Digital attestation of engagement agreements for technical works: what it is, when it’s required & how to do it

The “digital attestation of engagement agreements for technical works” is the electronic filing of an agreement between the awarding party and the contractor/subcontractor for technical works above a value threshold (indicatively > €6,000). The process is carried out via myAADE, before the commencement of works, and issues a protocol number/digital receipt that accompanies the project.

In this guide you’ll see why it was introduced, when it is mandatory, who submits it, the practical steps, a preparation checklist, common mistakes that cost time and money, real-world scenarios, and a practical FAQ.

Why it was introduced & what changes

For years, engagement agreements for technical works were filed with inconsistent practices and an unreliable audit trail. The digital attestation unifies the procedure: everything is declared in a central, transparent system with traceability, clear responsibilities, and a protocol code that certifies the submission.

For engineering firms and civil engineers, this means better documentation for third parties (e.g., banks, public authorities), more immediate project organization, and simpler linkage with other steps (permits, inspections, the Electronic Building Identity). For awarding parties, the mandatory timing of the declaration before project start reduces misunderstandings and disputes.

In addition, access for both counterparties through their own credentials adds control and security: the contractor/subcontractor can view the relevant declaration and request a correction/rejection when details are not accurate. Thus, both sides operate with a shared, transparent point of reference.

Finally, digital submission connects with further automations (reports, amendments, linking multiple declarations), reducing time and effort in recurring actions.

When the digital attestation is mandatory

Before moving to the steps, it’s worth clarifying when it’s needed. This section summarizes the key scenarios so you know in advance whether you must proceed with electronic filing.

Technical works above €6,000: The notification of the agreement details is made by the awarding party (or an authorized person) before the commencement of works, via the “Engagement agreements for technical works” application in myAADE.
Works up to €6,000: Not included in the above application. They are filed electronically in the “Register of Agreements” (para. 16, article 8, Law 1882/1990), with a deadline up to the 20th day of the months of January, April, July, and October every year.
Uncertainty about the final price: If the value hasn’t been determined yet but is estimated to exceed €6,000, you submit the declaration as normal (selecting “undetermined value”) and, when the amount is set, you submit a subsequent declaration linking it to the previous one.

Who submits it & what is the timeline

The submission is made by the awarding party (natural or legal person) or by an authorized representative/accountant. Login is done with myAADE credentials and the declaration must precede the start of works. The contractor/subcontractor is notified in their own environment and may request a correction/rejection within the prescribed timeframe.

Step-by-step: how to obtain the digital attestation on myAADE

Below are the summarized steps followed by the awarding party or the authorized representative inside the application, without unnecessary delays.

Log in to myAADE and enter the service “Engagement agreements for technical works”.
New declaration: Fill in the project description (with address), start date, project value (or “undetermined”), and counterparty details (Greek TIN or foreign entity/person details).
Attach the agreement (optional): Upload a PDF (e.g., up to 2 files, within the total size limit).
Link to a previous submission: If this is an amendment/addendum, provide the protocol number of the original.
Final submission: Receive the protocol number/digital receipt. The contractor/subcontractor sees the relevant record in their profile.

See the detailed application steps in the PDF document “Instructions for using the application ‘Engagement agreements for technical works by contractor/subcontractor (Article 19 of Law 820/1978)’”

What you need before you start

Proper preparation reduces errors and completion time. Gather the following before entering the system.

Project details: Description, exact address, planned start date.
Price/value: Agreed amount or “undetermined value” (when expected to exceed the threshold).
Counterparty: Greek TIN (for data retrieval) or full details for a foreign natural/legal person.
Agreement in PDF (optional): Keep file sizes reasonable.
Protocol number of a previous submission: If this is an amendment/addendum.

Common mistakes that cost (and how to avoid them)

Most errors stem from haste or incomplete information. With the checks below, you can prevent them.

Wrong counterparty TIN: Double-check carefully; without a valid TIN, data retrieval is not possible.
Oversized PDFs: Compress or split documents so they do not exceed the limits.
Incorrect start date: Remember the declaration must precede the commencement of works.
Not linking to an earlier record: For amendments, always state the previous protocol number.

Examples of real-world scenarios

Real scenarios help you see the flow in practice and avoid missteps.

Structural strengthening of an apartment building (e.g., €30,000): The building manager, as the awarding party, submits the declaration in myAADE before crews start. The contractor sees the agreement under “Project engagements” and tacitly accepts it (does not reject it within the set period).
Home renovation (estimated €7,000, price not yet fixed): The awarding party declares “undetermined value”. After the cost is finalized, they file a second declaration linking it to the first.
Small job (€4,800): The Article 19 application is not used. Filing is done in the “Register of Agreements” with the corresponding quarterly deadline.

Frequently Asked Questions (FAQ)

Do I have to upload the agreement as a PDF?

No—attachment is optional. Nevertheless, uploading the document improves documentation and speeds up checks. If you choose to upload it, the system accepts up to 2 PDFs, totaling 16MB.

Who files the submission—the contractor or the owner?

The awarding party (or an authorized representative/accountant) files it before project start. The contractor/subcontractor sees the declaration in their profile and can request a correction/rejection within the set timeframe.

What if I don’t yet know the final value?

Make an initial submission with “undetermined value” (when it is estimated to exceed the threshold). Once it is finalized, proceed with a new submission and link it to the original.

Is there an obligation for small projects?

Yes, but usually via the “Register of Agreements” and not the application for higher-value works. Deadlines are periodic (quarterly), with a due date on the 20th day of January/April/July/October.

Since when is submission exclusively electronic in the new application?

The process via myAADE applies under the 2024–2025 decisions (A.1152/2024, A.1058/2025, etc.), with an explicit requirement for electronic submission before the start for works > €6,000.

We handle the process for you

The Katsouris Engineering team promptly handles agreement drafting, the electronic filing in myAADE, any amendments, and full documentation for third parties. Get in touch for immediate filing and a proper project start in Athens and across Greece.