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Choosing the best Double glazing company

Choosing the best UPVC double glazing specialist for your new windows, doors, orangery or conservatory can be hard.

Here’s our top tips for choosing the best double glazing specialist:


Most importantly, review and select your double glazing company carefully – always ask for customer testimonials and references.

Check accreditations

Choose a FENSA double glazing registered company.  FENSA is the industry standard for replacement window and door installers self-certifying compliance with the building regulations.  FENSA is the brand trusted by all local authorities, industry and government – homeowners can to.  FENSA proactively protects consumers from the cowboys.

It is important that you ask every company to back up verbal claims with documentary evidence that they have the required certification.

Quality and performance - choose branded products

Some double glazing companies cut corners in areas you can’t see, like with the sealant used around the window frame.  Low quality materials can quickly start to fail, resulting in costly repairs and maintenance.  Make sure the window and door company you choose provides top quality work, and uses a UPVC leading window supplier.


Most installation companies will offer a guarantee.  The industry standard is based on 10 years. 

Windows doors conservatories security

Check that the glazing company offer double glazed windows and doors designed to include a variety of security features to protect your family and home against criminal intrusion.   With inadequate security measures, a burglar will gain entry to your home in a flash, without being spotted by neighbours in the street. 

Building a conservatory or orangery?

Unfortunately, regulations as they currently stand do not require most conservatories and orangeries to have planning approval or local authority building control. You’ll find that many conservatory builders cut corners – bad news for homeowners.  Choose a reputable conservatory builder that you can trust. 

Choose a company with experienced representatives and a showroom

Get the right advice from an experienced adviser.  Always ask for a written quotation so that you have a record of the scope and specification of the works included in the quotation.  Be suspicious of very low prices and equally suspicious of very high prices.  If you are comparing different double glazing companies, make sure they are offering like for like in terms of product quality.  Ask to see the products, preferably in a showroom where you can compare each design.

Cost against value

Make sure that your getting value for money.  Smaller UPVC window and door companies have less overhead than larger companies and are able to offer a quality service without the high price tag that goes alongside big brand TV and digital advertising campaigns.

Find a local double glazing installation company

Find recommended double glazing companies in your area.  You are more likely to get a better service from an established local company. 

Choose Carera Windows - the recommended company

Carera Windows has become one of the leading double glazing specialist companies. We’ve achieved this through adhering to our ethos of:

  • Offering expert advice
  • Value for money
  • Quality products from well-recognised brands
  • The very latest in energy efficiency
  • High security branded products
  • Excellent customer service

We’ve never wavered from that commitment and continue to grow from strength to strength. More than half a million windows and doors already have been successfully installed; thousands of customers full of praise for jobs well done.

We have an enviable reputation, all thanks to our customers and their kind recommendations.  A whopping 70% of all our home and commercial enquiries come via personal testimonials from happy customers.  To read our testimonials click here.

Carera Windows specialise in high quality replacement windows, doors, conservatories, orangeries, porches and other home improvements.

Our service in a nutshell

  • Free quotation
  • Free site survey services
  • No deposit
  • Payment upon successful completion of the installation
  • Employ our own expert sales people and installers
  • All products are manufactured to the highest of standards
  • All products are thoroughly tested to ensure compliance to all industry standards
  • Energy efficient rated windows, doors and skylights
  • 10-year guarantee
  • FENSA registered double glazing company

Big brands

At Carera Windows, we use approved and well-recognised brands including:

Swish - British made

We use trusted and recognised Swish branded profiles, British made, of superior quality.  Every frame is bespoke, made to your exact requirements and comes complete with all the relevant CE marking documentation.

Swish, the best UPVC windows and doors, supplied in a variety of colours and finishes and come in a broad range of styles from casement windows, tilt ‘n’ turn windows to sash windows and more.

More details are available on the Swish website

Yale - for increased security

All of our UPVC windows and doors come with Yale security locking systems as standard, protecting your property from intruders.

Glazing – Pilkington KS Glass for the ultimate in energy efficient glazing

We use Pilkington KS, argon filled units as standard.  For over two decades Pilkington K Glass has been known as the UK’s energy efficient glass.  Good news, now with the recent launch of Pilkington K Glass S the range offers more choice than ever.  Pilkington K Glass S is a high performance low-emissivity soft coated product which offers excellent thermal insulation when incorporated within an insulating glass unit.  Pilkington K Glass S has a highly neutral appearance with optimal solar heat gain, thermal insulation and light transmission to provide the highest Window Energy Rating (WER) performance.  Our experts will help you to make an informed decision on the type of glass to best suit your needs.

Building a conservatory or orangery the Carera way

At Carera we give you the complete package. We design, supply and install high-quality frames, roofs and doors, also taking care of electrics and lighting. You’ll delight in a conservatory that absolutely meets your every preference and need.  However large or small your conservatory or orangery project, we are happy to provide you with a complete package.

 A good conservatory starts with building a good foundation.  A substandard foundation will invariably cause problems after construction. Carera Windows stick meticulously to first principles of conservatory installation. We always take conservatory foundations to the recommended depth - our conservatories are built to last.  

Experience and attention to detail is what makes Carera stand out. We control every aspect of a project ourselves. We never walk away from a problem. And the words ‘hard sell’ are not, and never have been, in our vocabulary. We work with you from start to finish, from planning to installation and final inspection. We listen closely to everything you say. Nothing gets overlooked. Our experience is your assurance of a perfect solution, every time.

We are here to help, call us now on 0808 100 5007. 

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