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A guide to replacement double glazed window options and costs

Double glazed windows are used on a huge variety of properties. Windows is another name for double glazing. In the UK a huge percentage of people have windows made out of the material UPVC. This is why a lot of people when looking to install new windows at their home will call them upvc windows.

In fact, you will find very few modern buildings that are not already reaping the many benefits that come hand in hand with double-glazing.

The vast majority of UK homes now have double glazed windows, especially as they are renowned for improving the energy efficiency of properties.

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What is a double glazed window?

A double glazed window uses two sheets of glass, which are strategically placed with gap between them, in order to create an insulating barrier. Delivering a high level of energy efficiency, double glazed windows are also widely considered as a long-term investment as they will also improve the security of your property and sound proof a wide range of spaces.

The insulting barrier is created by filling the glass panes with heavy inert gas such as Argon, Krypton or Xenon, or in some cases a vacuum. You will also find a huge variety of frame materials, which suit both contemporary and traditional homes.

Although all double glazed windows are energy efficient, they do vary in their energy efficiency, so this is definitely something that you should bare in mind when looking for the right double glazed windows for your property.

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How Much Does Double Glazing Windows Cost?

Like many home improvements, the cost of double glazing varies massively and prices are dependent on the company you choose to supply and install your new windows.

With this in mind, it certainly pays to shop around when it comes to finding the right double glazed windows for your property. Recent price comparison research has revealed the average prices for uPVC windows. For a 60×90 UPVC double glazed window it tends to be around £350-£500 and if you are looking for bigger 90×120 windows, you can expect to pay around £525-£750. Of course, where you live in the country and the size of the double glazing company you contact will also affect the price of your replacement windows.

So, if you are living in a small apartment and are looking to change your windows, replacing your windows will cost in the region of £1,400-£2,000, and if you are looking to update your double glazing in a 3 bedroom house where you will need around 12 windows, you can expect to pay a quote for replacement windows that is between £5,250 – £7,500.

But that’s not all… there are a number of other factors that could affect the price of your windows including:

  • The size of your property
  • Your bespoke requirements
  • The choice of style and decor you choose
  • Energy efficiency rating
  • The type of glazing used
  • Grants available

You will be able to choose from a whole host of window styles, frames, colours, as well as many decorative glass options too. And depending on the company you choose, you can even create your own personal stained glass design! Take a read of our guide to replacement windows to see what else can be customised with your new windows.

There are also many different frame options to choose from too including:

uPVC frames – These are the most common type of frames in the UK, and are perfect for enhancing a modern home in a contemporary setting. Available in a wide range of sizes, shapes and colours, this type of frame requires virtually no maintenance and uPVC windows are secure and robust. Here’s our guide to the top 10 advantages of uPVC windows and uPVC window prices.

Composite frames – Embracing the very latest innovative technology, composite frames are designed to replicate 19th Century timber windows.

Wooden frames – A great option for more traditional homes, wooden windows are fantastic insulators, keeping your home warm and snug all year round. However, you will need to maintain them on a regular basis.

Aluminium or steel frames – Strong, lightweight, and aesthetically pleasing, Aluminium frames are virtually maintenance-free and can be painted in any colour to suit the style of your home.

Read our guide for a more in-depth comparison of the replacement window materials that we offer.

Of course, you should always shop around and do your research! Most reputable double-glazing companies will also be more than happy to provide you with examples of their work, so don’t be afraid to ask for case studies or testimonials.

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Why use double glazing?

There are many benefits that come hand in hand with double glazing windows and doors and although double-glazing isn’t a cheap investment, in the long run, you will reap many financial rewards.

This is because double glazing is renowned for saving you money by reducing your energy bills by retaining 10% more heat in your home. But that’s not all… double-glazing will also significantly improve the security of your home, which in turn, could also save you money on your insurance premiums.

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A top hung casement window in white that is half open

Advantages of investing in double-glazing

Warmer during the winter months – When the weather is freezing outside, there is no better feeling than escaping the cold in the comfort of your own home, right? And double-glazing is ideal for keeping the heat inside your property. But that’s not all… double glazed windows can also store a large percentage of heat from the winter sun, meaning you won’t have to keep your heating on for as long during the winter months. This also means you will be able to reduce your energy bills and improve your carbon footprint.

Reduce noise – One of the main advantages of double-glazing is that it can also significantly reduce outside noise, allowing you to enjoy a warm, quiet and tranquil space. After all, if you live by a busy road or in the heart of the city, noise pollution can often be an issue. The good news is high quality double-glazing can reduce outside noise by up to 60%!

Increase the value of your home – Investing in double-glazing is a great way to increase the value of your home, especially in older properties.

Reduce condensation – Condensation can be a major problem in a wide range of properties, especially in older homes where mould and mildew can cause significant damage. However, double-glazing is a great way to prevent and reduce excess moisture forming on your window frames and other areas of your home.

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How to find the best double-glazing suppliers in the UK

Purchasing double-glazing is one of the biggest investments you can make in your home. With this in mind, it’s important that you take the time to do your research when it comes to weighing up your options and choosing a reputable company that will offer you the best value for money.

You will quickly discover that there are hundreds of companies up and down the UK, so it’s vital that you take the time to compare direct quotes to ensure that you are able to get the very best deal for your needs.

Read our guide on how to make sure you choose the best double glazing installer in your area.

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Here are our top tips on choosing the best double-glazing supplier in the UK.

  • Reputation
  • Guarantee
  • Accreditations
  • Security
  • Value for money
  • Performance
  • Energy rating A+
  • Reputation


    Reputation is everything, especially when it comes to home improvement companies. After all… entrusting anyone to make adjustments to your home is a big deal. With this in mind, as part of your research, you should ask the companies you contact for customer reviews and testimonials, as these will speak volume about the type of company they are and the quality of their work.

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    A reputable double glazing company will always offer a guarantee, which is always at least 10 years, so make sure you check!

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    Check accreditations

    Again, this is something that you should be aware of when it comes to looking for a double-glazing supplier operating within your area. As a general rule of thumb, you should always opt for a FENSA double-glazing registered company as this is the industry standard for compliance with building regulations associated with replacing window and doors.

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    Thanks to advances in technology, windows and doors are now more secure than ever before, and a reputable, customer focused company will offer doors and windows that boast the latest security features.

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    Value for money

    Best value for money

    Upgrading your windows is a big investment, and when researching double glazing companies, you should pay close attention to whether or not you are getting the best value for money. You’ll probably find that smaller, local double-glazing companies charge less than larger companies, as they have fewer overheads and tend to offer a higher quality service without the high price tag!

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    Performance is key when it comes to optimising efficiency, durability and longevity. With this in mind, check out the brands the company uses in order to gauge the quality of materials. After all, if the double glazing company you have touched base with use low quality materials, this could end up costing you more in the long run if you have to cover the costs of repairs and maintenance.

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    Energy rating A+

    Energy rating A+

    All properties lose heat, which is why it is so important to incorporate energy efficient solutions into your home, especially when it comes to optimising comfort and keeping your bills down! With this in mind, make sure that the double glazed windows you choose have an energy rating of A +.

    The key to finding the best double-glazing company is to shop around. Every homeowner has different requirements and budgets, so by doing your research, you’re sure to find a company that is right for you!

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    How much could you save with double glazed windows?

    Double-glazing is an excellent investment, especially when it comes to saving you both energy and money!

    This is because double-glazing is constructed in a way that offers a high level of thermal insulation in your home due to its airtight components, which help to reduce the flow of heat in and out of your property. This means that you will need less energy to control the temperature of the spaces inside your home.

    And of course, this also means that you will be able to make significant savings on your energy bills too, which is always a bonus! In fact, it is estimated by the Energy Saving Trust (EST) that if the whole of the UK invested in double-glazing windows, they could collectively save around £700 million in fuel bills.

    However, you should also be aware that different types of double glazing will provide different levels of energy savings, so it’s definitely worthwhile investing in double glazing windows with a higher energy rating in order to save money on a long term basis.

    What’s the lifespan of double-glazing windows?

    This depends on the quality of the windows, the materials used, the depth of cavity between inner and outer pane, and the installation process, which is why it’s important to always do your research. Generally your windows should last at least 20 years!

    What to look out for in a new window

    Your new windows should not only keep you safe, warm and secure, but they should also be aesthetically pleasing and complement the style of your property!

    So when it comes to buying your windows, there’s a lot to look out for and consider.

    The best double glazed windows, should allow you to enjoy the following benefits:

    • Allow a good amount of light into your home
    • Be aesthetically pleasing
    • Easy to maintain and clean, without it costing the earth
    • Add significant value to your property
    • Come complete with glass that cannot be removed from outside of the home
    • Fit your property perfectly
    • Keep out draughts
    • Withstand the demands that come hand in hand with everyday life
    • Withstand natural elements and severe weather conditions
    • Optimise security with multi-point locks and mechanisms
    • Have a high energy rating to reduce energy bills
    • Add value to your home

    Disadvantages of double-glazing windows?

    As you can see there are many advantages of double-glazing windows, making them a sound investment for any property.

    The only disadvantage of double glazing windows is that they can be difficult to repair, which is mainly due to the air tight space between the two panes, which if broken, can cause condensation to form between them.

    However, the vast majority of double glazing companies offer a 10 year guarantee, and your windows should last for at least 20 years if you choose the right supplier!

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    Your questions answered

    Is double glazing easy to break?

    Double glazing is not easy to break, so you know that your home will be secure. The argon gas within the double glazed window panes works as shock absorbers, which means your double glazing is difficult to break.

    Is double glazing a good investment?

    Double glazing prevents heat loss in your home to make it more energy efficient. It also has excellent sound insulation properties and keeps your home safe and secure. This makes double glazing highly desirable.

    Does double glazing last for a long time?

    Double glazing has an average lifespan of around 20 years. This will depend on the materials and the specifics of the installation. The energy efficient improving argon gas will eventually leak out over time.

    What are the benefits of double glazing?

    Double glazing makes your home more energy efficient by keeping in the warm air and keeping cold air out. Your home will also stay cooler in the summer. Double glazing insulates from outside noise too.

    Is double glazing better than triple glazing?

    Double glazing is a significant upgrade to single glazed windows. Triple glazing may be worthwhile if you live on a very busy road or under a flight path. But double glazing offers many benefits for all homes.

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    Please read this privacy policy before using the website.

    In this privacy policy references to (“we” “us” and “our”) is to Leads 2 Trade Ltd. Leads 2 Trade Ltd is incorporated in England with number 063990 and its registered office address is A18 The Embankment, Riverview, Heaton Mersey, Stockport, SK4 3GN. We provide a price comparison website called References to “you” and “your” are to the individual reading and using our website. For convenience we use the words “information” and “data” interchangeably. “Website” means “”.

    How our business works for you

    We endeavour to procure bespoke, free, no obligation quotes from potential suppliers of products and services to each of our customers, such as you, that make an enquiry via our website. This is a quote finding and supplier introduction service; we do not ourselves provide the products and services that you may require. We provide these services to consumers and businesses.

    We aim to provide 1-4 quotes within 36 hours from your online completion of an enquiry working in conjunction with data controllers who specialise in the delivery of competitive supplier quotes. The number of quotes that we will try and help you to receive does vary depending on the product or service that you are looking to receive quotes for. If we do not call you before passing your details to the companies that supply the quotes we will stipulate the maximum numbers of companies that we will pass your details to when you enter your details in our product specific web form. If you have enquired about double glazing on our website one of the companies that we work closely with is Safestyle UK plc. Depending on your postcode area and requirements we may pass your details to Safestyle UK plc. We will reconfirm this when we speak to you on the phone.

    To be able to deliver suitable quotations to you we send your personal data and the details of your requirements to potential suppliers.

    How can you save money with us?

    We offer a price comparison service. All of the companies that we deal with know that you are conducting a comparison, hence they will often offer cheaper prices, for example on labour, than they would were they approached directly by a customer, hence our service has the potential to get you big discounts.

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    To provide our service we first explain in more detail how we use your personal information so that the consent you give us, which is detailed in the next paragraph, is fully and fairly informed.

    You give us consent to use your personal information as outlined in this privacy statement when you manually enter information about yourself on our website and submit it as a request to receive our quote finding service. This consent allows us to use your data as described in this statement of privacy policy. If you do not provide your consent by submitting your details / clicking on submit we will be unable to provide our quote finding service to you.

    You may seek further information about the scope of the consent as well as vary or withdraw your consent as outlined under the heading “What are my rights in relation to the personal data that you hold?”

    What information do we collect?

    We obtain personal information and business information (for business products and services) about you, only from you, and do not acquire information about you from anyone else.

    Data entry

    First, to provide our quote finding service we will ask you manually to supply us via the website with your personal details namely: First Name, Last Name, Email Address, Telephone Number, Street, House Number, Post Code and Company Name (for business products & services). You may also be asked on the website and by follow up telephone call for further information to help us process your request for quotations.

    IP address

    Second, information is obtained electronically when one computer connects with another across the Internet as when you visit our website such as such as your computer’s unique numerical Internet address (IP address). Information so obtained while necessary to the operation of and communication between computers may well also allow you as owner of the information to be identified, much like a name and address, and thus constitute personal data. The law requires such information to be identified and so far as practicable, for informed consent to be given by you, before the electronic information is passed from your computer to ours. Further explanation about the automatic electronic collection of your information is provided under the heading “Your electronic information”.

    We do not use your IP address to identify you personally but these logs may contain unique identifiable information left by your computer.

    We may use IP addresses to ensure that we are not receiving fraudulent registrations from the same IP address as evidence in the event of being challenged for unsolicited marketing. The IP address log would show that a registration took place on a given day.

    How does our service work?

    We provide our service to both consumers and businesses. The way the service works is very similar but due to the nature of the products and services and the suppliers of these, the processes are slightly different. From your perspective, you will receive the same level of service from us and your expectations in terms of receiving quotations from appropriate suppliers that you can then choose from are the same.

    The processes how your data will be used are explained below.

    Consumer products and services

    After you submit your details we may phone you to discuss the products or services you seek from a suitable supplier, to check we’ll be able to meet your needs and, should you still wish to go ahead with us, to get you free and no-obligation quotes. This will normally be us but below explains how it works with the different products and services that we are able to help in the quoting process with.

    At times we work as the appointment booking agent for the companies working on our network so even if you have requested direct contact from the company you may still receive a call from us in order to book the appointment for your quotation.

    Business products and services

    Enquiries for business products and services are handled by Leads 2 Trade Ltd.

    If you have come to CompareCompanies looking for businesss products or services Leads 2 Trade will transfer your business and personal details on to up to four companies. Before passing your details to up to four companies we will check your details and match your details to a number of businesses to find the best deals. The businesses may contact you by email, telephone (including automated calls) and/or SMS. Quotations may be provided to you by appointment or electronically and you will be told over the phone how you can expect yours to be delivered.

    How we get the quotes using your details

    Consumer products and services

    We take your details and pass them on to one or more companies that can provide the type of product or service that you are looking for and will invite those companies to submit quotes for your consideration.

    We pre vet all companies that join our quote finding service as potential suppliers to our customers, such as you, to ascertain as best we can that they will be suitable for your requirements and will keep your personal data safe. However, the final responsibility for determining suitability to supply the product or service lies with you, the customer, when considering the detailed quotations and deciding if you wish to contract with a given supplier or suppliers.

    Business products and services

    We take your business and personal details and pass them to a specialist business solutions price comparison data controller. They will check your details and match your details to a number of businesses to find you the best deals.

    They pre-vet all companies that join our quote finding service as potential suppliers to our business customers, such as you, to ascertain as best we can that they will be suitable for your requirements and will keep your personal data safe. However, the final responsibility for determining suitability to supply the product or service lies with you, the business customer, when considering the detailed quotations and deciding if you wish to contract with a chosen, given supplier.

    Do you offer a guarantee or warranty for the products and services I eventually buy through your suppliers?

    We are not responsible for the standard of work carried out by the suppliers that provide you with quotations as a result of your enquiry via our site. There is no warranty provided by us, implied or otherwise for the products or services provided by any suppliers that you contract with. Individual suppliers may offer their own warranties, but these and any standards of workmanship are not in any way associated with Leads 2 Trade Ltd. or its partners.

    Keeping your details safe…

    We take the security of your data very seriously from the outset. Our web address is HTTPS. (HyperText Transport Protocol Secure) This is the protocol used to access a secure Web server. We use https:// as the prefix to our Web address rather than the common http://, so that your session is managed by a security protocol and the transmission of data is encrypted to and from the Web server.

    Secure certificates (SSL Certificates) are in place. These are small data files that digitally bind a cryptographic key to an organisation’s details. These allow secure connections from a web server to a browser. SSL is used to secure the transfer of your data to our server.

    Our server is protected by a firewall. Log in details are securely shared internally between employees.

    Any personal data held in our database is encrypted. If there are any security breaches, your data is encrypted and therefore secure.

    Each supplier to whom we pass your information in order to provide you with quotes has contracted with us to keep your data safe and use it only for the provision of a quote and, if selected by you, to provide the product or services you require.

    We always have contracts in place with the companies that we pass your details on to both to ensure that they will keep your data secure and that they comply with the rules of the GDPR (General Data Protection Regulation) which we also operate within.
    Please be assured – we will not use your details for marketing or use or pass your details to third parties other than as described in this statement without explicit consent from you.

    Finally, please note that the transmission of information via the Internet is not completely secure. Although we will do our best to protect your personal information, we cannot guarantee the security of your information transmitted to our site; any transmission is at your own risk. Once we have received your information, we will use strict procedures and security features to try to prevent unauthorised access.

    Lawful basis for processing your data

    We rely on your explicit consent to process your personal data. This means that we ask you to consent to the following use of your data:

    Business users only

    We will email or text you about similar products and services. We will only do this if you haven’t opted out of receiving such emails or texts.

    To create custom and lookalike/ similar audiences

    We like to work with Facebook, Google and other platforms (“Platforms”) to reach out to you with adverts for Other Products. We also like to use Platforms to reach out to other people who might like to use our quote request service.

    We do this in two ways. In both cases, your data, along with other data, is used to create a custom audience and/or a lookalike/similar audience. Whenever an audience is shared with a Platform, the data is first hashed and pseudonymised, meaning that any data within the audience that could identify a person is replaced with an artificial identifier. So, the process is secure. Also, we don’t share more data than we need to for the purpose of creating the audience.

    Transfers of data outside the EEA (European Economic Area)

    We share your personal data within our business and with data processors who can find suitable product and service suppliers for you. Your data will then be used to enable suppliers to provide quotations and potentially move towards a contract with you.

    Some of the suppliers that may offer products and services to you are based outside of the EEA.

    We transfer your data as detailed above with your consent.

    Data Retention Policy

    We keep your personal data for no longer than is necessary for the purposes for which it is being processed. This is to reduce the risk that it will become inaccurate, out of date or irrelevant.
    We ensure that your personal data is securely disposed of when no longer needed.

    What are my rights in relation to the personal data that you hold?

    Your rights are embodied in the contract formed between us when you visit the website (as subsequently augmented when submitting your personal information and, if you are called, when speaking on the phone) and as contained in the General Data Protection Regulations 2018 – also known as GDPR.

    If you have any questions or concerns please first read this section of the statement and then email our Data Protection Officer on, They will be pleased to assist before as well as after you may have provided personal information to us.

    You may also write to our Data Protection Officers either at our registered office address stated at the outset of this statement.

    If you need more information about data protection you might contact the Information Commissioner: see

    The GDPR provides individuals with the rights in relation to personal information about themselves which is held by us as summarised in the table below.

    Some of the rights are unlikely to be of practical use. For example, if you wish for a copy or correction or cessation of use of some or all of your personal data we, our suppliers and our other introducing companies are likely already to have eradicated it from our or their system given the short periods your date is retained and its limited use.

    Nevertheless, the GDPR principle of transparency in particular provides you with the right to enquire and to be informed and we briefly set out all of the rights here. Further information about the rights and the circumstances in which they apply may be obtained from a number of published sources and from our fact sheets which are available on request.

    Information Right – you may require us to provide a more detailed explanation of how we collect, process and use your personal information.

    Personal Data Access Right – you may require us to provide an electronic copy of your data free of charge.

    Personal Data Correction Right – you may require us to correct your personal information as held by us.

    Personal Data Erasure Right – you may require us to permanently erase the personal data that we hold about you.

    Data Processing Restriction Right – you may require us to stop using your data for particular purposes such as mailing or profiling.

    Data Processing Objection Right – you may require us to suspend using your data if for example it is incorrect or you simply wish to withdraw your consent.

    Data Portability Right – you may require us electronically to transfer your personal information to another supplier, for example to facilitate switching.

    Automated Decision-Making Right – you may require us not to make decisions about you relying solely only on a computer decision.

    Breach Notification Right – if in the unlikely event there occurs a breach of security which is likely to result in a high risk to your rights as a data subject, we must inform you without undue delay.

    How else can we help?

    Rights aside, if you have a change of heart and do not wish us to pass your information to potential suppliers or another introducing company please let us know immediately by email or, should we call you, during our phone conversation and we will remove your information from our and their systems.

    You are not bound to enter into a contract with any supplier that provides a quotation to you and can unsubscribe from any communications related to your enquiry from them or us at any time.

    If you have any questions, please email

    Your electronic information

    Your electronic information means information relating to you, which may or may not be capable alone or with other information of identifying you of the kinds illustrated by what follows in this section. Your electronic information is obtained by us in by: (A) the use of cookie devices lodged within your computer (B) information disclosed by your browser and (C) features of your computer recognised and “remembered” by ours.

    A) Cookies

    Cookies save you from re-entering information when you return to the site. This other data is collected by cookies from your navigation around the site. A cookie is a small amount of data, which we send to your computer. The data is then stored on your browser or hard disk. Most web browsers can be set to prevent you from receiving new cookies, notify you before accepting cookies or disable cookies altogether. Details about this can normally be found in the Help facility provided with your browser. If you disable cookies, you will not be able to receive personalised facilities. If you do not want your visits to our website to be monitored in this way you can disable certain cookie functions as described below: If you wish, you can usually adjust your browser so that your computer does not accept cookies. If you do this, you will still be able to browse around the site but certain functions will not be available. Alternatively, you can adjust your browser to tell you when a website tries to put a cookie on your computer. How you adjust your browser to stop it accepting cookies or to notify you of them, will depend on the type of Internet browser programme your computer uses. If your computer uses Microsoft Windows Explorer or Mozilla Firefox, you will need to follow these instructions after clicking onto this link Go to the heading “Manage Cookies”. Click onto the option you prefer, either stopping cookies being installed, or notifying you of them. From the list provided, click onto the programme, which your computer uses. If this is not shown on the list, click on the “help” heading on the bar at the top of this page, search for information on “cookies” – an explanation of how to delete cookies will appear, then follow these instructions.

    B) IP Address

    Your browser generates other information, including which language the site is displayed in, and your Internet Protocol address (“IP address”). An IP address is a set of numbers which is assigned to your computer during a browsing session whenever you log on to the Internet via your Internet service provider or your network (if you access the Internet from, for example, a computer at work). Your IP address is automatically logged by our servers and used to collect traffic data about visitors to our web sites. We do not use your IP address to identify you personally but these logs may contain unique identifiable information left by your computer.