Berlin — International
Complex projects in transport and infrastructure, urban planning and custom builds — sustainable, digital, BIM-oriented, and international.
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Selected projects
What we do
From the feasibility study through to detailed design and tendering, we support complex projects with an interdisciplinary team of architects and engineers.
Sustainability
How sustainable a building will be is decided in its first design phases. Sustainability is therefore not an additional requirement for us but part of good architecture: we take the whole life cycle into our decisions and develop durable, adaptable solutions that spare resources and keep CO₂ emissions as low as possible.
Ecological, economic and social requirements are drawn together with the specialist disciplines involved into one integrated concept.
Not every sustainable building needs a certificate. Where one is wanted or required, we build its criteria into the design early and coordinate the evidence. Sustainability then becomes measurable, comparable and independently verifiable.
Depending on the project and the system, we take on the auditor or assessor services or guide clients and design teams through the whole process:

New buildings, refurbishments, existing buildings and districts, plus ESG verification against the EU Taxonomy.

Lets owners, investors, operators, tenants and occupiers introduce sustainability criteria for their buildings.
Design support towards the AFBA seal for allergy-friendly and healthy building.
Buildings of every asset class, districts, and interior and exterior spaces are certified — medically and scientifically verified. The seal complements existing asset certifications and is 100% ESG compliant.
Sustainability shapes not only our projects but also the way we operate as a company. We have EcoVadis independently assess our performance across environment, labour and human rights, ethics, and sustainable procurement — in November 2025 we were awarded the EcoVadis silver medal.
"Planning sustainably means translating responsibility into concrete decisions — traceable, deliverable, and of lasting benefit to clients, to the people who use the buildings and to the built environment."
The studio
Bettina Dittemer and Fabian Zimmermann found atelier 4d in Berlin, for architecture of substance with a particular focus on infrastructure and on urban planning around railway stations.
Careers
Are you interested in exciting major projects and do you enjoy working in a great, international team? Then take a look at our current job openings – maybe there's something just right for you! No suitable position advertised at the moment? No problem – we are always happy to receive your speculative application including portfolio.
Currently no positions available but we are always looking for talented and motivated individuals. Please feel free to send your speculative application!
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