Green Deal Assessor Organisation Certification (GDAO)

Become a Green Deal company

Green Deal Assessor Organisations are the guardians of the Green Deal scheme. We offer Green Deal schemes across the assessor and installer spectrum providing experience and expertise. Register as a GDAO with Stroma Certification and help us ensure the compliant delivery of high-quality Green Deal advice.

Our Green Deal Advice Organisation (GDAO) Certification scheme is approved by DBEIS and accredited by UKAS in line with ISO 17065:2012.

Competitive membership fees.

Fulfill all legal & compliance requirements. We’ll support you in your work to make the industry better. Secure the backing of an industry approved Green Deal certification body.

Initial scheme application assessment
Initial office assessment
Annual Surveillance assessment
Witnessed assessment
Extension to scope

All quoted prices exclude VAT. *Fees payable are dependent on advisor numbers and location, for further details please view the witnessed assessment complete pricing matrix. View the complete pricing matrix.

Application and scheme support.

Our Green Deal team can guide you through the application process. The QMS is a requirement for organisations who register as a GDAO. It is outlined in the Specification for Organisations Providing Green Deal Advice Services. We'll also give you options on 'per click' insurance to increase consumer confidence and protect your customers and advisors.

The minimum levels of personal insurance cover required by our GDAO certification scheme are:

Domestic Buildings

  • Professional Indemnity Cover £100,000
  • Public Liability Cover £1,000,000


  • Professional Indemnity Cover £250,000
  • Public Liability Cover £1,000,000

Stroma Certification provides 'per-click' insurance, whereby there is a charge for each lodgement made. You can enquire by emailing

Certification Scheme Information

Stroma Certification's Installer & GDAO Certification scheme documents are made available to the public, applicants and certified Organisations through a downloadable members pack that contains documents including the following:

  • Installer Application Form
    • To be completed for those Organisations requiring certification or alternatively the online application can be completed.
  • Scheme Handbook
    • Documents the certification scheme processes for granting, refusing, maintaining, renewing, suspending, restoring or withdrawing certification or expanding or reducing the scope of certification.
  • Impartiality Policy
    • Documents Stroma Certification's commitment to ensuring impartiality in all aspects of our certification and business activities. Further information is also available on the Consumer Advice page.
  • Complaints & Appeals Policy
    • Documents how a complaint or appeal can be notified to Stroma Certification and how it will be dealt with. Further information is also available on the Consumer Advice page.
  • Support Policy
    • Documents the means by which Stroma Certification can be contacted concerning Installer & GDAO certification and other business related activities.
  • ID Photograph Requirements
    • Documents the format and structure needed for photos to be used to produce the applicable certification ID card.
  • Privacy Policy
    • Documents Stroma’s commitment and procedures for ensuring that the personal data collected and used in our certification and business activities is in accordance with the General Data Protection Regulation (GDPR) requirements. Further information is also available on the Data Protection page.

If you are unclear on any aspect of the certification process please contact Stroma Certification by emailing or telephone 01977 665 420.

What constitutes a compliant QMS?

Stroma Certification will only certify a GDAO once an appropriate QMS has been evidenced. Your QMS should cover the following in line with the 005 Specification for Organisations providing the Green Deal Advice Service:

Policies and procedures for:

  • Selection and work assignment
  • Continuing Professional Development (CPD)
  • Sub-contracting Green Deal advice work
  • Green Deal Advisor control: documents, record keeping and information management
  • Internal auditing and corrective actions
  • Interaction with customers
  • Claims of conformity
  • Complaints management
  • Disciplinary and appeals procedure

Operational procedures for:

  • Preparation for the Green Deal assessment
  • Providing and exchanging information with customers prior to Green Deal assessment visits
  • Applying RdSAP or full SAP methodology
  • Checking EPC validity and suitability for the Green Deal assessment
  • The Green Deal assessment and information gathering
  • Providing initial feedback to the customer during the assessment visit
  • Post Green Deal assessment visits
  • Lodgement of GDARs in England, Wales and Scotland
  • Production of the new EPC following installation of Green Deal measures

How do we audit the work of a GDAO?

Ongoing surveillance, auditing and maintenance are conducted to confirm ongoing scheme compliance. Stroma Certification will review 5% of the GDAO's internal audit records, 2% of all domestic Green Deal Advisory Reports lodged over a 12-month period and 1 Green Deal Advice Report per Green Deal Advisor per quarter.

There’s more to our GDAO membership.

Our simple online application is just the beginning. Unlock a feast of membership benefits, including free technical support from our Green Deal team, with GDAO membership.

Become a Stroma GDAO. Apply online.

Green Deal Advisors are reliant upon certified Green Deal Assessor Organisations to practice within the industry. You could become that GDAO by applying to Stroma Certification.

apply now

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