Z GROUP provides services that include Energy Studies, Energy Audits and Energy Performance Certificates (EPC) that aim at energy upgrade of buildings.

The term Energy Upgrade of Site or Building refers to interventions and changes that need to be made so that the minimum possible energy is consumed, while the optimal comfort conditions in the site will be maintained.

The best way to reduce energy consumption and minimize pollutants emissions is the implementation of the necessary energy interventions.

With the energy study of the site, its current energy situation is being recorded, the best technical energy interventions are being proposed and the energy behavior of the site, after the implementation of the proposed interventions, is being calculated.

Furthermore, Z GROUP performs a technical-economical, energy-saving analysis, which analyzes the cost effectiveness of the proposed interventions and carries out a detailed calculation of the pollutants emission reduction due to energy consumption.


Mr. Zarras Dimitrios is a Certified Energy Inspector (Registration Number 15100) and a Certified Energy Auditor (Registration Number 678).

Z GROUP is staffed by qualified engineers and accredited energy inspectors.

Z GROUP is certified to EN ISO 9001: 2008, ΕΝ ISO 14001:2015, OHSAS 18001:2007, ISO 22301:2012, EN ISO 27001:2013, ISO 50001:2011.