On 16 and 17 January 2026, around 500 landscape architects from German-speaking countries will gather for the bdla Site Managers’ Forum, our profession’s networking event. This time, the event will take place at a new venue: the Stadthalle Hagen.
The focus will once again be on legal issues such as the legally compliant review of supplementary construction contracts in service phase 8, contracts for work and services from a construction management perspective, and the IPA in private construction and public procurement law. In addition to updates on regulatory developments, the seminar will specifically address how to deal with conflicting regulations concerning concrete paving, level-access thresholds and accessibility.
The balancing act between technical specifications and creative freedom in design will also be discussed. Furthermore, there will be practical insights into modern irrigation systems and the application of soil protection regulations.
To round off the two-day training course, the programme includes two compact seminars on the ZTV Wegebau 2022 (to be repeated in 2025 due to high demand) and on soil protection/soil remediation, as well as four interesting field trips. Participation is optional.
Programme for the 2026
Site Managers’ Discussions
Friday, 16 January 2026
From 9.30 am
Conference registration
10.00 am
Welcome and introduction
by Prof. Stephan Lenzen, bdla President, RMP Stephan Lenzen Landscape Architects, Bonn
Update 2026
: News from the fabulous world of regulations
– Tom Kirsten, bdla Spokesperson for Construction Technology and Standardisation
The review of construction addenda in LP 8: architects’ obligations, requirements for addendum quotations, review procedures, conflict scenarios
Dr Sebastian Schattenfroh, specialist solicitor for construction and architectural law, Gaßner, Groth, Siederer & Coll. Law firm partnership, Legal Adviser to the bdla, Berlin
12.30 – 1.30 pm Lunch break
Cooperation in contracts for work and services from a construction management perspective
Prof. Dr Felix Möhring, Department of Landscape Architecture and Environmental Planning, Specialism in Construction Economics and Management in Landscaping, Ostwestfalen-Lippe University of Applied Sciences, Lemgo
Regulatory frameworks for concrete paving – abundance, contradictions, a vision for reorganisation
Dietmar Ulonska, until 2024 Concrete Association for Roads, Landscapes and Gardens e. V. (SLG), Bonn
3.30 – 4.00 pm Coffee break
Between regulatory frameworks and design freedom – planning and construction as a challenge amidst a conflict of diverse requirements
Prof. Astrid Zimmermann, Faculty of Agricultural Sciences and Landscape Architecture, Department of Landscape Architecture, Chair of Design and Construction, Osnabrück University of Applied Sciences
Integrated Project Management (IPA) in private construction law and public procurement law – possibilities and limitations
Prof. Dr Mark von Wietersheim, Solicitor, Managing Director of forum vergabe e.V., Berlin
approx. 6.00 pm End of the first day of the event
Optional: 6.30 – 10.30 pm Get-together on site
– registration required; snacks and drinks available until 8.30 pm (€30 per person)
; from 8.30 pm, drinks at participants’ own expense
Saturday, 17 January 2026
9.00 am
Introduction
: Tom Kirsten, bdla spokesperson for construction engineering and standardisation
Level-access thresholds and accessibility: issues – regulatory framework – assessment
Silke Sous, Aachen Institute for Building Damage Research and Applied Building Physics (AIBau), Aachen
10.15 – 10.45 am Coffee break
Water sources, storage and demand
: Current requirements for automatic irrigation systems
Markus Illgas, Ulenberg Illgas Landscape Architects, Essen
Practical
application of the EBV and BBodSchV Prof. Dr Helmut Meuser, until 2023 Faculty of Agricultural Sciences and Landscape Architecture/Soil Protection and Remediation, Osnabrück University of Applied Sciences
12.45 – 13.45 Lunch break
From 2.00 pm Seminars & excursions (optional, subject to a fee)
14.00 – approx. 16.30 ZTV Path Construction
2022 – “And yet it moves…”
Expansion joints in construction methods using bound materials. Guidance for day-to-day planning
practice Arno Tröger, freelance landscape architect, officially recognised expert in horticulture and landscaping, Parkstein
14:00 – approx. 15:45
Approaches to case studies on the practical
application of the EBV and BBodSchV Prof. Dr Helmut Meuser, until 2023 Faculty of Agricultural Sciences and Landscape Architecture/Soil Protection and Soil Remediation, Osnabrück University of Applied Sciences
14:00 – approx. 17:00 FIELD
TRIPS
A: Ostpark, Bochum
Planning: City of Bochum, Henning Larsen (open space concept), BPR Ingenieure (drainage concept)
Excursion leader: Johanna Reisch, Director of Landscape, Henning Larsen Hamburg
. After the excursion, transfer to Bochum Central Station.
B: Hafenquartier Südliche Speicherstraße, Dortmund
Planning: City of Dortmund, post welters + partner Architecture + Urban Planning, brosk landscape architecture and open space planning (masterplan); Consortium: Landschaft planen + bauen NRW GmbH with Fichtner Water & Transportation GmbH (transport and outdoor facilities planning)
Excursion leader: Sebastian Kröger, Head of the Office for Urban Regeneration, and Heike Junk, Project Manager in the Nordstadt Team of the Office for Urban Regeneration, City of Dortmund, as well as Hellmut Neidhardt, BÜRO N, formerly Managing Director of Landschaft planen + bauen NRW, Dortmund
. After the end of the excursion, transfer to Dortmund Central Station.
C: Schwerte
Climate Garden Planning: City of Schwerte, Förder Landscape Architects
Excursion leaders: Lutz Zangenberg and Tobias Schlottbom, Förder Landscape Architects
After the end of the excursion, transfer to Hagen Central Station.
D: BOB Campus Oberbarmen, Wuppertal
Planning: Montag Stiftung Urbane Räume, Urbane Nachbarschaft BOB, City of Wuppertal, atelier le balto, Bauer+Fecke Landscape Architects
Excursion leaders: Véronique Faucheur, atelier le balto, and Guido Bauer, Bauer+Fecke Landscape Architects
. After the excursion, transfer to Wuppertal Central Station.
Concept and moderation
: Tom Kirsten, freelance landscape architect, Pirna, bdla spokesperson for construction technology and standards
With the kind support of
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