Disclosure: FMB Home Picks is committed to delivering independent advice and reviews on home products and services. When you purchase through links on our site, we may earn an affiliate commission. Learn more.

Double glazing can lower your energy bills, increase your property value, reduce noise and even add extra security and protection to your home. However, not all double glazing companies offer the same features, styles, or even guarantees you might be looking for. 

Over the last six months, we’ve analysed the services and products of dozens of the top double-glazing installers in the UK and read more than 3,000 third-party customer reviews from sites like Trustpilot and Which.co.uk to help us identify a list of the top five best double-glazing companies in the industry. If you are looking at putting in new windows, this is the best place to start. 

What are the best double glazing brands?

  • Best overall: Anglian Home Improvements 
  • Best guarantee: Everest 
  • Most sustainable: Safestyle
  • Most cost effective: Britelite
  • Best payment options: Britannia
VIEW MORE

Anglian Home Improvements: best overall double glazing company

anglian windows fitted at a property

Image credit: Anglian

  • Guarantee options: 10-Year guarantee offered on all parts and labour, 15-year guarantee offered on gas-filled windows 
  • Price range: from £250 – £910 per window
  • Energy efficiency rating: A++ on all uPVC windows 
  • Secured by Design rating: SBD-accredited on Tilt and Turn, Casement and Sliding Sash Windows

Anglian received our top rating as the best double glazing company for a number of reasons. Anglian offers a variety of styles and materials (including uPVC in a number of finishes, wood, and aluminium), decorative glass options and nifty safety features, including shoot bolt locks, key locking handles, excluder devices, and multi-point locks. 

Previously branded Anglian Windows, the company has been in business since the 1960s and is considered a market leader, fitting more than half a million products every year. Anglian also places emphasis on economic and environmental sustainability: all products hold the Made in Britain mark, and the company is part of the Recovinyl Plus initiative that focuses on PVC recycling. 

Fair payment options, bespoke design options, impressive accreditations and highly positive reviews led us to give this company top marks as double-glazers. Window styles include casement, flush, cottage, sash, and tilt and turn windows. And buyers can choose from a variety of Scandinavian-inspired styles and colours, including wood finishes. 

Cost

Anglian doesn’t provide a public price list, and customers can request free quotes online. However, according to our research, the average cost of a 60cm x 90cm window runs as follows:

Material

Cost

uPVC

£250 – £570

Aluminium

£500 – £605

Composite

£575 – £625

Wood

£845 – £910

Our recommendation

Anglian’s real speciality is customisation and beautifully designed products for cash buyers in a variety of styles. They do offer some credit terms, but at an APR of 9.9%, it’s not as favourable as some of their competitors (particularly brands like Safestyle and Britannia that bring interest-free terms and Buy Now, Pay Later plans to the table). 

Security-conscious buyers will also find a lot to like about Anglian’s safety features, especially their locking systems and the highly coveted Secured by Design (SBD) accreditation they hold. Anglian Double Glazing is our best overall option because of its versatility, pricing, payment options and solid guarantees. Reviewers highly rate this company and its installers. 

Visit site.

Everest: best guarantee

everest windows fitted at a property

Image credit: Everest

  • Guarantee options: 10-year, 20-year or life time transferable guarantees 
  • Price range: from £350 – £1,250 per window
  • Energy efficiency rating: A+ on uPVC casement windows
  • Secured by Design rating: SBD Accredited 

Everest comes a close second for the best overall double glazing company category. Founded in 1965 as Home Insulation Ltd in Waltham Abbey, the brand is one of the oldest double glazing companies in the UK. It holds the highest Trustpilot rating (4.3 stars) out of the brands on our list, with stellar reviews praising its customer service, reliability and designs. 

Everest isn’t the most affordable double glazing company on our list, but it’s probably your safest bet, with an impressive list of accreditations and memberships, including Made in Britain, Secured by Design, Quiet Mark, FENSA, TrustMark, BSI, BFRC, FSC, and BSI Kitemarks. That, in addition to transferable guarantee options (including lifetime guarantees), makes Everest a solid choice for buyers that want quality and reliability from their double glazing company. 

Cost

Like Anglian, Everest doesn’t make its pricing available on the website (aside from giving an average price range of between £500 – £3,200 per window), but we’ve used a few comparison sites to arrive at an average cost of a 60cm x 90cm window. 

Material

Cost

uPVC

£350 – £570

Aluminium

£500 – £605

Wood

£845 – £1,250

Composite

£575 – £625

Our recommendation

Everest is the best option for cautious buyers that prioritise quality and peace of mind over everything else (including price). While Everest does offer a choice between uPVC, wooden and aluminium windows, it offers fewer design options than the likes of Anglian and Britannia. Everest really has the edge over its competitors when it comes to cover. It not only holds an impressive list of accreditations (the most thorough of any double glazing company we’ve reviewed) but offers extremely attractive, long-term guarantees that are transferable between homeowners – adding value to the property if you would like to sell down the line. 

The 10-year guarantee comes standard for all parts and materials as well as issues resulting from faulty workmanship, including fogging and condensation. A 20-year guarantee is offered on all uPVC Exclusives windows, free of charge, covering discolouration and fogging. The Lifetime Guarantee comes with a small charge but provides total peace of mind and access to lifetime cover against fogging and condensation on your windows.

Visit site.

Safestyle: most sustainable

safestyle window in a suburban house

Image credit: Safestyle

  • Guarantee options: 10-year standard guarantee (excluding handles) 
  • Price range: from £250 – £1,050
  • Energy efficiency rating: A-rated 
  • Secured by Design rating: not currently SBD-accredited 

Safestyle was founded in 1992, marking it as one of the youngest double glazing companies on this list. Still, it’s one of the largest installers in the UK, with double glazing sales of over £100 million. It offers a range of doors, windows, and conservatories. Unlike Everest and Anglian, the company focuses exclusively on uPVC (but in a number of finishes, including wood finishes). 

Safestyle offers good value for money, is well-rated online, and offers extremely flexible credit and payment options to budget-savvy consumers. However, its main differentiator has to be its dogged commitment to sustainability and environmental friendliness. 

The company operates its own Safestyle recycling centres across the UK and buys back old windows from customers. The company manages to recycle 80 tonnes of scrap glass, 5 tonnes of scrap metal, and 500 tonnes of uPVC offcuts every single month, while wood is converted into biomass heating fuel. The company announced its intention to recycle all of its waste by 2024.

Cost

Because Safestyle doesn’t offer wood or aluminium products, it’s hard to compare pricing with Everest and Anglian, but we can compare the average cost per window style. While Safestyle isn’t the cheapest, they do offer a price match guarantee (provided the competitor’s product matches the style and material of the window they’ve quoted on). 

Material / Type

Cost

Casement

£250 – £570

Sash

£500 – £1,050

Tilt & Turn

£400 – £675

Bay

£400+ per section

Our recommendation

Several online reviews have criticised Safestyle’s sales team for pressuring consumers to buy the more expensive options available, and have even received fines for their aggressive tactics in the past. SafeStyle seems to have turned this around and even received an award for ethical and professional selling.  Officially the company offers the lowest price guarantee, which means you can  match deals and promotions, as well as extremely flexible financing deals funded through Barclays Partner Finance.

This includes a 24-month interest-free credit deal with 0% APR, a 12-month Buy Now, Pay Later scheme with 19.9% APR, and several interest-bearing credit options. The interest rates are fairly high, but there are no deposits and flexible terms, which makes it a solid option for individuals that want to improve their home and pay on credit. 

It comes with a bare minimum warranty of 10 years, as required by FENSA, and buyers can choose between several styles, glass options and 27 different colours. It’s a great option for buyers that need to make a big purchase on credit or want to lower the carbon footprint of their home renovations through recycling. Safestyle’s numerous recycling options and their use of recycled material makes this a great choice for the environmentally-conscious homeowner. 

Visit site.

Britelite Windows: most cost-effective

britelite windows fitted at a property

Image credit: Britelite

  • Guarantee options: 10-year transferable guarantee
  • Price range: from £160 – £1,050 per window
  • Energy efficiency rating: A++ on standard triple glazed windows 
  • Secured by Design rating: not SBD-accredited 

Britelite Windows has been in the double glazing business for the better part of 50 years. The company has placed a significant focus on security and energy efficiency, installing triple-glazed windows as a standard, along with a 10-point locking system. The company’s accreditations include the BSI KiteMark for window installation.

Britelite’s policy of price transparency has earned its place on the list. There are no hidden fees, and prices are always provided with VAT and fitting. Online reviewers have often remarked how much more affordable Britelite is, both in terms of its pricing and the energy savings enjoyed. 

Cost

Pricing is not available online, but we’ve reviewed pricing from several comparison sites to draw an average value. 

Material

Cost

uPVC

£160 – £450

Aluminium

£500 – £605

Composite

£475 – £625

Our recommendation

Britelite Windows is a good option for cash-strapped buyers that want straightforward pricing and installation. Britelite’s pricing is competitive and transparent, making it easier to make a decision up front. Unlike some of its competitors, Britelite is lauded online by reviewers for its simple and straightforward sales tactics. Cost savings are also enjoyed through greater energy efficiency after installation. 

On the downside, Britelite doesn’t offer a great deal of payment options, but its monthly financing option is extremely fair, with a representative APR of 8.9%. The company doesn’t offer many frills in terms of material or design, and the cover on offer is a stock-standard 10-year warranty. 

Visit site.

Britannia Windows: best payment options

britannia windows fitted at a property

Image credit: Britannia

  • Guarantee options: 10-year transferable guarantee
  • Price range: from £250 per window
  • Energy efficiency rating: A++ on certain windows 
  • Secured by Design rating: not SBD-accredited 

Britannia Windows is a well-known family business formed in 1982, covering most of South and South West England. While the company holds mixed reviews online, they have a solid reputation, addresses customer service and negative reviews head-on, and utilises a network of installers to ensure swift service delivery. Their contact centre service hours are also extremely favourable for busy homeowners. 

Britannia offers extremely flexible payment terms and several finance options, making it an attractive option for buyers that want to use credit. They also offer a huge variety of designs, colours and styles to buyers. 

Cost

Pricing is not available online, but we were able to get a range from costs reported by customers on review sites.  Pricing is generally comparable with that of Safestyle and Anglian. Most reviewers rate their costs as “fair” or “reasonable”. 

Material

Cost

uPVC

£250 – £500

Aluminium

£500 – £605

Composite

£475 – £625

Our recommendation

Double glazing is a long-term investment, and many homeowners require finance when making a purchase of this size. Britannia Windows is a good option if you require financing. It offers low-cost monthly financing, a Buy Now, Pay Later repayment scheme, and 0% APR on purchases over £3,000. 

The company is known for beautiful showrooms in a number of convenient locations, friendly service and efficient installation, making it a solid all-round option. As a smaller business (compared to some of the others), their range of design and colour options is impressive. 

Visit site.


How to find the best double glazing company

Double glazing is one of the most popular home improvement methods, but there are horror stories of poor fittings, noisy vents and even long-term damage to the home. Before deciding on a double glazing company, consider the following factors:

1. Experience 

Look for a double glazing company that has been in business for several years – the longer, the better. Longevity is a good indicator of expertise and reliability. 

2. Customer feedback

Customer reviews made up the bulk of our research. It’s important to read all customer reviews and testimonials, on third-party sites, before making a decision. The company’s response to negative reviews should also factor into the decision. 

3. FENSA registration

Always ensure that the double glazing company is FENSA-registered and compliant with building regulations. This will  save you time and money registering your window installation (as the company will do this for you) and provides peace of mind that the company has been thoroughly vetted. 

4. Security

Windows are an easy access point for burglars. Ensure that your double glazing company provides a multi-lock point system or other security measures that protect your home. 

5. Guarantees

All double glazers must offer a minimum 10-year guarantee on their labour and materials. The longer the guarantee period, the better. 

6. Value for money 

Value for money and price transparency are important. It’s not unusual for companies to inspect a home before providing a quote, but they shouldn’t charge for every little inspection or hide extra costs in the fine print. Quotes should be provided with no obligation. 


Why should you install double glazing?

Increased energy efficiency 

If you want to cut down your heating bills, double glazed windows can improve the thermal insulation in your home, keeping it warmer. This will ultimately reduce your reliance on central heating. Look for an A++ rating to maximise energy efficiencies. Of course, energy efficiency is also impacted by a number of other factors in the home, including the type of boiler you’re using, the insulation in your roof and flooring, and the light fittings and appliances used. It’s worth re-examining other contributors to energy efficiency within your home if you aren’t realising the savings you would like. 

Security 

Double glazed windows are harder to break than single glazed windows, providing extra security and protection as well as advanced locking mechanisms. 

Reduced condensation

Water vapour builds up in the air and surfaces on your glass, which can lead to unpleasant dampness and mould in your home. Double glazed windows reduce condensation and prevent the build-up of water vapour. 


Conclusion

After hours of research, we’re confident that this guide will help you find the best double glazing for your home. Whether they offer long-term guarantees, a reduced carbon footprint, low prices and value for money, or flexible payment terms, you can evaluate your options to find the best double glazier for your project. 


Frequently asked questions

What is double glazing?

Double glazing refers to windows that consist of two panes of glass, separated by a layer of gas. The gas makes it a poor conductor of heat, keeping warm air inside the house for longer. 

How long will double glazing last?

Double glazing lasts about 20-35 years, depending on the quality of the materials and the workmanship, but some experts believe it can last up to 40 years or longer. 

Does double glazing reduce noise pollution?

In many instances, double glazing can reduce noise, such as on busy highways or rail lines, dramatically. It does depend on the material used, however. Your double glazing company will be able to provide advice in this regard. 


Methodology

While conducting this research, we utilised a scoring system based on some of the most important factors when choosing a double glazing company. Each company was rated on their ability to deliver on these factors. 

Factors included: 

  • The type of double glazing material (uPVC, Wooden, Aluminium) for a total of 20 points;
  • The number of styles on offer for a total of 7 points;
  • The energy efficiency rating held by the company for a total of 2-5 points;
  • The level of security offered for a total of 4 points;
  • The warranty period for a total of 2-5 points depending on its length;
  • The company’s years of experience for 7 – 10 points;
  • The number of payment options for a total of 14 points;
  • The total rating score of the company held on Trustpilot for a total of 1-5 points;
  • Additional benefits (including FENSA certification, design options, customer support and the inclusion of trickle vents) for a total of 15 points. 

Each firm received a total score out of 100.