Certass was established in 2006 and is now one of the largest and widely recognised bodies in the double glazing industry. Certass fully vet and assess all their members in order to ensure that when you have double glazing installed by a Certass member, all current building regulations are adhered to.

Any workmen which are a part of this competent person scheme must be fully trained and meet the strict criteria which is set by local authorities. When you choose a Certass registered installer, you can expect a very high standard of workmanship.

The Benefits of Using Certass

If you have your double glazing installed by a Certass member you will receive the following benefits:

  1. Deposit Protection
  2. A 10 Year Guarantee
  3. An offer of an insurance poilicy to cover the 10 Year Guarantee
  4. Registration of your new double glazing with the relevant Local Authority

This organisation is licensed by the Department for Communities and Local Government. All members are vetted to ensure they comply with these regulations.

An installation completed by a Certass member will be issued a certificate. This certificate proves compliance with all local Building Regulations.

One of the benefits of using a Certass accredited installer is that they take care of your window and door registration for you. They will register your new double glazing with your local authority, at no extra cost to you.


Quality Assured National Warranties is able to provide a broad spectrum of warranty and insurance based services to meet the needs of almost any tradesman operating in the domestic or commercial sectors.

Whether you require Insurance Backed Guarantees for self assessment purposes, Deposit Protection, or a Latent Defects Insurance for a large commercial building project, we can help.