What is FENSA? (Doors & Windows)

What is fensa?

FENSA is an acronym for Fenestration Self-Assessment scheme. The Glass and Glazing Federation, with the consent of government agencies, founded it.

They are responsible for ensuring that all small-scale to large companies comply with the regulations set by the government when installing components such as double glazing installers. 

They issue a certificate which is regularly updated and checked by government officials. If an individual fails to meet the regulations, they will most likely lose their FENSA accreditation

Why is FENSA important? 

When choosing a brand for installing a conservatory in your house, carrying a thorough background check is highly recommended. Having a FENSA certificate adds to the reputation and reliability of the brand. 

FENSA also conducts regular inspections of construction businesses and double glazing installers to ensure that they follow the organization’s standards.

FENSA aims to improve window and door replacement agencies (see also ‘Can You Replace A Door Without Replacing The Frame? All You Need To Know‘). Owners may turn to it for guidance and protection against contractors who commit fraud or make mistakes while working on their property.

Thus, as a house owner, you must ensure that the company you go with is FENSA accredited before they start to carry out any double glazing repairs. Consider getting a double glazing quotation and installation from a different firm if the first one isn’t FENSA accredited.

Competent Person Scheme

This scheme is a type of regulatory self-governance which works with various government-approved bodies. These organisations are only approved after passing a rigorous screening process. 

Companies who meet the regulations are supplied with self-certification and self-assessment once they register themselves on the board. The Competent Person Scheme was primarily put together in April 2002 to look over the installation of double glazing fixtures. 

Aside from FENSA, six more organisations were created for this purpose, FENSA being the most reputable. These organisations keep tabs on their members and on agencies, so your certificate will automatically be updated from time to time if you are in compliance with all the regulations. 

Thanks to their self-governance process, owners who carry out the construction with the help of FENSA Approved Installers do not have to worry about paperwork and certificates for their new double glazing. 


  • As stated above, FENSA is the most popular of the six government-backed plans in existence. In terms of authorized double glazing providers, it boasts the widest range of options. 
  • It is one of the most well-known and respected brands in the fenestration sector because of its brand value, high quality-standards, and the highly sought-after certification it offers. 
  • With FENSA’s focus on windows and doors, the company’s services are always in demand and enduringly popular among homeowners. 
  • As a way to guarantee that customers get the best service, all Approved Installers undergo regular inspections and reassessments.

Benefits of FENSA certification for home owners 

Given below are some of the many benefits that you can reap from having a FENSA accreditation : 

  1. By working with FENSA certified constructors, you will be able to save both time and money. Professional installers usually recommend a system which is highly energy efficient and doesn’t burn a hole in your pocket. You will save be able to significantly cut down on heating costs in the long run. 
  2. Professionally trained agencies and installers will make sure that all the work is done in conformity and adheres to the building codes and energy requirements. 

FENSA-compliant fitters are a vital investment for homes, simply because of the simplicity with which they can execute the job along with the unmatched precision. 

What does a FENSA certificate cover? 

This organisation has the authority to look over the replacement of roof windows, doors, roof lights and windows. The replacement must be carried out on the original footprint of the property with the size of the rooms unaltered. 

On the flip side, here are the structures which aren’t covered by FENSA : 

  • Extensions or conversions of any sort 
  • Orangeries 
  • Conservatories 
  • Flat-to-houses 
  • Commercial premises 
  • External porches 
  • Sheds 
  • Caravans 
  • Mobile homes 

Since 1st April 2002, FENSA certificates have only been issued for replacement windows and doors. A FENSA certificate is not necessary if a contract was signed before April 1, 2002. This certificate is only needed if your contract was completed after 30th June 2002. 

Also note that you need to keep this certificate safe with you if you plan on selling your house in the future. Most potential buyers ask for this certificate and getting a new one issued will cost you around £25. 

With that said, we hope all of your doubts were cleared after reading this article. Thanks for keeping up!


Matt James

Matt James

Hi, Matt here! I started out almost 20 years ago as a teenager working in the family business fitting doors, windows and conservatories. I now run this website to share the best tips and advice for anyone looking to get a good deal on double glazing.

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