Replacement Windows UK

If you are looking for replacement windows then Double Glazing On The Web can help. Our free windows cost calculator will provide you with an online guide price, helping you to compare window prices.

We also have a wide network of recommended window companies in the UK. This allows us to put you in touch with a local and accredited installer near you. Compare free, no obligation quotes and secure the best deal for you.

Replacement Windows Cost Calculator

Our replacement windows cost calculator is easy to use and provides you with a guide price within minutes. You can create multiple online quotes for multiple window styles. Simply follow the step by step guide to start your quote.

Replacement Windows

There are many reasons why you might decide to replace your windows. For many homeowners, it’s about eliminating cold spots and improving security. For others, it’s about adding kerb appeal and enhancing their property aesthetics.

replacement windows

Replacement windows are sure to add value, whichever the reason. Update your old windows with new double-glazed windows, and you’re immediately notice the benefits. You could soon well be enjoying a warmer home, smaller energy bills and reduced condensation.

Don’t settle for cold draughts whilst you are lying in bed or watching TV. Investing in energy efficient replacement windows will help prevent cold spots, increasing energy efficiency for a more comfortable home.

Replacement Window Styles

There are many window designs currently on the market, including designs for both contemporary and traditional style homes.

The type of windows you choose will affect the appearance of your home, so it is important that you choose a design that complements your home’s existing aesthetics.

Your replacement windows could either decrease or increase your property value so choose carefully.

Aluminium Windows

Thanks to their modern, slimline look, aluminium windows are ideal for contemporary homes and those wanting a minimalist design.

Strong, sleek and incredibly strong, aluminium is a popular material for modern replacement windows. Their slim frames maximise glazing for enhanced natural light, brightening up homes and adding a contemporary feel.

aluminium windows

These windows are extremely low maintenance as well as being incredibly energy efficient. Built with a ‘thermal break’ to help prevent condensation and improve insulation.

UPVC Windows

UPVC Windows are extremely popular and have become even more sophisticated in recent years. Available in a wide range of colours and finishes, even wood-effects, UPVC windows can be matched to almost any property.

Usually the most cost-effective choice, a UPVC window is good value and very low maintenance.

replacement windows

How Much Do UPVC Windows Cost?

Prices can start around £250 per window depending on the size, style and design.

When taking window quotes, we advise you compare prices in order to get the best deal for you. There are many factors that can contribute to the overall cost so comparing prices is your best chance at securing a good deal.

UPVC window prices will vary company to company, just make sure you check the quality of their services as well as their prices.

Are UPVC Windows Double Glazed?

UPVC windows are double glazed, fitted with two panes of glass. There is usually a space of 12mm to 16mm between these two panes and the glass is airtight, sealed and fitted into the UPVC frame.

Double glazing was designed to enhance insulation by preventing heat transfer. UPVC double glazed windows offer great thermal insulation and are often the window of choice when it comes to replacing single glazed windows.

Do I need Planning Permission For uPVC Windows?

Planning permission isn’t always needed for UPVC windows but if you happen to live in a listed property or Heritage area, then your home might not be covered by Permitted Development Rights.

Window Designs

Achieving the perfect look for your home is easy thanks to a wide choice of window designs. From Sliding Sash Windows to Flush Casement and Tilt and Turn styles, you will be amazed at the range on offer.

Casement Windows

Attached to a frame by one or more hinges and typically hinged at the side, a casement window is the most commonly seen window installed in UK homes.
A popular choice, they are hugely versatile and come in a variety of styles. The most common being the simple side and top hung.

replacement windows

French Casement Windows

French casement windows are another variation of this style. Like French door counterparts, they open wide giving way to wide and unobstructed views. Typically installed in kitchens, these windows are installed for their ease of use.

replacement windows

Sliding Sash Windows

If you are looking to maintain the traditional appearance of your home, then sliding sash windows are the go-to option. Modern sash windows are built with an advanced operating mechanism making them easy to use, with no heavy lifting involved.

replacement windowsGiving you the very best of style and functionality, these replacement windows allow you to maintain a touch of the traditional whilst ensuring your home is warmer, safer and protected against the elements all year round.

Why compromise great looks for functionality when you can have both?


Tilt and Turn Windows

Tilt and turn windows never fail to impress. These stylish and contemporary windows provide safe and effective ventilation, without compromising on aesthetics.
These windows can be tilted inwards for safe cleaning as well as giving you the option of a tilt only angle. This dual functionality makes them ideal for high rise accommodations.

replacement windows

Glazing Options

The glass you choose is just as important as the window itself. Your installer will be able to recommend the best glass for your project.
Your double glazing can also include Georgian or Astragal or Leaded bars for a more traditional feel.

Other options include obscure glass, decorative glass, fire-safety glass and solar control glass.

Replacement Windows & Energy Ratings

Window energy ratings allow you to compare the energy efficiency of different windows and glazing.
Energy efficient windows can help reduce heat loss, saving you money in the long term. However, windows that provide a poor level of thermal efficiency will be a source of heat loss.

Window energy rating labels are like those used as energy labels on home appliances. Letter ratings are given to a window based on the energy performance of the whole unit. This includes the frame material, frame design, glass type and other components.

Ratings range from A – C with ‘A’ being the most efficient.

There are many energy rating schemes for windows, the most widely known being the British Fenestration Rating Council, the British Standards Institute and CERTASS.

What Are Standard Window Sizes In The UK?

Here are some standard casement window sizes and prices. Please note that these are simply guide prices. The replacement window cost will depend on the chosen installer.

UPVC Casement Window Prices (Fixed Window)


Casement Window Size Colour Guide Price
500mm x 500mm White £150 – £175
500mm x 500mm Wood Grain £175 – £200
1000mm x 500mm White £175 – £200
1000mm x 500mm Wood Grain £200 – £250
1000mm x 1000mm White £200 – £250
1000mm x 1000mm Wood Grain £225 – £275
1200mm x 1200mm White £225 – £275
1200mm x 1200mm Wood Grain £250 – £300


Frequently Asked Double Glazing Questions

Frequently Asked Double Glazing Questions

Do UPVC Windows Need Trickle Vents?

Trickle vents are not a requirement, however they do offer additional ventilation without the need for opening your windows so can be a valued add on.

How Long Do Aluminium Windows Last?

Aluminium windows have a long life span and should last about 20-30 years. Any type of window will require some maintenance but overall aluminium windows are extremely strong and durable.

What Colours Do Aluminium Windows Come in?

There is an infinite range of aluminium colours available for your windows and doors. The aluminium RAL colour chart consists of virtually any colour you could think of, allowing you to achieve the perfect look for your home.

What Are U-Values?

A U-value measures how effective a window or door is as an insulator of heat. The lower the U-values the more energy efficient the aluminium window or door is.

How Long Will It Take To Install My Casement Window?

Because every job is different, it is best your talk to your double glazing installer who will be able to give you an exact timescale.

Are There Other UPVC Casement Window Styles?

Other UPVC casement window styles include the French casement window which is a more traditional take on the standard casement style.

Will I Have A Choice of Casement Window Locks?

A high security lock will be fitted as standard with your new casement window but your double glazing installer will also offer a choice of security upgrades.

What Are Flush Casement Windows?

Flush casement windows are where the unit sits flush to the frame, creating a super sleek look.

Are There Different UPVC Casement Window Sizes?

UPVC casement windows come in a wide range of sizes to suit your property. You can specify your casement window size in our window cost calculator to get a unique window price!

Can I Choose My Casement Window Handles?

Your double glazing installer will offer you a choice casement window handles and casement window hardware options so you can achieve the perfect look.

What is a Casement Window?

A casement window is attached to its frame by one or more hinges. A casement window is hinged at the side allowing them to open extremely wide. These windows can double up as emergency exits and are perfect for hard to reach places within the home, with many home owners installing these windows behind their kitchen sinks.

Where Can I Get A Tilt and Turn Windows Price?

You can get a tilt and turn windows price using our window cost calculator which will give you a free and unique quote within a matter of minutes.

How Does The Tilt and Turn Window Mechanism Work?

The tilt and turn window can be ‘tilted’ inwards due to its unique turning action which allows the window to be easily accessed from both inside and out. All it takes is a swift turn of the handle.

How Much Do French casement windows cost?

The cost of French casement windows will vary depending on installer but you can get an average casement windows cost using our free online quoting engine

How do UPVC Sash Windows Work?

UPVC vertical sliding sash windows are built to either slide vertically downwards or upwards. This opening function makes the UPVC sash window much easier to use compared to traditional wooden windows where the only choice is double hung and single hand.

Are UPVC Sash Windows Easy To Use?

UPVC sash windows are very easy to use. Their spiral balance mechanism allows for smooth operation so you can open and close your windows with ease. UPVC sash windows are also incredibly low maintenance and require very little cleaning.

Why Should I Choose a UPVC Sash Window?

UPVC sash windows are incredibly attractive and make a stunning addition to any property and are relatively low maintenance thank to their UPVC design. You can enjoy a traditional aesthetic for many years to come thanks to their long standing properties.

Replacement Sash Windows In A Conservation Area

If your home is a listed property or within a conservation area then you will need to seek planning permission.

How Much Do Aluminium French Doors Cost?

Unfortunately our online quoting engine does not quote for aluminium however you can get a price by calling one of our advisors on: 0800 015 5679. Or alternatively, you can contact us using our online enquiry form.

Bay or Bow Window?

Simply put, it really depends! Bay windows offer often much welcome and useful extra storage space to the frontage of homes. On the other hand, bow windows provide a curved shape alternative in terms of look compared to bay windows. They are both beautiful options and can add much character and charm to the right property.

Can Bay Windows Look Modern?

Bay windows can easily be either modern or traditional depending on the combination of glass and / or coloured uPVC profiles now available. Subsequently, its easy for these windows to seamlessly blend in with contemporary or old properties.

Can Double Glazed Windows Reduce My Heating Bills?

When you install double glazing in your home or commercial property, it is likely that the extra heat retention will lessen the need to use central heating systems. In turn, this could mean you see a drop in heating bills. If you are concerned about your energy bills, it is easy to compare business energy or home energy online.

What Makes Flush Sash Windows Different?

Flush sash casement windows are specifically designed to imitate the appearance of traditional wooden timber windows by appearing to have the same sashes that finish 'flush' with the outside face of the window.

Should I replace my old sash windows?

Sash windows are a key feature for many traditional period buildings. Sash windows were traditionally built using timber, which is fairly high maintenance and has a tendency toward rotting and warping. Over time, these windows can become draughty and insecure. uPVC sash windows are a great way to experience the benefits of modern double glazing, without sacrificing the aesthetic of your home. uPVC sash windows will not rot or warp and require little maintenance. They are also thermally efficient, which means that your home will not require as much heating.

How much does sash window restoration cost?

The cost of sash window restoration will depend on the survey result. Standard draught proofed sash windows (without sill replacement) usually starts at about £500 per window. The time taken will also depend on the survey result.

Can I install double glazing into my original sash windows?

This will depend upon what type of window you have. Replacing existing moving sashes with new, double glazed replicas might to be possible.

How much does it cost to replace a sash window?

The cost of replacing a sash window will depend on many factors including: style, size, material and glazing. A wooden sash window will cost significantly more than a uPVC sash window. A wooden sash window can cost up to £1000. Wooden windows are more expensive to manufacture so expect to pay that bit more. uPVC sash windows can be designed to mimic wood and are much cheaper in price. The starting price for a standard uPVC sash window is on average £525.

Replacement Window Prices