The Passive House standard

The Passive House standard is the world’s highest and fastest growing energy efficiency standard that achieves a reduction in energy consumption up to 90%. There are now more than 30,000 passive buildings around the world, many of which have been built since 2000. Passive house is a super-isolated, almost hermetic building. The heating is done by the passive accumulation of energy from the sun, the electrical equipment and also by the energy of the people living in it. The remaining heat is provided by an extremely small heat source. Passive building thermostats are limited to a minimum to reduce heat loss.

Avoiding heat overheating through the orientation of the house and high-quality triple-glazed windows, help to reduce the need for additional cooling, which is often unnecessary. The passive house has a recovery system with a recuperator for energy utilization and recovery, balanced and constant supply of fresh air. The result is an impressive overall system that not only saves up to 90% of heating costs but also provides superb air quality.

Characteristics that are mandatory for the Passive House standard:

  • Annual energy demand for heating and ventilation ≤ 15 kWh / sq.m / per year
  • Annual consumption for all needs of the building ≤ 120 kWh / sq. m / per year
  • Building air impermeability ≤ 0.6 ACH @ 50 pascal load measured in a Blower-door test.  

Additional Climate Requirements:

  • Windows with U – values ​​- ≤ 0.8 W / m2 / K
  • Ventilation system with energy utilization and efficiency ≤ 75% and with low electrical consumption of 0.45 Wh / cubic meter
  • Construction without thermal bridges ≤ 0.01 W / mK                                                                                             
  • Picture rights by PHI


MARITZA newspaper: Demonstrative center in Markovo teaches us how to build passive houses

The project and certification of a demonstration center, which will teach us how to build a passive house, has begun just a few kilometers

from Plovdiv, in the village of Markovo. The ambitious project is for construction engineers from Munich and Plovdiv, who have been trying for several years to push the passive house model to our latitudes. The construction began after the Passive House Institute Darmstadt certified the projects, says initiator Eng. Nikolay Stavrev. At present, Dr. Arch. Iva Stoyanova – the leading designer of the project – finishes the last touches of the building.
The name of the project is “Oberon 2”, which has already been realized and will operate as a center of Oberon Konzeptbau office. The center itself is a single-family house of 230 square meters, plus an office area where you can follow the building process and examine the accompanying documents to get a complete idea of ​​the Passive Hou

se standard. The idea is to monitor the process and to promote concepts, processes and tendencies, and last but not least, to get prepared for the directives accepted in the European Union which will impose as obligatory conditions for new construction after 2019, specified engineer N. Stavrev. Passive house is difficult to be placed as a concept in our market, but it is often used building practice in European countries. After 2020, Berlin will shut down 18 nuclear power plants, and measures are already being taken to tackle the shortage of electricity that will come out afterwards, says Eng. Stavrev. He also adds that permissions for the construction of buildings covering the parameters of Passive House Institute Darmstadt are issued in 2013 in Frankfurt region and this is already common practice in many municipalities and regions of Germany. Such rules are expected to become obligatory in our market as our country is an EU member!

The way to the PH.D in 8 years!

May 2007 – English Language School in Plovdiv October

2007 Munich – TUM

January 2012 Austin, TX USA: Institute for Computational Engineering and Sciences (ICES), University of Texas at Austin

September 2013 Barcelona, ​​Spain: Laboratories of Numèric Heights, Politecnica De Catalunya University

 May 2015 Minneapolis, MN USA: Department of Civil, Environmental and Geological Engineering, University of Minnesota

 18 May 2016 – Aachen

The future in your home – the Passive House standard in Bulgaria


You’ll probably think that this is impossible. But on the contrary – it is quite possible. You can live in a beautiful, peaceful, extremely comfortable home. And at the same time according to the highest requirements for a healthy life and the lowest energy consumption, which until recently, was only a privilege for citizens from central and northern Europe.

“Oberon 2” can provide you with minimal additional construction costs. And you can see what this is all about – the unique home in the village of Markovo, near Plovdiv, situated in a beautiful nature, in a harmonious, quiet environment. This is the certified OBERON 2 Passive Building project.

You can read the entire article here:



Underground garage for sale

Underground garage for sale on 99 San Stefano Str. – absolutely secure, access with a modern car lift, suitable for a warehouse with a net area of ​​27,42 m2 and a garage door Hörmman.

By owner – no intermediary, tel: 0885 490 177. If requested – demonstration with parking of ML, X5

Passive House – Guarantee for Absolute Comfort of Living and Low Cost of Energy

“Oberon Konzeptbau” – the only company with German certificate Passiv Haus Standart Pluss for performance Despite their popularity in Europe, passive buildings still suffer negative thinking and confession in Bulgaria due to lack of awareness in society. Passive House is a world-famous and long-recognized German standard for modern, low-energy and eco-friendly construction. This standard is not the only one in the world for design and certified buildings but is widely applicable in countries like Germany and Austria known for their strategic attitude to home investment, comfort of habitation and nature.

The Passive House standard has long been introduced by many foreign municipalities as obligatory for all new buildings. More than 30,000 passive houses have already been built around the world, and many of them are built after 2000. Although, if we have to be correct, different sources declare different numbers.

You can read the entire article here.

Oberon Konzeptbau participated in the “Passive House Open Days 2017” with its second Passive House

On the weekend of 10. and 11. November, Oberon Konzeptbau participated in the “Passive House Open Days 2017” with its second Passive House project “Oberon 2”. We showed the construction site to the interested participants and elaborated on benefits and best practices for the Passive House standard in Bulgaria. We shared our experience, which we have gathered in our work in the past 3 years. Furthermore, special attention was dedicated to our participation in the EU project “Affordable Zero-Energy Buildings A-ZEB”, where we join forces with consortium of 8 companies and organizations in the construction sector to derive a common methodology for cost reduction in energy efficient projects. We presented the current progress, discussed the barriers for faster growth of this sector and outlined the next steps for the project.”



Seminar – EFFICIENT AND ECONOMIC USE OF ENERGY IN INDUSTRY AND IN LIFE, organized by “The Territorial Organization of Scientific and Technical Unions with the House of Science and Technology – Plovdiv” – 9th November 2017




In search of informed parthers

Dear Friends, OBERON Konzeptbau has already had two years of experience in implementing nearly zero-energy buildings, following the toughest global standards for energy efficiency. Recently we also presented our project in Plovdiv on the regular international Open Door days for buildings executed under the German Passiv Haus standard. In addition, we participate in an international consortium and implement a European project to develop a methodology to reduce the cost of such projects. Having the desire to promote nearly zero-energy buildings in Bulgaria, we organize a quiz with 10 questions and every correct answer will give the author a 1% discount on a desired quatation for designing and executing a near zero-energy building. We have to clarify that all our friends and potential investors in Bulgaria are invited to participate.

1. Why the building is filled with concrete exterior walls?

You have a concrete center

You have a reinforced yard

There is no supply of ceramic bricks in Plovdiv

The thoughts of the air impermeability test

There is a lack of builders in Plovdiv

You are looking for a lower price for the “rough” construction


2. Why the quality of all concrete elements is “sight concrete”?

Our designer can offer a small part of the building to be left without plaster, plaster, latex … and consequently reduce the price

Because there are no qualified plasterers in Plovdiv

Because you have qualified formwork and quality formwork

You want to be different from others



Work on the A-ZEB research project in progress 1

March 2018

Our work on the A-ZEB research project aiming to find ways for a cheaper construction of nearly zero-energy buildings is in progress.


Representatives of 8 organizations from 6 European countries exchange experience and seek ways through best practices and personal research, to develop an integrated methodology for cost effective reduction of such projects. In February 2018, the first part of the project was completed, especially the conditions of construction of nearly zero-energy buildings in these six countries.


During the next weeks, we will present the results of this phase, and today we are focusing on the integration of technical solutions for cooling and warming of the buildings.

More than 15 different systems with all modern technologies have been studied and described.

For more information, please send an inquiry to our e-mail address: