Except Integrated Sustainability
Except Integrated sustainability.
Flourish in a changing world.
Multi-disciplinary consulting, innovation and development organization working on advanced sustainability projects around the globe.


Client > Association for Innovation in Dutch Horticulture


SIGN aims at a vital, sustainable socially valued horticulture cluster in 2030. To achieve this SIGN develops powerful innovation perspectives with a short term perspective and a long term vision, that inspire and shift the sector.

These innitiatives transcends the interests of the individual companies and established institutions. They are strategic, pre-competitive and serve the sector interest. They mostly concern the high risk start-ups that pose high thresholds for third parties.

Website SIGN

SIGN and Except have been working together on a variety of projects to advance the innovation capacity of the Dutch greenhouse sector. Starting as a collaboration for the purpose of communication, this quickly expanded to jointly developing whole concepts such as Polydome, the redevelopment of Schiebroek-Zuid, the Venlo Greenhouse Landscape and the Hortus Celestia vertical agriculture tower.


Sustainable Schiebroek-Zuid

Mar 01, 2018, Redevelopment of post-war social housing

We developed a sustainabile conversion and development plan for the post-war social housing area Schiebroek-Zuid in Rotterdam.  The project provides a flexible and exemplary roadmap for converting the neighborhood into a self-sufficient and sustainable area. It applies innovative energy solutions, urban farming, social and economic programs, secondary currencies, and adaptive redevelopment strategies.

This project was commissioned by housing corporation Vestia and agricultural research network InnovatieNetwerk.



Jul 20, 2016, High Performance Sustainable Polyculture Agriculture

Polydome is a revolutionary approach to greenhouse agriculture that offers the possibility of commercial scale, net-zero-impact food production. The Polydome system strategically interweaves a wide variety of crops and animals, taking advantage of every inch of the greenhouse while eliminating the need for synthetic fertilizers and pesticides.

With its high yields (60 – 90 kg per square meter), and diverse outputs (over 50 crops, two mushroom varieties, chickens, eggs, fish, and honey), even a small Polydome system can provide a richly varied food supply for a large population.

Download the full Polydome book for free below.


Portal to Venlo

Oct 10, 2014, Sustainable Greenhouse Industry Area Development (2010)

The Portal to Venlo offers the greenhouse industry in the east of the Netherlands a model to develop a sustainable industry. The project re-imagines an existing greenhouse industry area, currently fragmented, inefficient, dangerous for bicycle tourists that cross the area and in general rather unappealing.


Hortus Celestia

Aug 21, 2017, Vertical farm & office tower

The Hortus Celestia is a vertical farm tower, designed for Naaldwijk, the Netherlands. The tower rises 28 stories high above the greenhouse-filled landscape, offering 14 farming floors with embedded expo centers.

The tower functions as a demonstration center for innovative Dutch greenhouse industry partners, and attracts international visitors from around the globe.