How Do Window Sizes Affect Price?

Window sizes have a significant effect on the price of new double-glazed windows. That’s because the larger your window, the more glass and materials you’ll need. If you’ve replaced large window units or double hung windows in your home before, you’re probably well aware of how much new double glazing can cost – the larger the window size, the higher the price it’s that simple.

If you’ve built a new extension or want to add more windows to an existing room, getting the right size for your needs and budget is vital. The challenge with large windows and double glazing installation is not paying more than you need to – we can help you find the most competitive prices for even large double glazed windows. Just use our online tool to get started today.

Smaller windows are the most cost-effective, as you get all of the same design and innovative features for the lowest possible price. However, you can still get a superb deal if you want or need larger windows for your home. There are unique styles like bow and bay windows that use multiple panels of glass, and you can fully customise the size of casement, tilt and turn, and sliding sash windows to control how much you spend. Design will also have an influence, as will double vs triple glazing, so size isn’t the only thing affecting price here.

For example, your choice of frame plays a significant role in how much you’ll pay when installing double glazing. Different options include uPVC, robust aluminium, or an innovative composite blend that combines uPVC, GRP, and timber – helping you recreate the look of wooden windows without any of the maintenance headaches.

Not only that, but you can choose customisable features, effectively creating your own bespoke window to suit your home’s style, energy efficiency needs, and budget. With the option to get made-to-measure models for your home, you can make sure you stay in control of your window prices.

How Do Window Dimensions Affect Price?

Window dimensions are perhaps the most significant influencer on the cost of double glazing. Small windows, such as those with 500×500 dimensions, will cost around £150 each with a uPVC casement design. However, for the same model in 1200×1200, you should expect to pay nearly double – it makes sense really as the window is twice the size, with a £285 price tag on average. So, it’s easy to increase an estimate quickly, and that’s before you factor in anything else like custom features, which will bump up your uPVC double glazing costs even further. So, what is the right window size for your home?

If you’re replacing old double glazing in your home that’s underperforming, it’s best not to try to change the size of the windows unless you’re refurbishing a particular room. A double glazing installer will charge a lot more for the installation process if they have to alter the shape of the opening for your new window.

If you want to add new windows, then a good location for these is in small, dark rooms that don’t get a lot of natural light. Your utility room, for example, might look tired and dark, while you could always add another window to a bedroom that isn’t south-facing to give it a brighter aspect.

Whatever size window you choose, you’ll still open your living space to sunlight and natural warmth. Remember, you will always get the best energy efficiency across all window sizes, helping you save money on your energy bills. All new double-glazed windows are subject to an energy rating system to help consumers choose the best energy-efficient windows for their needs.

How Do Window Frames Affect Price?

The different window materials have a crucial impact on double glazing cost, and one of the biggest influences is the choice of frame, which can really affect the price.

With new double-glazing windows, you can choose from uPVC, aluminium, or composite materials. uPVC is the most affordable of the three and is becoming the UK’s most popular material for replacement double-glazing windows.

Unlike timber, uPVC has no design flaws and is fully weatherproof. As a result, wind and rain won’t affect the strength and shape of your window, and it won’t rust either. uPVC offers far better insulation than timber, too, so you can also save money on your heating bills. uPVC offers good value for money and all the functionality and performance householders demand.

Aluminium, on the other hand, will cost 15-20% more than uPVC. However, you’ll get incredible strength and security. The material is a precious metal that is highly robust and durable. Because of this, it won’t rust in wind and rain and will protect the internal security hardware of the window, including multi-point locking systems and shoot bolts. The result is complete peace of mind regarding home security. Plus, aluminium windows also score highly for noise reduction, particularly when teamed with soundproof glass.

If you have old timber windows, you may not want to lose their authentic style compared to the relatively uniform appearance of some uPVC windows. However, you’ll also know that timber windows have plenty of drawbacks. The solution is composite windows, which combine the best of all worlds, a solid timber core protected by a weather-resistant frame made from uPVC and GRP. Composite windows are also scratch-resistant, so they keep their good looks. This is a low-maintenance design, so you won’t have to repaint the frame regularly, and you can invest in unique colours that won’t fade for decades.

How Do Window Styles and Their Sizes Affect Price? 

Casement Windows

Casement windows are the most affordable window style, and the UK’s most popular. You’ll get a design with a whole section of double glazing and slimline frames. Because of this, casement windows let in large amounts of natural light, lightening and brightening dark rooms, and giving an impression of space.

Casement windows in sizes from 500×500 to 1200×1200 cost between £143-£450. You could call this cheap double glazing, but these double-glazed units do offer excellent value for money.

Tilt & Turn Windows

Tilt-and-turn windows feature an innovative opening system. With these designs, you can tilt the glass inward, outward, or several different ways. As a result, you have more control over how you open and use your windows.

The tilting design makes cleaning a doddle, and the glass stays locked to a robust central bar even when you open it. Because of this, you can ventilate your home at night without worrying about security. Tilt-and-turn windows come in sizes from 500×500 to 1200×1200, and prices range from £400-£675.

Sliding Sash Windows

Sliding sash windows are a timeless design that adds class to any home. The windows sit flush within the frame and use weatherproof structures for an air and water-tight design. The design offers a vertical opening, meaning you can slide the sash up effortlessly to reveal wide-open space. Sliding sash windows let the world in when you open them and protect your home when you close them. They are available with traditional timber frames or as modern uPVC windows.

Sash windows are at the higher end of double-glazing prices. With the same range of window sizes above, you can get prices between £525 and £950.

Bow & Bay Windows

Bow and bay windows are an even more wide-ranging option, with large window sizes that turn your home into a stunning, natural space. Bow windows use designs with multiple panels of double glazing to create panoramic views, fitted with slimline frames that don’t obstruct your vision or interrupt the vista.

Bow and bay windows require you to extend a wall of your home outward, increasing space within that room. In the same range of window sizes as the other options, bow and bay windows have an average double glazing cost of £1050-£2300.

Bespoke Window Sizes

You can choose bespoke sizes with any window you invest in for your home. With a trusted local installer, you can create a fully customisable window. That way, you can get a made-to-measure design with all the right glazing and all those personalised features that make it unique to your home.

You’ll be able to choose a window style and customise every part of it. For example, casement windows come in millions of potential combinations, and you have a choice of bold RAL colours and authentic woodgrain finishes for your new frames. Bespoke window sizes will help you stay in control of your budget.

Online Prices for All Window Sizes

However, there is another way to control your double glazing cost. Double Glazing On The Web makes saving money on any double glazing design simple and straightforward.

With us, you can get in touch with local suppliers right on your doorstep. You won’t have to take a chance and risk working with rogue traders, wait for a national company to travel to you, or pay over the odds for your new double glazing. Instead, you can get friendly, personalised service for a window in your bespoke dimensions. Many of these companies are also Checkatrade members and Which? Trusted Traders.

Take advantage of our online quote builder today to start thinking about your unique design. Choose every part of your new window, including sizes and dimensions, styles and features, colours and finishes. Once you’ve combed through every option, you can get an instant online price for the double glazing of your choice.If you want to ask our friendly team anything, then don’t hesitate to get in touch! You can find us using our online contact form or calling us today on 0800 015 5679!

Conclusion

By thinking carefully about your double glazing needs and budget, you can determine the best balance between window size, design, and affordability. Whether you choose cost-effective casement windows, modern tilt-and-turn designs, timeless sliding sashes, or expansive bow and bay windows, there are options for every home and pocket. 

By working with a trusted local installer and exploring the numerous available options, you can create bespoke windows that maximise natural light, enhance your home’s interior and aesthetic appeal, and lower your energy bills without breaking the bank.

FAQs

How do large window sizes compare to smaller ones? 

Larger window sizes, usually around 1200×1200, can cost almost double the price of smaller 500×500 windows, which are roughly half the size. For example, a small uPVC casement window might cost around £150, and a large one would be £285 on average.

Can I save by deciding on a different window frame material? 

Yes, the choice of window frame material can impact the double glazing cost, just like the double glazing glass type you choose. For double glazing frames, uPVC is generally the cheapest option, whilst aluminium frames can cost 15-20% extra. Composite frames, which integrate wood, uPVC, and GRP, provide a balance between real fashion and offer lower maintenance, but they may be even more expensive than uPVC.

Is it more cost-effective to replace my home windows with ones of the same size or upgrade to something bigger? 

It is generally much more cost-effective to keep to the same-sized windows. Converting the opening for something larger requires additional labour and materials, resulting in higher installation prices and seriously increasing the cost of double glazing.

How can I maximise natural light in my home without choosing large, high-cost windows? 

You can maximise natural light by adding small windows to rooms without sun exposure, like utility rooms or north-facing bedrooms. Additionally, choosing window types with thin frames, like casement or sliding sash windows, helps to create a brighter, more open feel without the need for installing oversized windows, which will significantly impact the overall cost.

Are there any additional factors that may affect installation costs other than size? 

Yes, and there are several of these. Most apparent is how many windows you choose to install or if you decide to increase the window size; both of these seriously increase labour costs. Different window types attract different price tags, and of course, the higher the energy efficiency ratings offered by the glass, the more expensive the unit. Remember that personalisation features like colour and bespoke hardware always bump up the bill, and also, if you opt for specialist glazing like tinted glass or acoustic double glazing for noise reduction. All these factors impact double glazing cost, but the good news is that you can control how much you pay for new double glazing based on what you choose.