Six Advocaten is regularly sought-after for assistance on environmental, spatial, and public law matters. The group is led by Anita Nijboer, who manages permits for industrial clients, focusing on fire safety, explosion risks, and waste; Fleur Onrust, an expert in nature conservation, including nitrogen and protected species regulations; Irma van den Berg, who specialises in permits, zoning, and sustainability; and Hanneke Ellerman, who handles zoning and planning proceedings for commercial and residential developments.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘Six Advocaten’s practice stands out for its unique mix of top-tier legal expertise and practical, solution-driven advice. The team is approachable, responsive, and truly collaborative.’
- ‘Hanneke Ellermann is remarkable and a pleasure to work with. She combines extensive knowledge and experience with the ability to delve deeply into complex matters whenever necessary.’
- ‘Fleur Onrust is a valuable team member. She is a well-known and respected counsel in nitrogen deposition-related environmental permits and court cases. I would recommend her to anyone.'
- ‘Fabian Horsting and Irma van de Berg stand out for their strategic insight, accessibility, and genuine commitment to achieving the best outcomes. The team is responsive, collaborative, and innovative.’
- ‘Good law firm for administrative law, mainly focused on construction, development, and spatial planning.’
- ‘Extensive expertise in the field of nitrogen.’
Key clients
- Museum Voorlinden
- De Lelie Vastgoed
- Amrâth Hotels & Restaurants
- GEM Bloemendalerpolder
- BPD Development
- Refresco Benelux
- BCI Global
- SwifterwinT
- EEW Energy from Waste
- Black Tulip Settlement & Zuider Vastgoed
Work highlights
Advises and litigates for Museum Voorlinden, a contemporary art museum at a country estate in Wassenaar, about all kinds of environmental issues and permits for changes, including the nature permit for a new car park.
Advises and litigates for GEM Bloemendalerpolder, a consortium of project developers, in numerous procedures about a large-scale housing project, on issues including nature conservation, nitrogen emissions, spatial planning, and the hydrologic regime.
Providing advice and procedural support for SwifterwinT on the Windplan Blauw project, a significant wind energy initiative in the municipalities of Dronten and Lelystad, Flevoland, that entails the replacement of 74 existing wind turbines with 61 larger, more powerful turbines.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Anita Nijboer
Practice head
Anita Nijboer; Irma van den Berg; Hanneke Ellerman; Fleur Onrust
Other key lawyers
Siep Jan de Haan; Lisa Marie Kes; Fabian Horsting