KVWL, Dortmund

KVWL Extension – Dortmund, Germany
Project overview

The KVWL building houses the Association of Statutory Health Insurance Physicians in Dortmund. Architects SSP (Schürmann Spannel AG) designed an extension to the existing headquarters, focusing on transparency and energy performance. The building accommodates open‑plan offices and meeting rooms for healthcare administrators who require comfortable working conditions.

Design challenge

The extension features large glazed façades to admit natural light, yet the offices must maintain visual comfort and avoid overheating. Dortmund’s temperate climate means that both summer solar gains and winter heat losses are concerns. A shading and glazing system was needed that could deliver low solar heat‑gain coefficients (SHGC) while preserving a high level of daylight and view quality.

RetroSolar strategy

The extension uses greenish solar‑control glazing type 50/25 combined with RETROLux 50 mm blinds
retrosolar.us
. This combination achieves a g‑value of approximately 0.1 when the blinds are in the open position
retrosolar.us
. The blinds have reflective surfaces that bounce sunlight out, and their small slat width provides fine control over the light entering the offices. The high transparency of the glazing ensures that when the blinds are open, occupants enjoy clear views and natural light.

Building physics and performance

By achieving a low SHGC with the blinds open, the system reduces the need for additional shading or tinted glass. The reflective slats minimise heat build‑up in summer, while the triple glazing provides insulation in winter. The combination allows the building to meet energy standards and improve occupant comfort. The simple operation of the blinds gives staff control over glare without compromising the façade’s appearance.

Architectural outcome and significance

The KVWL extension demonstrates that high levels of transparency and energy performance can coexist in office buildings. The integration of RetroSolar blinds provides fine‑tuned daylight control and emphasises the building’s lightness. The project serves as a reference for healthcare and administrative buildings seeking to create healthy work environments while meeting sustainability goals.