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. Shadow gaps 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 — arched openings, round windows, 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 has spent his career across craft, production, and leadership in the window industry — in both Germany and the United States. A system developed from practice — not from theory. dasHolzfenster is the result of that experience.
About the Founder
About the Founder
Michael Müller began his career as a craftsman, building a deep understanding of materials, construction, and detail from the ground up.
Over more than three decades, he moved through production, project management, and executive leadership, including roles as managing director.
In the past 15 years, he held leading responsibility for the development and delivery of complex window and façade solutions — including his work with KORN and Tischler & Sohn, both well-established companies known for demanding architectural projects.
His work has always been defined by a combination of technical precision and strategic thinking — from highly customized projects to the development of systems and structures.
With extensive experience in the window industry across the German and U.S. markets, he has developed a clear perspective on what architecture requires — and where conventional systems fall short.
dasHolzfenster is the result of that experience. A system built not from theory, but from practice — shaped by the realities of production, design, and long-term performance.
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.