# Ersatzneubau Winkel: A Sustainable Residential Replacement in Roggliswil Kollektiv.w AG replaces a former production hall with a modern, senior-friendly residential structure. - **Source:** [ArchDaily Global](https://brifing.si/source/b856ce4a-b51b-4705-954b-40620e034caa) - **Published:** 2026-11-05 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/711cf99e-9791-4a8d-8856-2ef599ec4a36 ## Project Site Transformation The project, located in Roggliswil, Switzerland, involved the transformation of a site previously occupied by a small production hall. Nestled between existing residential buildings and mature trees, the location presented unique spatial constraints. Kollektiv.w AG managed the site redevelopment, completing the new residential structure in 2024 with a total area of 122 square meters. ## Structural Assessment Challenges Initial plans aimed to preserve and extend the former production hall to create a senior-friendly apartment. However, professional structural assessments determined that such an intervention would require extensive and costly modifications. Consequently, the design team opted for a complete replacement building, ensuring long-term safety and functionality for the future residents of the property. ## Design Strategy and Layout The architectural design of the new building is directly informed by the footprint of the original production hall. By basing the floor plan on the previous structure, the architects maintained a coherent spatial relationship with the surrounding environment. This approach allowed for an efficient use of the limited available space on the plot. ## Material Selection and Composition The construction of the Ersatzneubau Winkel project utilizes a combination of wood and concrete. These materials were selected to balance structural durability with aesthetic integration into the green, tree-filled landscape of Roggliswil. The use of these specific materials reflects a modern approach to residential architecture, prioritizing both longevity and environmental contextual harmony. ## Team and Execution Roles The project was executed by Kollektiv.w AG, with a specialized team handling different phases of development. Flavio Staffelbach served as the lead architect, while Tobias Küchler managed the design aspects. Christian Tschopp oversaw the technical requirements of the build, ensuring that the transition from the former hall to the new residence met all standards. ## Context of Residential Replacement Replacement building projects, or Ersatzneubau, are common in Swiss architectural practice when existing structures no longer meet modern safety or energy efficiency standards. By replacing outdated industrial shells with residential units, architects can densify living spaces without expanding the building footprint, effectively utilizing land that is already serviced by existing local infrastructure. ## Senior-Friendly Design Considerations The primary objective of the new structure was to provide a senior-friendly living environment. This design philosophy typically involves barrier-free access, optimized floor plans, and ergonomic layouts that accommodate aging residents. By focusing on these specific needs, the project addresses the growing demand for accessible housing within established residential neighborhoods in Switzerland. ## Architectural Impact and Legacy The completion of this project in 2024 demonstrates a pragmatic approach to urban renewal. By prioritizing structural integrity over preservation when necessary, the architects successfully revitalized a constrained site. The building serves as a model for how small-scale residential developments can integrate seamlessly into existing landscapes while providing modern, functional living spaces. ## Sources covering this story - https://www.archdaily.com/1188023/ersatzneubau-winkel-kollekti-ag — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._