealed unit has failed. This cannot be fixed without replacing the glass unit itself.
Draughts around the frame. If you can feel cold air coming through even when the window is closed, the seals have gone or the frame has warped.
Difficulty opening or closing. This often means the frame has moved, which is common in older windows where the material has degraded over time.
Rising energy bills. If your bills have crept up without an obvious explanation, failing windows are a likely contributor.
Visible damage or decay. Cracked frames, rot in timber, or visible corrosion on aluminium are clear signals that replacement is overdue.
If you are noticing two or more of these, arranging a free home survey makes sense sooner rather than later.
What Matters More Than Getting the Cheapest Price
This is probably the most important section of this guide.
The cheapest quote is almost never the best value. Windows are one of those purchases where the difference between a good and a poor installation becomes very apparent over time, and where cutting corners upfront tends to cost significantly more to fix later.
What you are actually buying when you invest in double glazing is long-term performance. Good quality windows, properly installed, should last 20 to 30 years with minimal issues. Poor quality windows, or good windows fitted badly, can start causing problems within a few years.
When assessing any quote or installer, it is worth asking:
- Are the windows FENSA certified or covered by an equivalent scheme?
- What guarantee do they offer on both the product and the installation?
- Can they show you examples of previous work in properties similar to yours?
- Is the company local and established?
Why We Think Local Matters
We are a local company, and we think that makes a real difference to the service you receive.
Wednesfield Trade Windows knows the types of properties in this area. We understand the specific challenges that come with period homes, conservation areas, and older construction. We are also here after the job is done, which matters if anything ever needs attention.
We provide windows and doors across Wednesfield and the surrounding areas, including locations such as Wolverhampton, Walsall, Willenhall, Bilston, Dudley and Stourbridge.
We are not here to upsell you on windows you do not need. Our approach is straightforward: we look at your home, understand what will work best, and give you an honest quote with no pressure.
FAQ’s
How much does double glazing cost per window in the UK?
Most double glazing costs between £700 and £1,800 per window installed in 2026. The final price depends on the style, size, material, and your property’s specific requirements. uPVC casement windows usually sit at the lower end, while aluminium, sash, and bay windows tend to sit higher because they require different materials, mechanisms, or installation work.
Is double glazing worth the investment?
For most homeowners, yes. Modern double glazing reduces heat loss, lowers energy bills, improves comfort, and can add value to your property. The savings on energy bills alone can offset a significant portion of the cost over the lifetime of the windows. If your current windows are draughty, difficult to open, misted between the panes, or visibly worn, upgrading to new double glazed windows is often a sensible long-term investment.
Why do double glazing quotes vary so much?
Quotes vary because of differences in material quality, installation standards, and what is included in the price. A low quote may exclude removal of old windows, disposal, finishing work, or higher-quality hardware. It may also use lower-specification frames or glass. Before choosing an installer, always ask for a detailed quote and make sure you are comparing like for like. You can also look at their previous installations to check the standard of their work.
How long does double glazing last?
Good quality double glazing, professionally installed, typically lasts between 20 and 30 years. The sealed glass units may need replacing before the frames do, especially if condensation appears between the panes. Choosing the right window style and material also matters. For example, well-fitted uPVC windows require very little maintenance and are a reliable choice for many homes.
Do I need planning permission for double glazing?
In most cases, no. Replacing like-for-like windows on a standard residential property does not usually require planning permission. However, if you live in a listed building or a designated conservation area, different rules may apply and you may need approval before any work begins. A local installer can usually advise you during the quotation stage, especially if they regularly work on properties in your area.
What is the most energy-efficient type of double glazing?
Look for windows with an energy rating of A or above, with low-emissivity glass and argon gas filling between the panes. The window’s overall performance depends on the frame material, glass specification, seals, and installation quality. For most homes, modern uPVC double glazing offers a strong balance of energy efficiency, durability, and value.
Ready to Get an Accurate Quote?
If you want a clear, honest idea of what new windows will cost for your home, we are happy to help.
We’ll take a proper look at your property, talk you through your options, and give you a straightforward quote with no obligation and no pressure.
Get in touch today to arrange a free home survey.
