Crystal Windows and Doors double glazing review

Crystal Windows and Doors is one of the largest privately-owned double glazing window companies in the South East of England. It was founded in Essex in 1995, and has since carried out over 90,000 installations and expanded considerably, operating 3 showrooms in Hertfordshire, Essex and Epping.

Customers can choose between casement, sash windows, tilt and turn and bay windows. There are several colours available for double glazing, as well as decorative glass options.

All Crystal windows are backed by a standard 10-year guarantee, and the company is a member of the Glass and Glazing Federation’s (GGF) insurance-backed guarantee scheme, which provides protection and independent insurance for deposits and guarantees.

Crystal Windows and Doors installs uPVC double-glazed windows across the South East of England. Double glazing essentially consists of layering two panes of glass with a gas-filled space between them, reducing heat loss and noise.

Crystal offers a selection of casement, sliding sash, tilt and turn and bay window styles, some of which are Secured by Design accredited, a recognised standard for security products.

Crystal Windows and Doors specialises in uPVC windows, which is cheaper and much easier to maintain than timber frames. Timber is prone to warping or twisting, particularly in the harsh British climate, often causing the windows to stick or rattle.

Window frames come in several colours, and you can choose decorative glass for your window panes. All windows are backed by a standard 10-year guarantee.

• Guarantee options: 10-year standard warranty
• Price range: From £340 per window
• Energy efficiency rating: A+
• Secured by Design (SBD) rating: Yes, on some products

Pros and cons

While there is a lot to like about Crystal Windows and Doors, it’s always important to consider all the pros and cons before settling on a provider for your new windows.

Here are some advantages of choosing Crystal Windows and Doors:

• Reputation: Crystal Windows and Doors has a 4.7-star Trustpilot rating, making it an “Excellent” company by the platform’s standards. With 30 years of experience, it has a reputation for providing a great service to its customers.
• Fast quotes: Customers can request a quote online and will usually receive one within 24 hours.
• Manufactured in the UK: Crystal Windows and Doors manufactures its own frames in its Romford-based factory. This helps ensure the company’s products are high-quality.
• Energy efficiency: Crystal windows are A-rated for energy efficiency, helping you reduce your home’s energy use and carbon footprint.
• Finance available: Crystal Windows and Doors offers monthly financing options. You can even purchase your new windows without paying interest if you opt for the “buy now, pay later” scheme and settle your loan within 12 months.

There are some drawbacks to choosing Crystal Windows and Doors, including:

• Limited access: Crystal Windows and Doors only serves communities in the South East of England.
• uPVC only: The company only sells uPVC frames. If you want aluminium or timber options, you’ll need to look elsewhere.
• Warranty: Crystal Windows and Doors offers a 10-year warranty, while some competitors offer 20-year guarantees or even longer warranty periods.

Obtaining a quote from Crystal Windows is very easy. Prospective customers can fill an online form on the company’s website to receive a free quote within 24 hours, or call 0800 091 2136 to speak to an agent.

Once you agree to a quote, installation should happen within a couple of weeks, depending on the size of the project and your location.

How do Crystal Windows compare to other companies on the market?

Crystal Windows and Doors is one of the most popular double glazing companies in the South East, but if you live outside of the region, you may want to consider alternatives.

For those who live in Yorkshire, we’d recommend Coral Windows. Coral offers a friendly service and great after-sales support, several attractive glass and uPVC framing options, finance plans and warranties.

For those after a more premium product, including timber or aluminium frames, consider Everest. Unlike Crystal, Everest’s uPVC Exclusives range comes with 20-year standard guarantees and you can also purchase a lifetime guarantee for an additional fee.

The cost of your uPVC double-glazed windows will vary depending on the size of your windows, the complexity of the installation and the type of glass you select. While we can’t tell you exactly how much your new windows cost from Crystal Windows and Doors, we can give you an estimated price range based on online comparison sites.

Crystal Windows and Doors specialises in uPVC window frames. This type of frame requires very little maintenance. Unlike timber frames which need to be sanded down and repainted every few years, you can get away with a little elbow grease, soap and water to keep your uPVC frames in tip-top condition.

Don’t use abrasive or harsh chemical cleansers as these can degrade your frames. Additionally, you should prevent damage and discolouration by avoiding the use of paint or bleach.

Keep your glass panes clear using newspaper or a soft sponge or cloth and commercial glass-cleaning sprays.

“Good service. Fitters did an excellent job and kept things clean and tidy and were polite and helpful. Happy with the job carried out.”

• Colchester Customer, December 2025, via Trustpilot

“Original price quoted was over 3x the price of quoted given by anybody else. It was then dropped immediately by over £2000. Within 24 hours that price had been dropped again to over a third off the original price, but still double what others were quoting. Then received a letter with this “trade discount” price. Very intense communication. […]”

• KMCameron91, January 2026, via Trustpilot

Crystal Windows and Doors is an established double glazing company with a long history of providing a great service to customers in the South East of England. The praise the company receives in customer reviews is a testament to the professionalism and knowledge of its staff, from salespeople to installers.

For high quality uPVC windows that are manufactured in the UK, look no further than Crystal Windows.

The only downsides are that the company only operates in the South East of England, and Crystal’s selection is quite limited compared to other brands in terms of styles and colour options.

Methodology

Compiling an objective review is very important to us. We read hundreds of online customer reviews about Coral Windows, and reviewed technical documentation and brochures.

We then rated Coral based on the features and qualities customers care about most, including:

• The type of double glazing material (uPVC, wooden, aluminium);
• The number of styles on offer;
• The energy efficiency rating held by the company;
• The level of security offered;
• The warranty period;
• The company’s years of experience;
• The number of payment options;
• The total rating score of the company held on Trustpilot; and
• Additional benefits (including FENSA certification, design options, customer support and the inclusion of trickle vents).

Read more about how we review windows.