TGAS is managed independently by CEDR, an Alternative Dispute Resolution Provider, to resolve disputes related to 'traders', who are member companies of the Glass & Glazing Federation ("GGF") or registered firms of the Fenestration Self-Assessment Scheme ("FENSA") and their customers.




Up to 90 days

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What we can do

Prior to the institution of arbitration proceedings the Parties must attempt to settle the dispute through GGF’s conciliation procedure (if a GGF member company) or through FENSA’s complaint process (if a FENSA registered firm) for at least 40 working days. If the conciliation procedure fails to resolve the dispute the Parties may proceed to arbitration.

  • If you want to know more about how we can help you with your TGAS complaint, please visit our Help & Guides.

The steps you must take before submitting a complaint

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Contact the company

Raise your complaint with the company in the first instance.
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Contact Glass & Glazing Federation or FENSA

If the company is not able to address your complaint to your satisfaction you can escalate the matter to the Glass & Glazing Federation or FENSA as appropriate. For GGF, please email and for FENSA, please email
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Apply to TGAS for arbitration

If intervention from GGF or FENSA does not resolve the issue you may apply to TGAS, however, to commence arbitration proceedings, a joint application by the Parties must first be submitted to CEDR through the GGF where the trader is a GGF member company, or through FENSA where the trader is a FENSA registered firm.
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Are you a business?

CEDR can provide dispute resolution services for businesses in most sectors.

  • Fast, and cost effective solutions
  • Provided at a sustainable cost
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