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Verified ProOver 50 Reviews

Britelite Windows

156 review(s)
Offers services in MERTON
We fit high quality double glazing and the next generation triple glazing, using only the best materials. Fully guaranteed...
Verified ProOver 50 Reviews
Mitchell Landscaping have been established for 10 years, offering quality advice and services in landscaping, Gardening a...
Verified ProOver 50 Reviews
Crystal is a uPVC Windows and Double Glazing manufacturer and installer. We have built a strong reputation in London and t...
Verified Pro
Welcome to Haas Extension Group, where we take pride in being the premier suppliers, installers, and design consultants of...
Verified Pro

House of Glass

2 review(s)
Offers services in MERTON
House of Glass ltd are a genuine, family run, home improvement company specialising in replacement windows & doors , conse...
Verified Pro

Lewes MB

0 review(s)
Offers services in MERTON
All aspects of windows, door and conservatory industry undertaken. Repairs or installations.

Recent Window Installer Enquiries

02 Jul

Windows | uPVC

London - SW16

Enquiry from: Katherine S

Start Date: Immediate

Customer is looking to have new windows installed. They are unsure of options so would like to discuss. Confirmed interest via Customer lives in London area 2+ windows Supply and install Please call ...

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27 Jun

Windows | uPVC

London - SW19

Enquiry from: Derek S

Start Date: Immediate

Customer made an online enquiry for quotes for double glazing replacement via one of our websites. Customer lives in London area and is considering a range of options for their home. 2+ windows Supply...

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27 Jun

Windows | uPVC

London - SW18

Enquiry from: Amanda H

Start Date: Immediate

customer in london area made an enquiry for double glazing online. confirmed via sms at 04:14 confirmed via phone at 04:15 2+ windows supply and install please call to arrange an appointment to discus...

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25 Jun

Windows | uPVC

London - SW19

Enquiry from: Angela T

Start Date: Immediate

Customer is looking to have new windows installed. They are unsure of options so would like to discuss. Confirmed interest via Customer lives in London area 2+ windows Supply and install Please call ...

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24 Jun

Windows | uPVC

London - SW17

Enquiry from: Roohi B

Start Date: Immediate

Customer in London area made an enquiry for double glazing online. 2+ windows Supply and install Please call to arrange an appointment to discuss options

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23 Jun

Windows | uPVC

London - SW18

Enquiry from: Amanda H

Start Date: Immediate

customer in london area made an enquiry for double glazing online. confirmed via sms at 04:14 confirmed via phone at 04:15 2+ windows supply and install please call to arrange an appointment to discus...

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21 Jun

Windows | uPVC

London - SW17

Enquiry from: Karimullah T

Start Date: Immediate

Customer made an online enquiry for replacement windows via one of our websites. Confirmed via /phone. 2+ windows Supply and install Please call to arrange an appointment to quote.

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17 Jun

Windows | uPVC

London - SW17

Enquiry from: O

Start Date: Immediate

Customer in London area made an enquiry for double glazing online. 2+ windows Supply and install Please call to arrange an appointment to discuss options

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14 Jun

Windows | uPVC

London - SW19

Enquiry from: Joanna S

Start Date: Immediate

Customer is looking to replace their windows. They are still considering options so please call to discuss what would be best for their home. Homeowner lives in London area 2+ windows Supply and insta...

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14 Jun

Windows | Wooden

London - SW18

Enquiry from: Marissa M

Start Date: Immediate

customer in the london area made an enquiry a couple of projects including wooden windows.call anytime and arrange an appointment to discuss. below is some details about this project: are you the prop...

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14 Jun

Windows | uPVC

London - SW18

Enquiry from: Marissa M

Start Date: Immediate

customer in london areas is looking to do a couple of projects at the moment, and would like quotes for upvc double glazing.confirmed interest via sms and email at 14/06/2025 00:24.please call to arra...

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10 Jun

Windows | uPVC

London - SW18

Enquiry from: J

Start Date: Immediate

Customer made an online enquiry for new double glazing. Homeowner confirmed interest via Considering a range of options Homeowner lives in London area 2+ windows Supply and install Please call to arr...

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07 Jun

Windows | uPVC

London - SW18

Enquiry from: Ishah R

Start Date: Immediate

Customer is looking to get quotes for replacement double glazing. multiple windows Supply and install Please call to quote.

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04 Jun

Windows | uPVC

London - SW16

Enquiry from: Sylwia K

Start Date: Immediate

Customer is looking to have new windows installed. They are unsure of options so would like to discuss. Confirmed interest via email/SMS/ Customer lives in London area 2+ windows Supply and instal...

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03 Jun

Windows | uPVC

London - SW17

Enquiry from: G

Start Date: Immediate

Customer made an enquiry for replacement double glazing via one of our websites. Looking at various options Confirmed interest 2+ windows Supply and install Please call to discuss options and arrange ...

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02 Jun

Windows | uPVC

London - SW18

Enquiry from: Rosario D

Start Date: Immediate

Customer made an enquiry for replacement double glazing via one of our websites. Looking at various options Confirmed interest 2+ windows Supply and install Please call to discuss options and arrange ...

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01 Jun

Windows | uPVC

London - SW17

Enquiry from: Kolyo I

Start Date: Immediate

Customer is looking to have new windows installed. They are unsure of options so would like to discuss. Confirmed interest via /phone Customer lives in London area 2+ windows Supply and install Please...

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01 Jun

Windows | uPVC

London - SW19

Enquiry from: C

Start Date: Immediate

Customer living in London area made an enquiry for double glazing quotes via one of our websites. Customer confirmed interest via Homeowner needs advice on options 2+ windows Supply and install Pleas...

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26 May

Windows | uPVC

London - SW18

Enquiry from: Vivienne S

Start Date: Immediate

Customer made an online enquiry for replacement windows via one of our websites. Confirmed via email/SMS/. 2+ windows Supply and install Please call to arrange an appointment to quote.

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25 May

Windows | uPVC

London - SW19

Enquiry from: H

Start Date: Immediate

Customer in London area made an enquiry for double glazing online. 2+ windows Supply and install Please call to arrange an appointment to discuss options

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How much do Window Installer services cost?

How much do Window Installers cost? Prices for Window Installers in 2025 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

The average price
of a Window Installer in Merton is:

£1,790

Window Installer job Window Installer cost in 2025
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

Related Window Installer searches in Merton

Window Installer FAQs

How can I find out how energy efficient my new windows will be?

All new windows come with an energy efficiency rating from A to G. A is best, while G is the lowest rating. Anything above C is considered good, but these days most companies will be able to supply you with A-rated windows to maximise your energy efficiency.

Should I use a Fensa registered installer?

Using a Fensa registered installer isn’t compulsory but it helps to protect you from cowboys and rogue traders. It will also make life a whole lot easier in regards to Building Regulations. Replacement windows must meet a certain energy efficiency rating and once fitted you need a certificate to show your installation complies. By using a Fensa registered company they’ll issue this certificate, otherwise you’ll need the council to look at the new windows.

how does double glazing work?

One of the essential factors that makes a home truly a home is the convenience and comfort it provides us. As a result, we usually have a long to do list comprising things that come together to make sure our home is comfortable with ambient temperature at the very top of the scale of preference. After all, no matter how greatly designed your furniture and home decor is, it probably would amount for nothing if the temperature is either too hot or too cold. Some of the most common ways we incorporate to make the temperature a lot more conducive and warm during the winter months is by installing air conditioning system or through top notch insulation materials, but the fact still remains that a lot of heat would escape through the doors and windows. And that’s exactly the use of double glazing. So how exactly does double glazing work?

Double glazing basically works by preventing the escape of air and trapping it between two panes of glass. It’s the trapped air which serves as an insulation barrier which delivers 3 major functions. First and foremost, it stops the escape of heat through the window as the barrier created insulates the room from varying air temperatures at both sides of the glazing unit. The second major function is the double glazing works to keep down noise pollution coming from outside. While the third major function of double glazing I the fact that it helps minimize condensation which usually occurs on the single glazed windows’ inside as the cold outside air works to cool the warm air inside the house. When you install a double glazing window, the insulation barrier generated will work to stop the air temperature transmission which ultimately helps prevent the occurrence of condensation.

What happens if I have problems with my new windows?

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.

How long do double glazed sealed units last?
When it comes to how long double glazed sealed units (the glass inside the window) last, a lot of it is down to the quality of the glass and the environment that your windows sit in. It’s not uncommon for your window frames themselves (especially if they are uPVC) to last longer than your sealed units. Sealed units are called that because they’re two panes of glass sealed together with an air gap in between. They use what’s called a ‘perimeter seal’ to protect the air gap between the panes, and is usually made of butyl mastic which retains a desiccant within a perforated metallic spacer bar. The desiccant’s job is to absorb any moisture which finds its way into the air gap to stop your window from misting up on the inside. When a sealed unit fails, or is ‘blown’, it’s usually because moisture builds up around the seal and causes it to fail. Sealed units won’t last forever, so you will eventually end up with condensation inside the panes of your double glazing, but in an ideal environment your double glazed sealed units could last up to 30 years, with some manufacturers claiming as long as 40 years. But they do require a bit of maintenance and the position of your windows will also make a difference as to how long they last. There are a few things that determine how long a sealed unit will last:
  • Climate - If your window faces south, it will be subject to direct sunlight for a lot of the day. This tends to cause the sealed unit to fail more quickly – a south-facing window may last between 10-25 years. This is because the spacer bars will twist as the temperature rises and causes the adhesive holding them together to eventually fail.
  • Moisture - Windows in kitchens and bathrooms tend to fail more quickly because they come into contact with moisture more often. For example, if water gets on your windowsill when you shower, the seal around the glass will come loose more quickly if it’s constantly wet.
When you replace the sealed units in your windows or get completely new double glazing, make sure you choose an installer that uses quality products and will take all the steps to ensure that your sealed units are kept away from moisture as much as possible.
How much does one double glazed window cost?
How much one double glazed window costs is based on a few factors. If you just want to buy the window to install yourself, it will cost less than if you want an installer to fit it for you. If you want to simply buy one double glazed window without installation it could cost anywhere between £100-£300. That’s for a simple casement window, but other types like sash or tilt and turn windows could cost more. It’s recommended that you get a reputable installer to fit your double glazed windows because they’ve had the relevant training and will be able to install it much more quickly. How much it will cost for them to install one double glazed window will very based on your location, the type of window, how difficult the window is to access and whether you choose standard white uPVC or a coloured or woodgrain effect. An average uPVC casement window might cost somewhere between £300-£400, while a dual turn window might cost between £550-£660 to install. Do you really need to replace the entire window? If it’s just the double glazing that needs replacing, for example if it’s misted up inside, this will cost much less. Most window installers or a glazier will be able to just replace the sealed unit inside, and that may cost as little as £250. It’s always best to get a range of quotes from reputable companies so you know you’ve got a great price and you’re sure you’ll get excellent service.

Why are double glazed windows better than single glazed?

Double glazed windows are better than single glazed generally because they are more energy efficient. The clue’s in the name – double glazed windows have two panes of glass while single glazed windows only have one. In double glazed windows, there is a space between the two glass panes. This space is filled with inert gas or a tight vacuum, which helps to provide an extra level of insulation. That means that heat won’t escape your home easily, nor will it creep in, so you can keep your home at a more comfortable temperature.

The extra pane of glass also helps to increase your home’s security. Single glazing is pretty easy to smash through, whereas it will take much more effort to smash double glazing and will create more noise, so burglars might be put off.

Another reason why double glazed windows are better than single glazed ones is that they help to reduce noise. Of course, if you live by a busy road you’ll still hear some traffic noise, but it can be significantly reduced buy double glazing. In the same way that the inert gas in the middle of the two panes keeps heat in and the cold out, it also helps keep noise out.

With double glazing, you’ll also notice much less condensation. With single glazing, it’s common to see condensation on the inside of the windows, especially when the heating is on. This is because the outside of the window is cold, but the inside is warm. With double glazing, the insulation between the two panes stops there being such a difference in temperature between the inside and outside of the window.

How much is a single window?
Sometimes accidents happen, and that leads to you needing to replace just a single window. Luckily, most window fitters are happy to replace just one window if you need to. But how much a single window costs will depend on a few factors. Firstly, do you need the entire window, including the frame, replaced, or just the sealed unit? If the frame is still in good condition, glaziers and some window installers can replace the sealed unit and this will set you back around £250. If your window frame is damaged, don’t try to get away with not replacing it. Having a broken window frame can let heat escape your home, increasing your energy bills, and you’re likely to hear more traffic noise. Plus, if the frame is broken you might have trouble closing the window properly, stopping you from keeping your home secure. So how much is a single window if you need the whole thing replaced? You should expect it to cost between £400-£550, but it could cost more or less than this depending on your location, the size of the window and how tricky it is to replace. There are other factors that will impact the cost of replacing a single window. Do you want the window to have plain, leaded or Georgian bar glass? Maybe it will be a casement window, or a bay, bow or sash? The cost will increase if you want more than one opener if it’s a large window, and if you want it to have locks. Also, the standard white uPVC frame colour will probably be included in the price, but if you want a woodgrain look or a different colour uPVC this will cost more.

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