Everest is one of the largest and most popular double glazing windows installers in the UK, with over 3% of the total market share. The company designs, manufactures, retails and installs its own products in the UK, which allows them to offer a premium service.

Everest offers a range of customisable replacement windows, including uPVC, timber and aluminium frames in a number of styles: sliding sash, bay, tilt and turn and casement. The company also offers a range of opening styles, glass finishes (including double and triple glazing), colour options and decorative glass finishes, and each unit incorporates locks accredited by Secured by Design, the police security initiative that provides a recognised standard for security products. 

Everest is willing to back the quality of its products with comprehensive warranties, including a lifetime warranty that comes at an extra cost. Everest’s warranties cover many possible issues, including discolouration, condensation, rot and fungus. 

Unlike some of the companies we’ve reviewed, Everest serves most of the UK, including Jersey.

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Technical information about Everest double glazing windows

Everest is one of the most popular double glazing windows companies in the UK. The company offers a choice between uPVC, sustainably sourced timber and aluminium windows, all designed and manufactured in-house. In addition to double glazing, frosted glass, noise-reducing glass and safety glass, Everest also enables you to upgrade to triple-glazed glass for maximum energy efficiency. Secondary glazing is another option which provides discreet insulation.

  • Guarantee options: 10-year standard guarantee. 20-year guarantee for uPVC Exclusives, covering discolouration of white uPVC frames, condensation and fogging. Lifetime guarantees can also be purchased. Timber windows also come with a 30-year guarantee against rot and fungal growth. The colour finish and profile of aluminium windows are covered by an additional 25-year guarantee.
  • Price range: From £250 to £1,050 per window, depending on the style and material.
  • Energy efficiency rating: Depends on frame material and window style. Maximum energy efficiency rating of A++ on triple-glazed uPVC casement windows.
  • Secured by Design (SBD) rating: SBD accredited.
How does double glazing work?

How does double glazing work? (Image credit: Everest)

Key features of Everest double glazing windows

  • Highlights: The company holds a list of impressive accreditations, accolades and memberships, as well as a 4.3-star rating on Trustpilot.
  • Key benefit: Everest offers a wide range of window materials, styles and colours with many different glass options. You can compare windows on Everest’s useful online comparison page. The website also offers plenty of design inspiration.
  • Memberships and certifications: Made in Britain, Secured by Design, Quiet Mark, FENSA, TrustMark, BSI, BFRC and FSC.
  • Styles: Sliding sash, bay, tilt and turn and casement.

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Pros and cons of Everest double glazing

There are pros and cons to consider with every company, even one as acclaimed as Everest. Here are some of the advantages of buying Everest replacement windows:

  • Energy efficiency: Many Everest windows are A-rated, while some timber and aluminium styles have a B rating. With triple glazing, Everest’s uPVC range is rated an impressive A++.
  • Warranties: Everest windows come with a 10-year standard guarantee on all parts and materials. uPVC Exclusives are covered by a generous 20-year guarantee free of charge. You can also opt to purchase a lifetime guarantee for complete peace of mind, which can be made transferable.
  • Window styles: Everest offers an impressive range of different window styles, materials and colours so there’s plenty of choice to suit every home.
  • Noise reduction: You can opt to buy Everest’s noise-reducing glass if you live in an area with a lot of noise pollution. This glass goes one step further than double glazing as it disrupts the soundwave by using two panes with different thicknesses. It also features a laminate PVB sound-dampening core.
  • Safety: Everest windows are SBD-accredited with impressive locking systems like GrabLock, which has been developed with Yale.

Also consider Everest’s disadvantages:

  • Cost: Everest windows are more expensive than many of the other brands we’ve reviewed.
  • Limited finance options: Everest’s only finance options are personal loans or secured lending via Kandoo, a credit broker and comparison service, offering interest rates of 4.25% APR, with fixed at 9.9% APR representative. Other companies offer “buy now, pay later” and flexible monthly payment schemes.
Wood effect uPVC double glazing windows

Wood effect uPVC double glazing offers a stylishly sleek alternative to the more usual white uPVC (Image credit: Everest)

How do Everest double glazing windows work?

You kickstart your window project with a design visit with a consultant visiting your home, talking through your options and providing an obligation-free quote. Next, a surveyor will check that all the measurements are correct and confirm if the installation can go ahead safely. Your order will then be placed, with your windows being manufactured in the UK. Once this is completed, Everest will contact you to book an installation date.

After installation, you’ll receive a guarantee pack and FENSA certificate.

How does Everest compare with other double glazing companies?

Everest is an excellent window provider. It produces high-quality replacement windows and frames to customer specifications, but the company’s high window costs may put some buyers off.

If you are looking for something equally reliable but a little cheaper, you should consider Anglian. The company’s warranties aren’t as attractive as Everest, but they do offer a standard 10-year warranty on all parts and labour and a 15-year guarantee on gas-filled windows. They also offer a range of designs and colours, and all uPVC windows are A++ energy efficient.

What do Everest double glazed windows cost?

Sliding sash double glazing windows

Sliding sash double glazing windows offer a traditional look to period homes (Image credit: Everest)

Everest doesn’t publish the cost of its windows online as they are made to measure. Pricing is affected by material, size, accessories and glazing options. According to comparison sites, you can expect to pay the following:

StyleCost per window (excluding installation and labour)
CasementFrom £250 to £570
SashFrom £500 to £1,050
Tilt and turnFrom £400 to £675
BayFrom £400 per section

Maintaining Everest double glazing windows

Everest advises that windows should be cleaned twice a year in normal conditions. If you live in a coastal area or near a construction site, clean your windows more regularly. To clean your windows, use a commercial cleaning solution and soft cloth, taking care to avoid contact with the frames. Harsh steel wool and abrasive cleaners can scratch the window frames.

Wooden frames require extra care. They need to be sanded and repainted periodically, and you should avoid getting them too wet during cleaning. Any exposed wood should be treated with an appropriate product, such as wood oil, to preserve its integrity, and interior woodwork can be polished with beeswax and a soft cloth. 

What the professionals say about Everest double glazing

“Everest offers some of the most popular window styles, all in a range of materials – if you’re investing in double-glazed windows for a more energy-efficient home, then look no further. Everest’s double-glazed windows are A+ rated for uPVC windows, while triple glazing is A++ for all windows.”

“Everest is the second-largest double glazing installer in the UK with over 3% of the total double glazing market share. The company is one of the only UK double glazing installers to control every step of their production process from manufacture to retail and installation, and the only to maintain a product development team, design team, installation team, and sales team rather than contracting out labour. This gives Everest much more control over the total quality of its products, enabling the company to offer a premium experience. This is typically reflected in the price, which can be significantly higher than some other brands.”

Customer reviews on Everest double glazing

“We are repeat customers with Everest, based on our experience of product quality and the friendliness of all members of the team. The ability of the company to make windows etc. that match the appearance of originals in a house built in the early 1900s is a distinct advantage. The fitting crews are careful, professional and tidy. Aftercare is responsive and deals with any problems that are reported – we had some minor ones that were fixed with simple adjustments to fittings. Overall, we are happy customers.”

“A great service from start to finish by staff and very happy with the installation of new windows and doors. Would highly recommend Everest.”

“The whole process was very professional, and the delivery was prompt. I was very pleased with the smooth progression of the whole process, and they fitted superb windows.”

Final verdict on Everest double glazing windows

You can add colour as a modern twist to your double glazing windows.

Give your home a stunning new makeover with coloured double glazing windows (Image credit: Everest)

Everest is a leading window supplier in the UK, offering impressive guarantees, excellent energy efficiency ratings and highly secure Yale GrabLock systems. Despite a period of difficulty in 2020 when the company went into administration, it still has a high Trustpilot rating and various industry accreditations.

Everest’s generous warranties are a standout feature of this brand. Other window companies offer much shorter guarantees. You might even choose to pay an extra fee for the lifetime warranty, which can be transferred should you sell your house.

The price of Everest windows is high compared to other window companies in the UK, and its choice of finance options is limited. However, it’s a good choice if you have a considerable budget and flexible finance, as its quality is second to none.

Double glazing windows FAQs

Our methodology

To compile this Everest windows review objectively, we read professional and customer testimonials, technical documentation, brochures and forums. We then assessed the brand using a 100-point scoring system designed to evaluate the performance of window companies against the factors customers care about most.

These factors and their weightings 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 10 points;
  • The energy efficiency rating held by the company, for a total of two to five points;
  • The level of security offered, for a total of 10 points;
  • The warranty period, for a total of two to five points depending on its length;
  • The company’s years of experience, for seven to 10 points;
  • The number of payment options, for a total of 15 points;
  • The total rating score of the company held on Trustpilot, for a total of one to 10 points; and
  • Additional benefits (including FENSA certification, design options, customer support and the inclusion of trickle vents), for a total of 15 points.

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