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Alexander Constructors

0 review(s)
Offers services in CORNWALL
South Wales, Penarth based design and build contractor. Projects completed include new houses, extensions, kitchens, bathr...
Over 20 Reviews
Quality Windows, Doors & Conservatories across Cornwall, Devon & Somerset. 10+ years experience. Trust a Trader Scheme. Ul...

R & G INSTALLATIONS SW

0 review(s)
Offers services in CORNWALL
R&G Installations SW Ltd are a family run, South - West based installation company specialising in conservatories and high...

Recent Window Installer Enquiries

21 Sep

Wooden Windows

Redruth - TR15

Enquiry from: Alison H

Start Date: Immediate

Double glazed wooden frame window has gone in middle pane of lounge window cost of replacing and fitting please

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12 Sep

Replacement Glass Only

Looe - PL13

Enquiry from: Sean K

Start Date: Immediate

Bedroom window glass approx 30x50 set in a stable door style window converted from a sash window, open to ideas about replacement also

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10 Aug

uPVC Double Glazing

St. Columb - TR9

Enquiry from: Ellie H

Start Date: Immediate

Call back anytime

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10 Aug

uPVC Double Glazing

St. Austell - PL26

Enquiry from: Sheila P

Start Date: Immediate

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05 Aug

Wooden Windows

Truro - TR1

Enquiry from: Elizabeth W

Start Date: Immediate

Replace wooden sash windows in grade11 listed property

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27 Jul

uPVC Double Glazing

Redruth - TR15

Enquiry from: Shannon P

Start Date: Immediate

Call back anytime

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23 Jul

Wooden Windows

Saltash - PL12

Enquiry from: Jim F

Start Date: Immediate

Four pane kitchen window replacement

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30 Jun

uPVC Double Glazing

Torpoint - PL11

Enquiry from: Kate G

Start Date: Immediate

Submit your free quote for rated tradespeople

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30 May

Replacement Glass Only

Looe - PL13

Enquiry from: James T

Start Date: Immediate

I need three double glazed panes replaced due to misting up

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24 Apr

Replacement Glass Only

Penzance - TR18

Enquiry from: Becky C

Start Date: Immediate

Last night I noticed that the glass in my attic Velux window had shattered. I’m not sure how it happened

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19 Apr

uPVC Double Glazing

Penzance - TR19

Enquiry from: Rachel B

Start Date: Immediate

2+ windows Supply and install

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18 Apr

uPVC Double Glazing

Truro - TR1

Enquiry from: John M

Start Date: Immediate

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10 Apr

Wooden Window Repair

Penzance - TR20

Enquiry from: Lizzie N

Start Date: Immediate

Wooden window repair Lead

Repairs to 3 x 1st floor wooden windows, approx. 113cm x 88cm. Probably from 1980s 0r 90s although property much older. Accessible from conservatory roof

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29 Mar

uPVC Double Glazing

Newquay - TR7

Enquiry from: Jamie B

Start Date: Immediate

Multiple windows Supply and install

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18 Mar

uPVC Double Glazing

St. Austell - PL25

Enquiry from: Deb C

Start Date: Immediate

2+ windows Supply and install

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17 Mar

Replacement Glass Only

St. Ives - TR26

Enquiry from: Graham C

Start Date: Immediate

3 panes one window with 1 window with two panes

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17 Mar

Wooden Windows

St. Ives - TR26

Enquiry from: Graham C

Start Date: Immediate

Ives areas is looking to do a couple of projects at the moment, and would like quotes for wooden windows

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17 Mar

uPVC Double Glazing

St. Ives - TR26

Enquiry from: Graham C

Start Date: Immediate

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11 Mar

Replacement Glass Only

Penzance - TR20

Enquiry from: Hazel H

Start Date: Immediate

Quote pls for replacement glass to Velux Window

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19 Feb

Window Repair

Redruth - TR15

Enquiry from: Dave R

Start Date: Immediate

A flat roof velux with rain sensor, needs to be checked as it doesn't open, possible motor burnt out

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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 Cornwall is:

£2,082

Window Installer job Window Installer cost in 2026
Double glazing in Cornwall £1,500-£5,000
Upvc double glazing units only in Cornwall £800-£1,200
Triple glazing in Cornwall £1,500-£5,000
Aluminium windows in Cornwall £1,875-£2,875
Wooden window in Cornwall £3,750-£5,750
Aluminium windows supply only in Cornwall £2,600-£3,900
Upvc or wood porch in Cornwall £2,625-£4,025
Sash window in Cornwall £1,800-£6,000
Glaziers in Cornwall £57-£87
Secondary glazing in Cornwall £1,500-£5,000
uPVC Single Window in Cornwall £225-£345
Wooden sash windows in Cornwall £3,750-£5,750
Wooden windows supply only in Cornwall £2,760-£4,140
Aluminium repair in Cornwall £240-£360
Window repair in Cornwall £268-£402
Wooden window repair in Cornwall £320-£480

Related Window Installer searches in Cornwall

Window Installer FAQs

how much does double glazed windows cost?

Are you looking to replace your old window for a new double glazed window and wondering what it’s going to be the cost? Well, the double glazed windows market is a very competitive one in the UK with varying prices across the country. Therefore, if you shop around you’re most likely to find something that’ll fit your budget both products and quality wise.

As you would have expected, the more windows you required the more money you are going to spend. However, the cost per window is likely going to be lower depending on the number of windows you purchase. Several double glazed windows come with a 10 year warranty but it’s advisable to also obtain a solid workmanship warranty which provides coverage for any potential problems for a good period of time upon installation.

To determine the cost of double glazed windows, there are so many things to put into consideration that just the primary dimensions of the window itself. Other factors that works to decrease or increase the cost of the project includes the frames’ quality as well as the material used. For example hardwood can be quite high priced when compared to uPVC.

The number of opening windows within the frame can also play a huge role in the cost of the windows as well as the type of the glass. The cost of a double glazing window usually ranges between £100 to £3,200 per window, depending on the available options.

To have a more accurate estimate of the cost of a double glazing window, you’ll need a obtain a survey from a double glazing installer who can take into account any possible complications that may arise when installing your windows while also giving an advise on the most suitable window style for your property.

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 to fit aluminium double glazed window?

Whether you’re hiring a professional to replace your double glazing or are considering DIY, it’s a good idea to know how to fit a double glazed window.

You need to start by assembling your window. Fit any handles and cut the outer sill to size by measuring the outer wall depth. Then, screw the outer sill to the window frame and attach the frame fixers. Screw the ventilation grilles onto the inside of the frame and fix the vents on.

Next, you need put the window into place, using spacers to wedge it in. Use a spirit level to check it’s level horizontally and vertically, adding extra spacers if needed. Then, fix the frame into place at each fixing point using a drill, wall plugs and screws. Measure and cut the interior sill, and check that it’s level, adding spacers if needed. Then fix it using screws, masonry nails or adhesive.

Finally, fill in any wide gaps with foam filler and small gaps with sealant. You can get interior and exterior trims to cover these up, making your window look neat and professional.

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.

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.

Will a new double glazed window look different to existing ones?

It depends on a few factors whether a new double glazed window will look different to existing ones. If your existing windows are very old, perhaps 10 years or more, then it’s likely that there will be some small differences.

The first thing to remember is that your double glazing is exposed to the elements as soon as it’s installed. So over time, unless you’re very good at cleaning and maintaining your windows, they’re likely to look a bit dirty. Window frames that are south-facing may also become slightly discoloured from the sun, so if you install a new window right next to it you might notice a difference.

Also, there have been lots of technical advances in windows over the years. If your existing windows are significantly older, you might notice a difference in the handles on openers, and if your existing windows were installed before 2010 they might not have trickle vents, which is an extra strip on the inside of your window to keep air flowing through your home. While it’s not a legal requirement for replacement windows to have trickle vents if the original one didn’t, it’s a good idea to have them installed as they help prevent condensation and mould.

The only truly noticeably different elements to a new double glazed window compared with existing ones are likely to be on the inside, which might not be a problem for you if you only have one window in a room. However, if you know the brand of your existing windows, you can ask your window installer if they can source the same ones. Even if they’ve been updated slightly, the difference should be minimal.

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.

What is double glazing?

If a window is double glazed, it has two panes of glass that have a space between them containing argon gas. The gas works as an insulator, keeping heat inside the house as well as reducing noise. It also strengthens the window.

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