For Further Information
0345 053 8975


Prospective members are rigorously vetted before being allowed to join our national network of accredited installers. The implementation of a 12-point vetting procedure means that a number of glazing companies who apply to join DGCOS do not satisfy our accreditation requirements. DGCOS also carries out frequent audits and monitors level of customer satisfaction.


  • Undergo a five point credit and background history check on the proprietors/directors which includes multiple phoenix checks, credit scores, CCJ checks and similar trading name checks.

  • Provide DGCOS with a minimum of 10 customer references (of installations carried out within last 12 months) who will be independently approached for quality assurance purposes

  • Provide DGCOS with a minimum of 3 supplier references who can be independently approached for quality assurance purposes.

  • Provide DGCOS with a copy of their current Health and Safety Policy.

  • Carry minimum insurances of a) £2m Public Liability b) £10m Employers Liability.

  • Provide every customer with a Written Contract (to include Terms and Conditions).

  • Provide every customer with a Written Guarantee.

  • Provide every customer with Deposit Protection Insurance (where a deposit has been taken - up to a maximum of 25% of the contract value).

  • Provide every customer with an Insurance Backed Guarantee.

  • Comply with building control regulations on every installation deemed necessary.

  • Allow DGCOS Inspectors to inspect any installation deemed necessary.

  • Allow DGCOS to send every customer a Satisfaction Questionnaire.

  • Submit to the legal jurisdiction of DGCOS and the Ombudsman.


  • Every customer is automatically sent a Satisfaction Questionnaire and pre-paid envelope.

  • These replies are entered into the DGCOS performance system and results monitored.

  • Minimum standards set in each category and alerts set off when ratings fall below minimum standards.

  • These scores will be available to view by the installer and comparisons of performance with whole membership.

  • System automatically picks up low scores and identifies relevant salespeople and failing fitting teams etc.

  • Annual review of credit checks and public/employer liability insurances.


I believe the benefits DGCOS offers consumers are head and shoulders above anything else on the market.

Tom Scanlan - P & P Glass
Your internet browser is not supported with this website. Download a free, up-to-date browser here. ×