Window Replacement Cost

If you want to instantly transform the look of your home, think about window replacement. New windows will lower energy loss, enhance the security of your house and reduce noise pollution, so it’s well worth it. 

window replacement cost

Are your windows old, draughty, wet with condensation or a total eyesore? If the answer is yes then you need to replace your windows. Replacing your windows will save you money by reducing heat loss and enhancing your property’s security.

If you don’t think you need completely new windows then you can always look into repairing your old ones or adding double or triple glazing. However, if you live in a listed property, you need to make sure that you apply to your local authority before changing any of the windows.

How much does it cost to replace windows?

Window replacement costs £400 on average with most homeowners spending between £350 and £1,500 per window including installation. The average window replacement cost of a 3 bedroom terrace is between £3,000 to £5,000. 

The cost of replacing windows will depend on the size and the material as wooden frames are more expensive than uPVC frames but many people prefer the look of timber frames. The final decision on replacing your windows is up to you and you will need to choose what you can afford as well as what will suit the look of your home.

UPVC Windows Replacement Cost

UPVC window replacement costs range from £210 to £900 each with most homeowners paying between £350 and £470 for a double-hung, double-pane, and energy-efficient window. UPVC are popular because they are durable and low maintenance, they also insulate your home well. UPVC window frames are also popular because they cost less than wood or metal windows and should last about 35 years if they are of good quality. 

UPVC Window Replacement Cost (labour + materials, excluding VAT and profit)
Size (mm) Cost (Basic style) Style Price Variation
600 x 900 £210 – £450  £370 – £640
900 x 1200 £310 – £550 £480 – £720
1200 x 1200 £350 – £650 £20 – £900

Softwood Windows Replacement Cost

For a softwood replacement window, expect to pay between £350 and £1,080, or £650 on average including installation. Softwood window frames are good natural insulators and can be carved, decorated and painted to suit your home’s style. Wooden window installation is quite a specialist thing nowadays, it’s not that common. Good quality timber window frames are also expensive to buy.

Softwood Window Replacement Cost (labour + materials,excluding VAT and profit)
Size (mm) Cost (Basic style) Style Price Variation
600 x 900 £350 – £490 £350 – £490
900 x 1200 £360 – £600 £360 – £600
1200 x 1200 £515 – £760 £515 – £760

Replacement Aluminium Windows Cost

Replacement aluminium windows range from £250 to £1000 each depending on the size, and the number of panes. Aluminium windows do not rot or rust and provide good security and require low maintenance. However, metal-framed windows don’t insulate as well as uPVC and can cause condensation. A thermal break (a layer of plastic inside the frame) helps to combat this problem.

Aluminium Window Replacement Cost (labour + materials,excluding VAT and profit)
Size (mm) Cost (Basic style) Style Price Variation
600 x 900 £250 – £375 £580 – £705
900 x 1200

£350 – £605

£885 – £910

1200 x 1200 £365 – £670 £615 – £1020

Bay Window Prices

The average cost of bay windows cost comes to £1,100, with most homeowners spending between, £1,000 – £2,200. Bay windows are a modern and elegant way to open up a room, creating a larger area that allows up to five times more light in than regular windows. They can be fitted with either wooden or uPVC frames and installed as single or double glazed across three, five, seven or even nine new panels.

Size of Window (mm)StylePrice per window (not including installation)
2400 x 12003 section£1,000 – £1,200
3000 x 12003 section£1,200 – £1,300
3000 x 15003 section£1,300 – £1,400
3000 x 12004 section£1,500 – £1,600
3600 x 12004 section£1,600 – £1,700
3600 x 15004 section£1,700 – £1,800
3600 x 12005 section£1,900 – £2,200

Single-Hung Replacement Windows

A typical single-hung window costs £500 to £1500 on average, and is one of the most popular choices due to price. Single-hung windows keep the top part of the windows fixed and only the button half can move up and down. 

Double-Hung Window Prices

A typical double-hung window costs on average £750 to £1850. Double-hung windows 

allow both the top and bottom parts to move and up and down. If you are willing to pay more the top and bottom halves also swing inward. 

Adding Double Glazing 

If you don’t want to replace your windows, then adding double glazing can still make a big difference to your home. Double glazing involves adding an extra pane of glass to the window; this creates a barrier or air in between the panes which helps insulate your home. According to the Energy Saving Trust, adding double glazing to your home can cut heat loss by half and save 720kg of CO2 every year.

Double glazing has the added benefits of reducing noise pollution and eliminating condensation, which can cause serious mould problems in your home. Double glazing will save you money on your energy bills, provide security for your home and make it more attractive. 

Most window frames are designed for single panes so the double glazed units will not fit, unless you remove the whole frame entirely. Double glazing costs on average around £640 per window but you can find high-quality double glazing for £350 if you do the research yourself. The installation cost comes at £250 but it is really worth hiring a professional. 

Triple Glazing Windows

A triple glazed window has three panes of glass and two gas filled spaces acting as barriers to cold. The spaces are usually filled with argon to produce a thermally efficient barrier to cold and draughts. 

The windows are available in a range of sizes and styles from wooden frames or uPVC, depending on your choice. There are a variety of colours to choose from. These windows are guaranteed for 10 years so will have peace of mind when you have them fitted.

The triple glazing costs for your home will of course depend on the size and number of windows in your home. Some window manufacturers have specials on triple glazing costs. Price for triple glazing will ultimately depend on the size of the window. Some manufacturers include fitting and installation in the price of triple glazed windows.

Triple glazed windows cost more than standard windows as they have greater energy saving benefits, even over double glazed windows. Expect to pay 35% on the top of what you were quoted for a double glazing unit. 

Window Replacement Cost Estimator

To understand the costs behind installing replacement windows, you have to take into account both the cost of manual work and the materials

A tradesperson will generally be paid £150-£180 per day and if they require the help of a labourer, that will cost on average an additional £80-£100 per day. 

If the glass replacement job requires scaffolding, that will cost extra from £46 to £174 per day. 

On top of this, you have to take into account the actual cost of the glass and if you are upgrading to double or triple glazing the cost of the new casement.

Marketing and advertising expenses and operating expenses for medium or large companies result in requesting higher prices. 

Lastly, you will need to account for the profit that the contractor/company will be making. 

How do I find someone to replace my glass windows?

Check out approved installers who will fit your replacement windows in line with government building regulations. There are several Competent Person schemes;  installers who are part of these schemes will provide you with a certificate to prove the work meets building regulations once the replacement windows are fitted. 

Registered schemes for windows can be found by looking up FENSA, Certass or the Network VEKA website. If you pick a window installer who has not been registered with such a scheme then you will need to apply for building control approval before installing any replacement windows.

Get Window Replacement Quotes

To make sure you get the best deal you should compare a number of different quotes from at least three separate contractors who specialise in window repairs and replacements; each of them will be able to offer specific details about your particular requirements – and if possible even send out a surveyor for an (often free) preliminary inspection of the windows on your property.

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