Double Glazing Accreditation's

Upon looking for a double glazing company, it is important that you look out for the right signs. A reliable and trustworthy company should always have one or more of the top accreditation’s. Every double glazing company should devote time and effort into obtaining the perfect accreditation’s in the glazing industry, so they can be sure to offer you the best service and product.

When a company acquires these kind of accreditation’s, it means that they will be more reputable and recognised in the glazing industry. These top accreditation’s are known for their high standards and any company that obtains accreditation’s from the following can be seen as an honourable company.


Fensa logo

Fensa are a government encouraged company that was set up by the Glass and Glazing Federation and various other industry bodies which was in response to the Building Regulations put in place for all double glazing companies within the UK.

All homeowners that are replacing windows, must abide by the current building regulations in terms of thermal performance that are in place across England and Wales. It is also a homeowners responsibility to receive a certificate from a reputable company such as Fensa, so they can ensure all of the work has been done to a professional standard and in accordance to the current building regulations.

When having your windows replaced, if you are using a company that are members of Fensa, you can be sure to have one of the highest quality windows possible and as a homeowner, you can have peace of mind knowing that your double glazing windows will stand the test of time.

Why should I choose a Fensa registered double glazing establishment?

Fensa is one of the leading accreditation’s to have in the double glazing sector. Fensa doesn’t just provide you with high standards of double glazing windows but, they also provide their members with inspections to certify that the work has been done to their standards. All members of Fensa have to abide by their current building regulations and cannot work for them unless they adhere.

With Fensa, you will always have peace of mind that your windows have been installed to perfection as Fensa regularly have assessments for their current members in order to keep all services clean and compliant with regulations. If a member should fail to pass a Fensa assessment, the installer will lose their Fensa scheme and will therefor be reported.

These are just some of the many great reasons as to why Fensa is the perfect accreditation to look for when choosing a double glazing company. Because all members of Fensa must be checked out, you can be sure that if they are a member of Fensa, that have been thoroughly inspected before they are excepted and their work will be done to the highest standard possible.

What types of checks do Fensa do on an installer?

Fensa will always carry out certain checks before a company is even considered to become a member of their accreditation’s. Some of these checks are:

  • Firstly, the company will have a pre-approval inspection
  • While a pre-approval inspection is taking place, they check things such as, the installers capabilities
  • After a pre-approval has been completed, all of the company’s financials are checked out
  • A company is checked for consumer contacts and checked that the documents are clear with their terms and conditions

If you choose to have a Fensa accredited installer to carry out the service, Fensa will issue you with a certificate as proof that your windows are compliant to the current building regulations.  So working with someone who is a member of Fensa can be the perfect option for you to take.

Glass and Glazing Federation (GGF)

Glass and Glazing Federation (GGF) logo

The Glass and Glazing Federation (GGF) represent both commercial and domestic companies who fit, supply and manufacture glazing products throughout the UK and around the world. The GGF always aim to continuously withhold the high standards of the glazing industry, by protecting consumers when they buy any glazing product or service.

If you decide to use a double glazing company who is a member of the Glass and Glazing Federation (GGF), you will always get double glazing units that are second to none. Any company who is a member of the GGF will receive all of the latest advances, allowing them to provide you with the most current and up to date glazing products.

Why should you choose a company who is a member of the GGF?

Recognised by the Government

The GGF are a very recognised and significant accreditation for any company to be a member of. They play an important role within the industries regulations and standards, making them a company thoroughly recognised by the government.

Trade and Consumer Protection

The GGF also act like a guide for any trade or consumer by providing them with expert advice along with providing its members with exceptional direction. If you are worried about those traders that may rip you off, you can have peace of mind when GGF is involved as you will be covered by the conciliation service and also the customer deposit scheme which will protect you for your deposit and your installation.

Strict regulations and processes

If you decide to go for a double glazing company who is a member of the GGF, you will receive many benefits due to the GGF having strict regulations and specific processes for each of its members. There are many qualities that a company must have before becoming a member of the GGF and they also have to obtain a minimum of 3 years of working in the trade.


Certass logo

Certass is very alike to Fensa in regards to its ‘competent person scheme’. Certass was established in the year 2006 and has since been largely recognised and is a government approved CPS (Competent Person Scheme). Because of Certass’ strict regulations, all members are completely checked and have to be approved before becoming members, meaning they all abide by the correct and current building regulations and have the relevant qualifications.

Before a double glazing company can become a Certass member, they are thoroughly vetted for specific qualifications, relevant training and they must contain a high standard of work ethics. If you proceed with a Certass accredited, double glazing company, you will receive a certificate for the work that has been carried out. This certificate will provide you with proof that your double glazing windows have been fitted to the Building Regulation Compliance standards.

What are the benefits of choosing a member of Certass?

If you decide to go for a double glazing company that is a member of Certass, you will receive many benefits. Some of these benefits include:


  • Receiving a 10 year guarantee which covers all installation
  • You will receive protection for the deposit you gave
  • For the 10 year guarantee, you will receive an insurance policy to cover it.


Whatever double glazing company you decide to go with, you will always have peace of mind if they are a member of Fensa, the Glass and Glazing Federation or Certass. There are many other accreditations that a double glazing company can be a member of and you will receive most of these benefits but, these three are the three most recognised and reputable accreditations that a company can be a member of.


Complete Glazing Birmingham
Unit 130, 180 Sherlock Street
Birmingham, B5 7EH
0121 405 1058
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About Us

Complete Glazing Birmingham is a sister company of Mainstream Windows a local double glazing, orangery and conservatory installation company based in Birmingham servicing Solihull, Knowle, Sutton Coldfield, Bromsgrove, Leamington Spa, Warwick and Evesham.



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