Find a Window Installer you can trust in Merton.

Choose from 147 Window Installers, all rated by people like you.

Over 377 reviews & an average rating of 4.2/5 stars, you'll find the right pro

Choose and shortlist

Use the shortlist button to select up to 4 tradespeople, enter your project details and press send

or

Keen to get on with the job?

Get up to 4 quotes from local Window Installers near you

Advertisement
View Shortlist
Verified ProOver 50 Reviews
We fit high quality double glazing and the next generation triple glazing, using only the best materials. Fully guaranteed...
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

Sam Shopfitter

0 review(s)
Offers services in MERTON
Sam Windows & Doors provides window and door installation and repairs across East London and surrounding areas. We work wi...
Verified Pro
Greenland Home Improvement has more than 40 years of experience supplying and fitting quality windows and doors for homeow...
Verified Pro
Your Local Experts in Bespoke Home Improvements Looking to refresh your home with high-quality, custom-fitted windows, ...

Recent Window Installer Enquiries

30 Oct

uPVC Double Glazing

Thornton Heath - CR7

Enquiry from: Karen L

Start Date: Immediate

2+ windows Supply and install

Post a similar request >

29 Sep

uPVC Double Glazing

Morden - SM4

Enquiry from: Lorriane C

Start Date: Immediate

2+ windows Supply and install

Post a similar request >

14 Sep

uPVC Double Glazing

Morden - SM4

Enquiry from: Lorriane C

Start Date: Immediate

Submit your free quote for rated tradespeople

Post a similar request >

24 Aug

uPVC Single Window

Mitcham - CR4

Enquiry from: Amritpal S

Start Date: Immediate

Submit your free quote for rated tradespeople

Post a similar request >

30 Jul

uPVC Double Glazing

London - SW19

Enquiry from: Fiona B

Start Date: Immediate

3 small replacement windows 1 back door

Post a similar request >

30 Jul

uPVC Double Glazing

London - SW19

Enquiry from: Gregory T

Start Date: Immediate

2+ windows Supply and install

Post a similar request >

22 Jun

uPVC Double Glazing

Mitcham - CR4

Enquiry from: Huma T

Start Date: Immediate

2+ windows Supply and install

Post a similar request >

17 Jun

uPVC Double Glazing

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) )

Post a similar request >

01 Jun

uPVC Double Glazing

London - SW17

Enquiry from: Gina W

Start Date: Immediate

Submit your free quote for rated tradespeople

Post a similar request >

12 May

Window Repair

Mitcham - CR4

Enquiry from: Vije W

Start Date: Immediate

Windows coudnt shut replacement repairs needed urgent. thanks

Post a similar request >

25 Mar

uPVC Double Glazing

London - SW17

Enquiry from: Fleur L

Start Date: Immediate

Looking at various options 2+ windows Supply and install

Post a similar request >

15 Feb

uPVC Double Glazing

London - SW20

Enquiry from: Nihat D

Start Date: Immediate

Submit your free quote for rated tradespeople

Post a similar request >

07 Feb

uPVC Double Glazing

London - SW17

Enquiry from: Alexandra H

Start Date: Immediate

2+ windows Supply and install

Post a similar request >

04 Dec

uPVC Double Glazing

London - SW17

Enquiry from: Kate R

Start Date: Immediate

Multiple windows Supply and install

Post a similar request >

How much do Window Installer services cost?

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

The average price
of a Window Installer in Merton is:

£1,790

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

Related Window Installer searches in Merton

Window Installer FAQs

Will double glazing increase my property’s value?

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.

How long does it take to install one small double glazed window?

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.

Why aluminium windows?

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.

What if my home isn’t suitable for double glazing?

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.

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.

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.

Should I get all my windows replaced at once?

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.

What is the Window Energy Rating (WER)?

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.

Window Installer help and advice

How it works

Tell us about your Window Installer project

Answer a few quick questions to help us match you with the right Window Installer

Get up to 4 free quotes

Receive no-obligation quotes from 4 Window Installers working in Merton.

Pick the right pro for you

Compare prices, customer reviews and services, and hire the right Window Installer.

Are you a Window Installer in Merton?

View our open Window Installer jobs near you

Join today
View Shortlist