What it is

A geometric change diagram (διάγραμμα γεωμετρικών μεταβολών) is a survey plan that shows how one or more land parcels change in the Hellenic Cadastre: which boundaries are removed and which are created, which parts are cut off and where they are added, and the final area of each parcel. It is drawn up in GGRS87 (ΕΓΣΑ87), the national coordinate system of Greece, with coordinate tables and tables of changes, and it carries declarations by the engineer. Among other things, the engineer confirms that the change is technically feasible and can be entered in the Cadastre database.

When it is needed

Contracts that change the geometry: subdividing a land parcel, merging two or more, selling or exchanging a part, adjusting a boundary with a neighbour. For these deeds the law requires, instead of the extract of the cadastral diagram, a diagram that shows the change
Correcting boundaries or area: the application to correct geometric data is accompanied by a diagram showing the requested correction
Court cases: in lawsuits and applications to correct the Cadastre that change boundaries, the diagram must be attached, otherwise the filing is not admitted
Administrative acts: for example implementation acts or corrective acts that change land parcels

Planning check first

The fact that a diagram can be drawn does not mean the subdivision is allowed. The law restricts subdivisions, for example where the new properties would fall below the minimum plot size, with specific exceptions. So before we design a subdivision we check the minimum plot requirements for the original property and for the parts that will result, so that you are not left with a piece that cannot be built on or transferred. The legal side of the deed is covered by your notary and your lawyer.

How it is submitted

The diagram is submitted online, by the engineer who prepared it, to the digital receiver of the Hellenic Cadastre, with a digital signature. The submission produces a code and a proof of submission, which are cited in the deed. In a contract the proof is attached on pain of nullity, and in applications to the Cadastre it is a condition for the application to be admitted.

For contracts, the notary takes the code from the engineer, cites it in the deed, and the deed is registered at the Cadastral Office. For corrections, since 18 September 2026 applications to correct geometric data are filed on the Cadastre's metavoles platform: the owner files the application with Taxisnet credentials (the Greek tax-system login) and appoints the engineer, who registers the code of the diagram.

What we check before drawing it up

The property, surveyed in the field and tied to GGRS87
The Cadastre boundaries, from the digital files of the land parcels rather than from an image
The title deeds and earlier survey plans
Which neighbours or co-owners the change affects
The minimum plot size and building terms for the properties that will result

What you need / steps

The KAEK (the 12-digit cadastral code) of every land parcel that changes; you can also find it on the free Cadastre map
Your title deeds and any earlier survey plan
A rough sketch or description of what you want to do
A survey in the field and a proposal for the new layout, for approval by you and your notary or lawyer
Preparation, signature and online submission of the diagram, and hand-over of the code

Tell us what you want to change and send us the KAEK numbers. We will tell you whether the change is allowed and what it needs. See how we work with the Cadastre.

Geometric change diagram: subdivisions, mergers and boundary changes in the Cadastre