121_Simple House


Two detached houses, each with a granny flat, designed according to the concept of the "living machine". Clear lines and simplicity take centre stage, without any superfluous frills.


Construction is based on the principle of simplicity, with compact floor plans that follow the tiny house principle and offer versatile utilisation options. The surfaces are deliberately left without elaborate and expensive coatings in order to focus on functionality and sustainability. Wherever possible, reusable building materials are to be used in order to pursue an environmentally friendly approach.




Thanks to the CO₂-binding timber construction method, the new building actively contributes to the reduction of CO₂ in the atmosphere. Particular attention is paid to the use of local timber from sustainable forestry. Instead of sealing the visible wooden surfaces, they are simply treated with natural oils. Gypsum fibreboards and plaster are coated with breathable silicate paints, which contribute to the natural climate control of the rooms thanks to their moisture-regulating properties. Heat is generated using a heat pump and distributed via underfloor heating. Domestic hot water is generated decentrally using instantaneous water heaters, which means that there is no need for energy-intensive heat storage tanks.


A large-scale PV system is planned on the 60-degree pitched roof surfaces. Thanks to the east-west orientation, consumption peaks in the morning and evening are to be covered. In combination with an electricity storage system and highly efficient, presence-controlled LED lighting, the aim is to achieve a self-sufficiency of around 60%. Rainwater is collected in cisterns and used for watering the garden and possibly for flushing toilets. The use of grey water for flushing toilets will be examined in more detail. These measures optimise the building technology and minimise operating costs.


The aim is to achieve CO₂ savings of over 50% during operation compared to conventional new buildings, which also enables the option of a KfW 40 building.T


Status: In progress Client: Private Year: 2024 Size: 215 m² GFA


Marc Dufour-Feronce, Leonard Goldenbaum, Andreas Reeg

rundzwei Architekten Reeg&Dufour PartGmbB

Goethestraße 2-3
Staircase B
10623 Berlin

T +49 30 202 376 45
F +49 30 202 376 45 9

Current Job offers at rundzwei


Junior Architect (m/f)

rundzwei is always looking for talented and enthusiastic young architects. We are looking for junior architects fresh from university or with 1-2 years work experience for a range of design and execution projects. Please send your meaningful application in form of a project portfolio (not larger than 5MB) to iwannabe[at]rundzwei.de. We are awaiting your application with anticipation!

Office Assistant (m/f)

rundzwei is looking for a office assistant preferably with BA background for a full-time position. Your tasks are among others the office management, salary accounting and assistance to the office owners. You have 2 years work experience within other architectural offices then send us your meaningful application to iwannabe[at]rundzwei.de. We are looking forward to your application!

Team Leader / Project Architect (m/f)

rundzwei is looking for architects with at least 4-5 years work experience. Ideally you have been leading a project from concept design, through planning up to and through construction phase. You are creative and you like special solutions, you are interested in detailing then send us your meaningful application with work samples (not larger than 5MB) to iwannabe[at]rundzwei.de. We are looking forward to receiving your application!