uPVC Double Glazing
Thornton Heath - CR7
Enquiry from: Karen L
Start Date: Immediate
2+ windows Supply and install
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Thornton Heath - CR7
Enquiry from: Karen L
Start Date: Immediate
2+ windows Supply and install
Morden - SM4
Enquiry from: Lorriane C
Start Date: Immediate
2+ windows Supply and install
Morden - SM4
Enquiry from: Lorriane C
Start Date: Immediate
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Mitcham - CR4
Enquiry from: Amritpal S
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London - SW19
Enquiry from: Fiona B
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3 small replacement windows 1 back door
London - SW19
Enquiry from: Gregory T
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2+ windows Supply and install
Mitcham - CR4
Enquiry from: Huma T
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2+ windows Supply and install
London - SW18
Enquiry from: Allan B
Start Date: Immediate
Existing bedroom bay window double glazing replacement (7 windows). Front Gable Bargeboard replacement with uPVC (Black) (1930s Mock (address removed) )
London - SW17
Enquiry from: Gina W
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Mitcham - CR4
Enquiry from: Vije W
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Windows coudnt shut replacement repairs needed urgent. thanks
London - SW17
Enquiry from: Fleur L
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Looking at various options 2+ windows Supply and install
London - SW20
Enquiry from: Nihat D
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London - SW17
Enquiry from: Alexandra H
Start Date: Immediate
2+ windows Supply and install
London - SW17
Enquiry from: Kate R
Start Date: Immediate
Multiple windows Supply and install
How much do Window Installers cost? Prices for Window Installers in 2026 can differ relying on the kind of task that you require to have performed in your house. It's the inquiry we get asked a whole lot "how much do Window Installers charge?". It's generally very good to have an idea of how much a Window Installer are going to likely charge for their services. Prices will probably rise and fall based upon the products and also the tradesman selected. The table reveals the sorts of service that Window Installers typically do and also the typical cost range of these jobs. Some tasks take longer to complete than others so prices do fluctuate by task.
View our Window Installer cost guide View our Window Installer advice| Window Installer job | Window Installer cost in 2026 |
|---|---|
| Double glazing in Merton | £859-£2,734 |
| Upvc double glazing units only in Merton | £575-£900 |
| Triple glazing in Merton | £859-£2,734 |
| Aluminium windows in Merton | £1,182-£2,559 |
| Wooden window in Merton | £3,750-£5,750 |
| Aluminium windows supply only in Merton | £1,600-£2,500 |
| Upvc or wood porch in Merton | £2,625-£4,025 |
| Sash window in Merton | £959-£3,067 |
| Glaziers in Merton | £57-£87 |
| Secondary glazing in Merton | £859-£2,734 |
| uPVC Single Window in Merton | £225-£345 |
| Wooden sash windows in Merton | £3,750-£5,750 |
| Wooden windows supply only in Merton | £2,760-£4,140 |
| Aluminium repair in Merton | £240-£360 |
| Window repair in Merton | £268-£402 |
| Wooden window repair in Merton | £320-£480 |
These days, buyers expect homes to have double glazing. People recognise the benefits of installing double glazing, so if you don’t have it installed you should consider it. You’ll increase your property’s value and give it a better chance of selling faster, since single glazed properties are also more likely to have problems with damp and mould which could put buyers off.
To install one small double glazed window, it will take anywhere between two hours and half a day. It will depend on whether one installer is fitting your window or two. And if you’re doing it yourself and don’t have any professional experience, it will take even longer.
When the window fitters arrive, they will make sure they’ve got safe access to the window and move any heavy furniture if they need to. Any good installer will lay down a dust sheet, but it’s a good idea to check that they’ve got one laid down before they start.
The first step any window installer will take is to double check the measurements of the new frame against your existing one. Hopefully it should match up, so then they’ll take the old window out. Then, they’ll insert the new frame into the aperture and bolt it into the concrete. They'll check it with a spirit level to ensure it’s even before moving onto the glass sealed unit.
The installer will place the glass into the aperture, then fit the beads to secure the glass in the frame. They’ll then use silicone and trim on the inside and outside to ensure the window looks perfect. You won’t be able to see where they’ve used sealants or trims because they’ll colour match them so it’s not noticeable. Then, they’ll tidy up all of their tools and the working area and let you know what needs to be done in terms of proving that the window meets building regulations. Most good installers are registered with a self-certification scheme, so will be able to issue a certification once the work is complete.
Aluminium windows have a range of benefits that make them a great alternative to uPVC windows. Developments in technology have meant that modern aluminium windows now have the same energy efficiency levels as uPVC. Plus, their strength and flexibility make them a more attractive choice to many homeowners, particularly for more modern buildings.
Aluminium frames are typically much thinner than uPVC frames, allowing more light in and wider views. The metal can also be moulded to suit custom shapes, making it ideal for unusually shaped windows. Aluminium windows are available in lots of different colours, so can be designed to suit a wide range of interiors and exteriors.
Some properties are unable to have double glazing, especially those in conservation areas or listed buildings. To counter this problem and still benefit from a warmer home and cheaper bills, secondary glazing is an option. Secondary glazing is a second pane fitted inside your original window. Secondary glazing will still save you around £105 yearly.
Ultimately the double glazing company you use is responsible for the quality of work and to ensure your windows are of an excellent standard. This is why it’s important to get a warranty and use a Fensa registered installer. If problems emerge within a couple of years then it’s likely the installation was of a poor standard.Contact the double glazing company and have the issue repaired or new windows replaced. This doesn’t matter if you received a discount of free windows as part of the deal. As long as you entered into a contract the company is obliged to restore the windows.
You don’t have to, especially if you’re on a budget. If you’re only replacing some, it’s a good idea to get all the windows on one side of your property replaced at the same time, so they all look the same. Be aware, obviously, huge savings could be had by having a number of windows replaced at the same time.
The energy efficiency of windows is measured using ratings, varying from A, the most efficient, to G, the least efficient. This scheme is run by the British Fenestration Council (BFRC). To comply with Building Regulations you’ll need windows of energy efficiency at least level C.
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