DU
Dipl.-Ing. Univ. Stephan Kohlhof
Düsseldorf, Germany
Dipl.-Ing. Univ. Stephan Kohlhof is a design firm in Düsseldorf, Germany, Rated for national design work on the cumulative record, one of 3,349 firms filing in Germany, strongest in 01-01, 12-05 and 20-03, acting for Henk Wyniger, Dr. Martin Hermans and Interroll Holding AG.
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IPRATE.EURated
DESIGNS · 2026
Confidence
High Confidence. The published tier reflects the selected country, vertical, track, and time window.
Vertical
Track
Window
Performance
Designs · National · Cumulative (20y)Rating
High Confidence
Distinct Clients
9
Success Rate
100.0%
Volume100
Success90
Speed43
Durability71
Renewals91
Domestic17
Practice profile
Top classes
01-01(25%)12-05(15%)20-03(14%)
Top clients
- Henk Wyniger
- Dr. Martin Hermans
- Interroll Holding AG
- GAIMX GmbH
- Cube Holding GmbH