For over 25 years, Except Integrated Sustainability has worked at the intersection of strategy, design, and systems thinking to build the foundations of a sustainable society.

Founded in 1999 in the Netherlands, Except has delivered hundreds of projects across Europe, Asia, the Americas, the Middle East, and Australia. Our work spans sustainable cities and neighborhoods, circular industries, regenerative agriculture, renewable energy systems, data platforms, governance trajectories, and systemic investment strategies.

From energy-neutral buildings and district heating visions to national agriculture initiatives and sector-wide circular roadmaps, we operate across scales and sectors with one consistent principle: sustainability must work in practice.

Except_Team

What we do

We develop:

  • Long-term visions and transition strategies for organizations, industries, and governments
  • Integrated masterplans for cities, districts, eco-industrial areas, and regenerative landscapes
  • Circular and decarbonization roadmaps across supply chains
  • Climate adaptation and resilience programs
  • System maps, impact assessments, and decision dashboards
  • Training and capacity building for leaders and sustainability teams

Our clients include municipalities, national ministries, multinationals, universities, infrastructure providers, and pioneering developers. We collaborate closely with stakeholders to turn complexity into clear action.

A systemic track record

Our portfolio includes:

  • Pioneering ecosystem-driven urban concepts and climate-adaptive public spaces
  • Circular industry transformations and supply chain dashboards
  • Large-scale renewable agriculture initiatives in water-scarce regions
  • District heating visions and fossil-independent energy systems
  • Timber construction system transitions
  • Knowledge platforms for sustainability innovation
  • Governance and financing frameworks for climate adaptation

Across all projects, we focus on systemic impact: not isolated interventions, but structural change.

We draw lessons and knowledge from these global experiences and help spread knowledge across boundaries with lectures, publications, and projects. Please review our project archive to read about developments we've been able to share over the last two decades working around the world.

How we work

At the core of our practice lies Symbiosis in Development (SiD), our integrated systems thinking framework. Developed and refined since 1999, SiD connects environmental performance, economic viability, social equity, health, culture, and governance into one coherent methodology.

This allows us to:

  • Identify leverage points within complex systems
  • Align sustainability ambition with financial feasibility
  • Design phased roadmaps that deliver measurable impact
  • Avoid fragmentation and greenwashing
  • Create solutions that are resilient, adaptive, and scalable

We combine research, data analysis, engineering, design, facilitation, and business strategy into integrated trajectories from idea to implementation. Read more about our approach here.

Our commitment

Except is a purpose-driven enterprise. Our mission is to create resilient, just, and inspiring systems that enable long-term prosperity within planetary boundaries. We operate with intellectual independence, scientific rigor, and a deep belief that sustainability is not a constraint on progress, but its foundation.

We do not chase trends. We design futures that endure.

Our short film: "A passion for Change"




A Passion for Change from Gabriel on Vimeo.

Since its founding in 1999, Except has been a purpose-driven enterprise with a mission to develop the foundations of a sustainable society. In 2009 we published the Except Company Principles, which we have strictly adhered to since.

These principles set a new standard for social entrepreneurs worldwide. This stringent ethical framework ensures our work is always fair, transparent, independent, and quality controlled, among many other values.

They promote the practice of far-reaching health and well-being for employees and stakeholders, including a 4-day workweek, full workplace autonomy, profit-sharing, and a strong diversity policy.

Except is an ecosystem of organizations, that together and in their own unique ways, support systemic sustainable development. In collaboration, the Except Group enables a wide range of partners to join forces and make a real difference.

The Except Group is spearheaded by the Except Integrated Sustainability Foundation, a certified and registered Dutch non-profit. Consultancy projects are managed by Except Integrated Sustainability BV, whereas Except Sustainable Ventures BV manages all investible development projects.

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Except Integrated Sustainability was founded in 1999 by 19-year-old Tom Bosschaert while studying Industrial Design Engineering at the Delft University of Technology. Tom quickly found that both the academic and the corporate worlds were in dire need of more innovative and systemic strategies to address complex and global problems such as environmental destruction, poverty, hunger, and climate change.

Except was the vessel to set out and change this. Upon its foundation, Tom embarked on a lifelong journey and learning trajectory to not just find answers for our most pressing concerns but to develop better tools and frameworks to help address them.


2000

In Perth, Australia, the first edition of what later became the Symbiosis in Development (SiD) framework, Except's comprehensive, integrated system thinking methodology, was first used to help find a solution for a struggling community in rural Western Australia.

SiD's integrated approach brought together the physical, environmental, economic, cultural, and social concerns in a single strategy and design process. The result was an unexpected, resounding success - a profitable Spirulina algae farm and community project with systemic environmental and social benefits.

Following this proof of working with SiD to find better solutions to societal challenges, Tom further developed SiD as a free, open-source framework for systemic, sustainable development. Except's team grew, using SiD to answer complex, challenging questions of organizations worldwide. At this time, the SiD process adopted more areas of systems thinking and design thinking and included lessons from Agile project management.

2006
Tom used SiD to develop the seminal concept for the San Francisco Transbay Center / Salesforce park, boosting city-wide ecological values, social gain, and a successful business model. The concept won the decade's most significant global architectural competition. Realized over a decade and formally opened in 2020, this further proved the timeless power of SiD's integrated systemic approach.

2009
Except moved its headquarters to Rotterdam, the Netherlands, coinciding with Except's founding of its first community of social entrepreneurs, the Rotterdam Collective (Ro-Co). Ro-Co is still operating and has supported approximately 500 social entrepreneurs since its opening.

2011
Except published its master plan for converting the social housing neighborhood Schiebroek-Zuid. A project ahead of its time, enabling the transition of a problematic social housing area into a flourishing, socially connected community driven by ecosystem services. The financially feasible master plan ensured the site became energy and water neutral, socially connected, and provided >50% of its food needs from local production —a global breakthrough for social housing.

2014
The Except Integrated Sustainability Foundation (Stichting) was founded to support the autonomous innovations of the Except team that aim to build the foundations of a sustainable society. Additionally, this project supported the further development and publication of the Symbiosis in Development (SiD) framework.

2017
Except moved its headquarters to the city of Utrecht following the opening of its second, larger professional community, the Utrecht Community (UCo). UCo houses over 25 companies and 150 experienced sustainability experts in an exemplary renovated heritage-listed building designed and developed by Except.

2019
Except counted more than 700 projects worldwide as part of its portfolio while having trained, supported, and facilitated more than 270 sustainability professionals. This year, the Except Foundation published the first complete book on Symbiosis in Development, spanning almost 20 years of development. The book is available today, fully open-source, and freely available in digital form from the SiD website.

2022
Except opens its offices in Ho Chi Minh City, in Vietnam. Followin the mission of creating the foundations of s sustainable society, where better to do this than one of the fastest growing economies in the world? Starting out with strategy services, projects quickly included f&B, resorts, hotels, and industrial parks.

Today
Except continues to focus on the most pressing problems of our time with a dedicated and agile team of experienced sustainability professionals from over eight different countries.