Secondary Glazing in London

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Average Secondary glazing cost in London

The typical cost of double glazing is approximately £400-600 per window, so you’re looking at approximately £2,000 to install 4 double glazed windows in a flat, and up to and exceeding £5,000 for replacing all the windows in a standard-sized home.

Average price per Secondary glazing job in 2026

Avg. price low

Avg. price low
£859

Avg. price

Avg. price
£1,380

Avg. price high

Avg. price high
£2,734

£2900

£2175

£1450

£725

£0

Prices based on actual Secondary glazing costs for London, as reported by local LeadsDoWork members.

Secondary glazing installation cost in London 2026

Labour cost £1,400
Material cost £500
Waste removal £100
Time frame: 1-2 days
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Secondary glazing on Google in London

Google searches that showed Local Quotes, 20 July to 17 October 2026

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Searches that showed one of our pages for London, all services

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The Greater London region has the second biggest population in the UK, just behind the South East. However, with the smallest land area of all 9 English zones, it comes with a large population density of 5,701 people per square kilometre; this is more than ten times of any other English region. London continues to increase in size over time, becoming increasingly industrialised. The City of London at the same time ranks as one of the most expensive urban centres on the planet, beside Tokyo and Moscow. For your household developments be sure to work with trustworthy firms and guarantee an excellent finish you will be proud of.

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Secondary glazing pros in London

Crystal Windows and Doors Ltd

1466 review(s)
Based: in Romford, RM7 7PN

Crystal is a uPVC Windows and Double Glazing manufacturer and installer. We have built a strong reputation in London and the South East for great value and exceptional service in the design, production and installation of quality uPVC Windows, Doors,...

Latest review

Abdullah A., E5
4

uPVC Double Glazing in London

online reviews scared me

BAU UK Ltd

57 review(s)
Based: in Petersfield, GU31 4AD

BAU UK are a complete home improvements specialists located in the South Coast, with focuses ranging from windows and doors to insulation and solar. Fully accredited, insured and trained in the latest technologies, our team can offer leading services...

Latest review

Annette R., PO16
5

uPVC Double Glazing in Fareham

Excellent Service

Valley Glazing Ltd.

2 review(s)
Based: in Gravesend, DA12 5RR

Valley Glazing is a friendly family run business, with over 34 years of experience in the trade. We are FENSA registered and supply a 10 year insurance backed guarantee with deposit protection. We supply and install high quality Windows and Doors i...

Latest review

Margaret D., TN2
4

uPVC Double Glazing in Tunbridge Wells

Thoughtful insight into what was good from my point of view.

Advanced Glazing Systems Ltd

8 review(s)
Based: in Upminster, RM14 1TH

AGS are the experts in all areas of UPVC home improvements and we want to help you create your dream home. We are much more than the average double glazing company and we are confident that you will notice a real difference between AGS and our com...

Latest review

Bob S., EN1
3

uPVC Double Glazing in Enfield

I am still waiting for a quote

Maceland Window and Door Systems LTD

5 review(s)
Based: in Surrey, KT8 2HT

CLICK IMAGE TO ENTER SITE

Latest review

Graham T., KT18
5

uPVC Double Glazing in Epsom

I cannot remember who did quote

Falcon Windows

3 review(s)
Based: in Sutton, SM1 2EJ

Suppliers and installers of quality upvc windows and doors, aluminium windows and doors, bi folds, rooflights, lanterns and more right across Cheam, Sutton, London and Surrey. Call today for a quote

Latest review

Ishver M., KT2
4

uPVC Double Glazing in Kingston upon Thames

good but not competative

Primary Windows & Doors LTD

4 review(s)
Based: in Watford, WD17 1DU

We at Primary Windows & Doors with our 25 years experience in the industry feel our unique operation where we design, survey & install all ranges of products such as windows, doors roofline and conservatories is second to none. Our installations a...

Latest review

Jayne C., W13
5

uPVC Double Glazing in London

Excellent from initial call to installation Price was very competative & more importantly the service & craftsmanship...

Royale Glazing Installations LTD

5 review(s)
Based: in Feltham, TW13 7LW

Royale Glazing Installations Ltd is a Double Glazing company in West London which has over 30 years of experience within the Double Glazing Industry, with our own self contained Factory in Feltham Middlesex were we specialises in the manufacture ...

Latest review

Martin H., TW1
5

uPVC Double Glazing in Twickenham

excellent

Britains Best Casement Glazing Ltd

5 review(s)
Based: in Brentford, TW8 9HF

Latest review

O E., W6
4

uPVC Double Glazing in London

Had to phone several times to try to catch me in. Salesperson came this morning (10th March). Sensible, factual, clea...

Creative Windows & Doors LTD

19 review(s)
Based: in Banstead, SM7 2NL

Creative Windows & Doors | windows and doors surrey - Creative windows and doors supplier

Latest review

Ishver M., KT2
5

uPVC Double Glazing in Kingston upon Thames

very competative

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London - SE4

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London - E17

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London - N17

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London - N18

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London - SE6

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26 Aug

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London - E6

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London - NW11

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London - E7

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London - E16

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London - SW19

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30 Jul

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London - SW19

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18 Jul

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London - N11

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London - SE9

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FAQs

how much are new windows?

Are you about to replace your old windows and wondering just how much it’ll cost to have a new one fitted? If yes, then you’ve come to the right place! The question is a very straight forward one, however a direct answer can not be provided as determining window prices for a replacement project can be a very tricky challenge. With a plethora of influencing factors that can play a key role in the price of both materials and labour to be used, it could be extremely hard for a window installer to provide a cost estimate without paying you a visit beforehand.

The factors that can go a long way in determining the price of your new window includes the size of the window, frame material, style chosen, your location, rates charged by the window installer (these rates can be different from an installer to an installer, so it’ll probably be in your best interest to compare quotes to identify the most competitive price) as well as the type of glass required.

Generally, for a small flat featuring four windows, the average cost for new windows would be between the range of £2,100 to £2,300. This range provided covers the cost of double glazed uPVC casement windows as well as the installation price. In the same tone, a home with up to 8 windows will have an average cost for window replacement between the range of £4,400 to £4,600, wile also taking into account the installation price. Whereas a house comprising 10 windows could begin at an average cost of window replacement between the the range of £5,200 to £5,500, and a 15 window home will be between the range of £8,400 to £8,600. it should be noted that the aforementioned figures only include the standard number of windows with a uPVC frame and the installation cost.

what is a window sash?

Windows, being a very crucial feature in every home, are one of the things you simply can’t afford to ignore in your home. Having a good understanding and solid knowledge of your windows’ components like the window sash will help you stay up to date with them and able to identify any minor mishaps early on before it leads to a much bigger problem. So what exactly is a window sash?

Well without much fuss, a window sash is simply that part of your windows that’s able to open and close. And there could as well be more than one window sash that’s operable depending on your window’s type. Window sash usually possess a very basic design as well as structure. What’s more? This section of a window happens to be a frame that’s designed in such a way to make for easy placement inside the whole window casement. You’ll discover inside the sash frame, the window glass alongside any framework possessed by your window which includes grids.

Usually, the sash is fitted into the frame of the window on a runners’ set in such a way that allows for both upward and downward movements. And finally, the window sash’s frame typically comes with a locking system which provided for extra safety and security.

The window sash is a vital feature that can determine the durability and overall performance of the windows. In the event whereby your window sash is malfunctioning, it can result to numerous problems which includes both drafts as well as leaks. As a result, it’s very important to keep your window sashes in a great working condition as failure to do so will make opening and closing your windows a really difficult task.

how to fit a double glazed window?

Did you just purchase a double glazed window and confused about how to have it installed? Fitting the window yourself can be quite easy with the help of this step by step guide. However, if you lack proper training or experience, we’d recommend you reach out to a trustworthy professional who can guarantee the best results for help. That said, now let’s take a look at the process.

• Remove the old windows by detaching the old beading and glass window safely. Then make some interval cuts using a hand saw before using a crowbar to pry it out.

• Cut the external double glazed window seal. Once done, take a measurement of the window area’s width once empty. Then transfer the measurement to the window sil to face outside and cut using a handsaw.

• Seal the window sil. Add a bead of clear silicone along both inside lip as well as the centre to seal the sil.

• Screw the double glazed window to the sil. Position the window on the top of the lipped section that was siliconed. Then pre-drill them together and screw in three places. You should make sure the screws do not go totally to the sil’s bottom.

• Install the double glazed window. After successfully screwing the double glazed window to the sil, you can now fit in the double glazing. Make use of packers to make sure it’s even in the slot.

• Screw the uPVC window to the wall. If you’re happy and satisfied with the position of the window, you can then pre-drill through the frame of the window and the brick wall. Once done, simply screw it in place using masonry screws or Spax screw as they do not require crawl plugs in bricks.

• Seal around the window. To do this, simply fill any gaps with expanding foam, wipe out the excess and seal with silicone.

Do I need to stay at home while my windows are being replaced?

Most installers will not need you to be at home while they are fitting your windows. It is a good idea to be present though, just in case they have any questions for you and perhaps for your own peace of mind. If you cannot be there, you will need to arrange access to the property and/or agree securing the property at the end of the day.

Secondary glazing

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London Secondary glazing pros are rated 4.4 out of 5 on average: 26 rated pros, 142 reviews, of 152 pros covering the area.
The LeadsDoWork rating and review is an overall rating based on verified reviews and feedback from the customers with Secondary glazing projects that have been connected with Secondary glazing pros to help them. All Secondary glazing contractors All London Secondary glazing contractors

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