From Past

to Passive


Hellenic Passive House Institute in collaboration with Greenpeace Greece and the Municipality of Moschato-Tavros, is going to improve people's quality of life by implementing the second Passivistas pilot project:
The Tavros project.

Main Concept
people's life


Passivistas: The Tavros Project

A standard social MFH, built in the 70s to accommodate immigrants with an area of approximately 750 m2, is about to be refurbished with regard to its energy efficiency in accordance with the Passive House Standard.

The objectives of the refurbishment are the minimization of heating and cooling demand provided by conventional means while achieving thermal comfort conditions and quality of internal air and the design of a building which will be not only self-sufficient by means of renewable energy systems but, given the surplus of energy generated, will provide the ability for electrical vehicles to be charged without further cost. In this way, the carbon footprint of the building and the residents is going to be virtually eliminated and the requirements for carbon neutral buildings which will be implemented from 2030 for all buildings are going to be met today.

Basic Question
am I cold at home?

This is the basic question that Passivistas and Physics will answer in this project. 

From an old refugee apartment building, to the home we all dream of – and are entitled to – have! Marios, Koula, Kostas, citizens like you who live in the uninsulated and unheated buildings, are currently freezing in the winters and suffering from the heat in the summers in their own home. Does this remind you of something? Are you experiencing the same?


Get involved and support our cause to improve this residence on "Tavros Project"
by companies and citizens


The project will be funded by companies, which will sponsor the building’s renovation with innovative materials and systems according to the study and by citizens through an international crowdfunding campaign. During the various construction phases of the refurbishment, the project will function as an educational, informative and social innovation support hub for every stakeholder by the realization of the following actions:

Technical Presentations

Technical presentations and live implementation provided by the companies who will sponsor the materials and corporate members of HPHI. These particular seminars will focus on the detailed design of the five basic principles of Passive House and the process from design to implementation.


Specialized workshops for technicians and construction companies who will be educated through non-formal education in a PH construction. The workshop will contain both theoretical and practical implementation on site. The technicians and the construction companies who will participate in specific tasks will obtain the Passive House Tradesperson Certification.

Visits by Students

Students’ days, which will be dedicated to students from different levels of education, and will have the goal to explain the concept of energy efficiency in buildings in a simple way. For University students the workshops will focus on technical aspects trying to minimize the gap between research/education and actual implementation.


Awareness days, which will be dedicated to users by providing all the information needed concerning the energy efficiency refurbishments of private properties. Members of HPHI and technical stakeholders involved to the project will reply to questions regarding energy efficiency in Buildings.

Create the most energy efficient building in Greece
The project “Passivistas: The Tavros Project” will operate for at least five years upon completion as a social "core" of collaborative actions.


The project contains a large technical background, but the goals are human-oriented. This the main reason we selected this particular building:

Energy Poverty
Policy Making
Continuous non-formal Education

A Passive House due to its extremely compact shell has a high inertia regarding heat flow in winter and summer. The building is designed to maintain a constant temperature of 20 to 25 degrees Celsius throughout the year, a relative humidity of 35-55% which is controlled by the ventilation system and finally the carbon dioxide concentration is always kept below 1000ppm

– Slide left or right-

before7 after6
On time
of the project


Nov 2021
Jun 2022
Jul 2022
Sep 2022
Dec 2022
Feb 2023
May 2023
Jun 2023
Jun-Aug 2023
Nov-Dec 2023
Feb-Mar 2024
Mar-Jun 2024
Jun 2024
Jul 2024
Aug 2024

Project’s Kickoff

Acquaintance meeting with the owner and agreement signing

Monitoring system

Installation of monitoring system for indoor conditions and 3D scanning by CERTH

Finalization study

Finalization of the energy modelling study by HPHI using innovative software

Visit in the building

Formalization of the collaboration with Greenpeace Greece and the Municipality of Moschato Tavros

First Stage

Start of the first stage of renovation in one apartment (Insulation, Windows replacing).


Kickoff of the official Campaign and the crowdfunding of the project

End of campaign

End of the campaign and the beginning of the renovation

Second Stage

Renovation of the whole building according to the Passive House Concept

On-site training

During the renovation phase HPHI will conduct site training for engineers, technicians and students

Mechanical Ventilation

Installation of the sponsored Mechanical Ventilation systems in the flats

Window Frames

Installation of the sponsored window frames in the flats


Installation of the exterior insulation

Solar panels

Installation of the sponsored solar panels on the roof of the building 


After the blowerdoor test and the final audit, the building will certified as Passive House EnerPHit

End of renovation

End of the renovation and the beginning of the monitoring under the new circumstances


logo transp EIPAK w



Greenpeace logo g



moscato tavros w

Municipality of Moschato-Tavros


Greenpeace logo g



moscato tavros w

Municipality of Moschato-Tavros