A SYSTEM FOR ARCHITECTURE
Wooden windows.
Reconsidered.
Designed for architecture. Built for the future.
Manifesto
We think in systems, not products.
In proportion, not size.
In decades, not seasons.
01 — Philosophy
Reduction to the essential.
A window is not a product to be compared, but a boundary to be composed. It mediates between interior and exterior, between the desire for openness and the need for shelter.
dasHolzfenster is built on a single idea, architectural clarity comes from reduction. We remove what does not belong, so what remains feels inevitable.
Clarity
Architectural logic before product logic.
Separation
Interior and exterior can differ.
Longevity
Designed in decades, not trends.
Discretion
Technology that stays out of sight.
02 — Design & Detail
Slim profiles.
Quiet proportion.
Every line serves composition.
Sight-lines stay narrow. Profiles are precise.
Proportion holds, at every scale.
03 — Flexibility
One system —
many architectural expressions.
Whether in a listed villa, a contemporary residence or a complex geometry, the same system adapts without compromise.
From fine-grained heritage façades to contemporary architecture, without changing the system.
Interior and exterior can speak different languages, yet belong to one family.
Heritage
Sensitive restoration of historic fabric.
Classical
Proportion and rhythm across the façade.
Interior
Calm light, warm wood, considered depth.
04 — Special solutions
Arches, circles, geometries that resist standard.
Demanding architecture asks for more than rectangles. The system absorbs complexity, from arched openings and round windows to tall composed units, without losing its calm.
See applications
05 — Performance
Outcomes, not specifications.
Energy
A well-insulated building envelope reduces energy demand — consistently, across all seasons.
Acoustic
Streets and cities soften. Rooms become rooms again.
Durability
Materials chosen and detailed to age without apology.
Security
Protection that is felt, not seen.
Material
Wood, on its own terms.
Wood is not a surface. It is a material that changes over time.
It carries structure, depth and memory. It responds to light, to use, and to age.
In architecture, this is not a weakness. It is a quality.
dasHolzfenster is built around this understanding. Wood is not concealed. It is used where it matters, with clarity, precision and respect for its nature.
How we work
A system, and a way of working.
dasHolzfenster is not a single product. It is a system and a way of working. We operate across three levels:
System
A next-generation window system developed from architectural principles, focused on proportion, flexibility and long-term performance.
Partnership
Collaboration with selected manufacturers, architects and developers to bring the system into real projects.
Development
Support in planning, detailing and system integration, from early concept to execution.
Michael Müller — Founder
06 — Founder
Thirty-five years of windows.
One clear conclusion.
Michael Müller developed his career through craftsmanship, production, and executive leadership, across both Germany and the United States. During the past fifteen years, he oversaw complex window and façade projects, including work for KORN and Tischler und Sohn.
During that time, one clear realization emerged: architecture requires a timber window system that systematically combines design freedom with technical precision.
dasHolzfenster is the response to that experience.
About the Founder
About the Founder
Michael Müller began his professional career as a craftsman and, over more than three decades, developed a deep understanding of materials, construction, production, and architectural requirements.
His path led him through production, project management, and executive leadership, including many years serving as managing director and overseeing demanding window and façade projects in both Germany and the United States.
During the past fifteen years, he held leading responsibility for the development and realization of complex window and façade solutions, including his work for KORN and Tischler und Sohn, both established companies known for demanding architectural projects.
Throughout his entire career, one central realization remained constant:
There was no timber window system capable of meeting the architectural demands of modern projects without continuously relying on highly individualized custom solutions.
dasHolzfenster is the systematic response to that experience. A system developed from practice, technical precision, and the ambition to support architecture more effectively over the long term.
A system for architects and partners
Begin a quiet conversation.
We work with a small number of architects, developers and production partners. Reach out, we'll respond personally.