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FENSA is set up by the double glazing industry to help protect homeowners.

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What is FENSA?

  • Who can join/register?
    • Who can join/register?
      Registration is not confined to existing members of the Glass and Glazing Federation. All responsible companies of the replacement window industry are invited to join. Companies will have to meet entry criteria that include a commitment to comply with Building Regulations, evidence of competence, commitment to fair trading, and willingness to offer insurance-backed guarantees.

  • How do I join/register?
    • How do I join/register?
      Please click on "Why Join FENSA" from the menu on this page and fill in the Application Pack, The application pack includes the Rules of FENSA; a statement on charges; a list of approved bodies whose members are exempt from vetting by FENSA; and a statement of insurance requirements. Alternatively email: mhewett@fensa.org.uk or telephone 020 76453704

  • Who has made the decisions on FENSA Rules and operations?
    • Who has made the decisions on FENSA Rules and operations?
      FENSA is guided by a Board whose members include representatives from the industry (e.g. the board of the GGF, other trade organisations whose members are engaged in the installation of replacement windows, executive management of the FENSA scheme), government, local government, local authorities and consumer groups.

  • How much will it cost?
    • How much will it cost?
      The cost to join FENSA depends on when you join during the year as the registration period runs from January to December.

      Month of Application to FENSA
      Net Cost

      January -March


      £270 +VAT
      April-June

      £245 +VAT
      July- September

      £220+VAT
      October-December

      £195 +VAT
      Other Costs
      Net Cost

      Database transaction charges: Per Installation Notification Charges by Fax, Email or Web. (Note: If
       notifying by Fax, the cost to fax the call is charged at £1.00 per minute charged to the nearest second.)


      £1.50 +VAT
      Re-assessment of Pre-Approval

      £100 +VAT
      Pre -Completion installation Inspection

      £100 +VAT
      Post Completion Installation Inspection

      £100 +VAT
      Re-Inspection Charge

      £130 +VAT
      Transition Inspection

      £130 +VAT
      3 Yearly Review

      £130 +VAT
      Annual Renewal Charge

      £120 +VAT
      Installer/Homeowner Inspection Request

      £250+VAT
      Re-Instate Cancelled Direct Debit

      £50 +VAT
  • Who sets the charges for FENSA and where do the profits go?
    • Who sets the charges for FENSA and where do the profits go?
      FENSA obtains funds to supports its certification operations through a combination of membership fees and inspection fees. FENSA does not aim to accumulate or distribute any surpluses, but set its charges at levels appropriate to finance the continuing operation and expansion of its certification product, and to provide prudent reserves against contingencies.

  • When can I join/register?
    • When can I join/register?
      Now, just click on “why join FENSA” from the installer menu above, where you can download the Application Pack to join.

  • Do I have to be a Member of one of the trade associations or relevant bodies listed in the FENSA Application Pack in order to register with FENSA?
    • Do I have to be a Member of one of the trade associations or relevant bodies listed in the FENSA Application Pack in order to register with FENSA?
      No, you can register providing you are able to comply with all the requirements of the Rules and Application Form.

  • How do the inspections work?
    • How do the inspections work?
      FENSA Registered Businesses must undergo a pre-approval inspection at the start of their registration with FENSA. To ensure Building Regulations and thermal performance standards are consistently maintained, the installation work of every FENSA Registered Business is continually inspected by the UKAS accredited independent inspections body, the British Board of Agrément (BBA).

      Inspections will normally be carried out on 1% of each business's installations, subject to a minimum of 2 per annum and a maximum of 100. In the event of failed inspections, businesses will be responsible for the costs of re-inspection, and the frequency of inspections will increase.

  • What are the benefits?
    • What are the benefits?
      For companies, registration with FENSA confirms their commitment to complying to the Building Regulations. Click here to view the full range of benefits for installation companies.

      For customers, the FENSA scheme will provide a certificate confirming that their replacement window and doors comply with the regulations. Click here to view the full range of benefits for customers.

  • How will the Regulations affect installers?
    • How will the Regulations affect installers?
      They involve more stringent specifications for the products used and installed. In addition, all installations are subject to approval by Local Authority Building Control prior to undertaking an installation, unless arrangements for self-certification by registering with a Competent Persons Scheme such as FENSA have been made. With the annual rate of replacement installations running into the millions, the inspection of every installation would cause a major bottleneck if all were channelled through the Building Control route. When self-certifying, installation companies are vetted prior to their registration and throughout the year to ensure standards are consistently maintained.

  • Why must installers provide insurance?
    • Why must installers provide insurance?
      For all replacement window and door installations that are notifiable to FENSA (click here to find out which types of installations fall under FENSA's remit), FENSA Registered Businesses are required to have in place for their customers the two categories of insurance stated below. It is a government requirement that companies must have these insurances in place.

      Deposit Protection: If Registered Businesses take deposits in advance of installations, they must give some form of deposit indemnity. Deposits may be guaranteed by, for example, trade association Deposit Indemnity schemes, or credit card protection.

      Insurance-Backed Guarantee (IBG): A Registered Business must also give a guarantee or warranty covering the cost of completing rectification work in respect of defects and in the event of ceasing to trade, offer to back this guarantee with an independent insurance policy. This is called an Insurance-Backed Guarantee (IBG).

      Insurance Providers: Deposit Protection and IBGs can be provided by a range of insurance providers.

  • My customer has a complaint against me
    • My customer has a complaint against me
      We are sorry to hear that your customer has a complaint against you. FENSA can only deal with consumer complaints regarding non compliance with the Building Regulations.

      You may find it helpful to understand the advice that we issue to consumers with a complaint by clicking here Where necessary FENSA will arrange an independent inspection on the installation work that is being investigated as a complaint. If FENSA considers that the Building Regulations have been breached and are non compliant, FENSA will issue a variations report with corrections to be made on the installation which the installer is obliged to undertake.

      We advise consumers that any other complaints should be referred to your local Trading Standards office, any Trade Association that the Company may belong to or The Glazing Ombudsman, providing that they are members. However all complaints must first be notified to the company and the company's own complaints procedure must be exhausted before the complaint is referred on.

      If you have a complaint about the FENSA scheme please tel 020 7645 3700 or email:enquiries@fensa.org.uk