GROOF - Greenhouses to Reduce CO2 on Roofs

Project Summary

The GROOF project is an innovative cross-sectoral approach to reduce CO2 emissions in the construction and agricultural sectors by combining energy sharing and local food production. The idea is to use roof greenhouses as a tool for:
   - recovering actively the produced and not consumed heat generated and otherwise lost by the building that supports the structure (through the ventilation system) and passively (30% heat lost through the roofs on average) in vegetables and herbs production,
   - collect CO2 produced by human activity and building activities to "feed" the plants,
   - reduce transport-generated CO2 emissions by producing plants locally.  The greenhouse itself is an extra activity located outside of the building but sharing energy with it in order to make both of the structures more efficient.

Concretely, the project will facilitate the emergence of this type of greenhouse on the market by demonstrating and disseminating among the actors of construction and agriculture good practices favorable to the development of profitable and functional business and social models.

The project will aim specifically at:

   - identifying and reducing barriers to market access (urban planning rules, technical regulations, insurance, etc.),
   - supporting first users in the implementation of their project,
   - experimenting and demonstrating the effectiveness of technology for a representative number of business and social models. The results of each activity will be shared with the target communities (e.g. regional and national public authorities, SMEs and large companies, research centers).

GROOF will invest in four pilots, designed to prove the effectiveness and durability of the models related to different building types. GROOF will then launch this solution on the European market.


Let's keep in touch ! Subscribe now to our mailing list


Project Partners

  • Université de Liège, Gembloux Agro-Bio Tech

    7 Place du 20 août

    View partner details

  • EBF GmbH

    24 Robert-Bosch-Straße

    View partner details

  • ASTREDHOR: Institut Technique de l’Horticulture

    44 rue d’Alésia

    View partner details

  • Centre Scientifique et Technique du Bâtiment

    88 avenue Jean Jaurès

    View partner details

  • Hochschule Trier Institut für angewandtes Stoffstrommanagement

    9926 Campus Allee

    View partner details

  • Groupe One

    69 rue de la Station
    Braine le Comte

    View partner details

  • Cluster Eco Construction

    1C Rue Eugène Thibaut

    View partner details

  • Universitat Autònoma de Barcelona

    Ed. Rectorat Campus de la UAB s/n
    Cerdanyola del Vallès

    View partner details

  • Les Jardins de Gally

    Ferme de Vauluceau Route de Chèvreloup

    View partner details

  • Institut de Formation Sectoriel du Bâtiment

    5 Zone d’Activité Economique Krakelshaff

    View partner details

  • Conseil de Développement Economique pour la Construction

    5 Zone d’Activité Economique Krakelshaff

    View partner details

Lead partner

Organisation Address Email Website
Conseil de Développement Economique pour la Construction 5 Zone d’Activité Economique Krakelshaff
Name Contact Name Email Country
Université de Liège, Gembloux Agro-Bio Tech Haïssam Jijakli Belgium
EBF GmbH Franz Schreier Germany
ASTREDHOR: Institut Technique de l’Horticulture Guillaume Morel-Chevillet France
Centre Scientifique et Technique du Bâtiment Maeva Sabre France
Hochschule Trier Institut für angewandtes Stoffstrommanagement Thomas Anton Germany
Groupe One Marc Lemaire Belgium
Cluster Eco Construction Hervé-JAcques Poskin Belgium
Universitat Autònoma de Barcelona Xavier Gabarrell
Les Jardins de Gally Nicolas Brulard France
Institut de Formation Sectoriel du Bâtiment Christophe Mélon Luxembourg

On September 24 and 25, 2019, the jury of GROOF experts in construction, energy, vegetable production, business model gathered to analyse the various applications that will benefit from the first part of the one-year coaching, from September 2019 to September 2020, to help them build, develop and implement their rooftop greenhouse.

The group has decided to select 10 projects located in France, Belgium and Luxembourg that aim to reduce the impact on CO2 emissions by building a rooftop greenhouse. These projects bring together different techniques of greenhouses: hydroponic greenhouses, aquaponics, vegetable gardens in-soil, etc. As well as different types of greenhouse projects : educational, social, private, etc.


Adhoc habitat participatif

Location: Kirchberg (Luxemburg)

Adhoc habitat participatif is a non-profit in Luxemburg aiming at providing affordable housing for a long-term stable community. With their rooftop greenhouse, they will strengthen social cohesion among the residents by creating connection to the environnement.

👉 Read more on the presentation sheet


Location: Brussels (Belgium)

The goal of the greenhouse « Green(s)pote» led by Les amis de l'Entrepote​ in Brussels (Belgium) is to enable the neighbours to garden all year long and produce vegetables such as tomatoes, peas, salads, herbs, etc. A part of the production will directly go to the kitchen of Belgobon, the restaurant just below the Garden.

👉 Read more on the presentation sheet

J'habite mon jardin

Location: Tour (France)

"J'habite mon jardin" project was created by Tours Habitat, the social housing organization of Tours city. The greenhouse is designed as a tool for social inclusion. The production of vegetables and fruits is mainly intended for future inhabitants of the site. The production part will be supplemented by training, animation, communication towards a wide audience, from students ‘groups to urban farmers.

👉 Read more on the presentation sheet

ISA/Yncrea - Lille

Location: Lille (France)

Yncrea engineering school wants to create the first future city’s European demonstrator of food & agriculture. The figurehead of this project will take place in an historical building of the city of Lille called « Palais Rameau » just next to Yncrea’s actual campus.
In this 3000 square meters space, Yncrea will create different areas related to local food production and transformation in the city. Yncrea will create different areas including: a Biohacking space for project based pedagogical approaches (including an urban farm), a food factory, a teaching center, an innovative showroom, a start-up incubator, a vertical farming experimental unit, an open space for the citizens.

👉 Read more on the presentation sheet

Les Petits Poucets

Location: Namur (Belgium)

Les Petits Poucets” will pursue two objectives, firstly it will produce and sell in the city center of Namur healthy, fresh and tasty products, and secondly it will provide training cycles for the project developers.

👉 Read more on the presentation sheet

Culina Hortus

Location: Paris (France)

Cueillette Urbaine is a company that works for the development of urban farming and its benefits for cities. Their goal is to design, install and operate productive and ecological urban farms. They want to create a turnkey urban farm system that consumes little energy and is totally environmentally friendly while being productive. Through Culina Hortus, they plan to build up the first aquaponic and bioclimatic greenhouse farm in France on the rooftop of the 12th floor of a Parisian building (PARIS 12).

👉 Read more on the presentation sheet


Location: Liège (Belgium)

Novacitis is willing to create synergies through the Four food-related units that they will be built up in the former carpentry of the City of Liège : a roof production area, a cafeteria, a local food store and a food processing unit. It will welcome small groups for awareness-building activities offered to local schools and during team-building events organized for enterprises.

👉 Read more on the presentation sheet


Location: Nantes (France)

This project of 400 square meters space is located in Nantes, France, on the roof of an existing 24-apartments residential building. It will offer to inhabitants a new volume to be invested for various common activities: shared garden, urban agriculture experimentations, educational venue for the neighbourhood. The architectural project transforms the image of a social housing neighbourhood.

The SYMBIOSE core project team is composed of the building owner Nantes Métropole Habitat (NMH), Greenhouse-on-top (former Ecotropy), Claas architects and SCE. NMH is the leading coordinator. Greenhouse-on-top is in charge of the coordination of R&D activities.

For the project, they are bound by a consortium agreement with the companies LEGENDRE, CMF and the public research organization IFSTTAR.

👉 Read more on the presentation sheet

Pousses & Vous!

Location: Brussels (Belgium)

Pousses & Vous! has the vocation to develop pedagogical projects in primary and secondary schools, in tight collaboration with the teachers, through field role-playing situations activities. They aim at contributing to the education and awareness of young people on the importance of supporting smart local activity to meet demographic challenges while respecting the environment and being involved in a social approach.

The core business of this rooftop including a greenhouse at See you in Brussels, Belgium, consists in school visits while the harvests represent the by-products socially valued through donations to caritative organizations.

👉 Read more on the presentation sheet

Toits Vivants

Location: Arcueil (France)

The project consists of developing a multifunctional urban greenhouse and a common vegetable garden located on the rooftops of apartment buildings available to the residents.

The implementation of this project was driven by the real estate developer Axone Promotion who wants to provide the residents of its buildings with new common areas in connection with food production. Toits Vivants is an association which aims to develop integrated and participatory edible ecosystems.

👉 Read more on the presentation sheet



During the coaching, the early adopters will have personalised advises, thematic training days, and visits on their rooftop greenhouse (RTG) site if exists.

They will benefit from:

1. Saving time and money while benefiting from free, accurate and professional advice on the entire process of a roof-mounted greenhouse project.
2. Personalized coaching by European experts in the fields of energy, building, food production and business model
3. A certificate from our experts, allowing us to have more legitimacy and influence with potential investors.

Applicants will also benefit from the visibility of this international project funded by the European INTERREG programme, in partnership with many international organisations specialised in construction, urban agriculture and research.




The first part of the coaching take place between September 2019 to September 2020. During this year, 10 early adopters will be coached. During the second part, September 2020 to March 2021, 4 early adopters, out of 10, will continue to be coached by us. See the image below to visualise the agenda.


You want to be kept informed of the GROOF open call ? Subscribe now to our mailing list

Keep me informed


How rooftop greenhouses can reduce the environmental aspect of horticulture

Posted on

Sealing ground is a problem which negatively impacts the water balance since the soil cannot be used as a water puffer anymore. This results in surface water not being able to be added to the groundwater level which can directly lead to flooding. On the other hand, this water does not get added to the groundwater which can have severe consequences for the quality of the groundwater and the actual amount. Lacking groundwater will lead to more concentrated toxic substances and in the far run to possible draughts. Read More

Increase building's attractivity

Posted on

A rooftop greenhouse (RG) is not a simple agricultural production tool. It is a way to increase the whole building value, and to show your interest in modernity and ecology. Rooftop greenhouse can be used to product fruits and vegetables only, in an intensive way, or can also be seen as a place for people to meet and exchange. Read More

Festa de la Ciència, Barcelona

Posted on

This past weekend, 26 and 27th of October, the Sostenipra research group from ICTA-UAB, along with the GROOF project took part in the Science fair “Festa de la Ciència” coordinated by the City of Barcelona. It was the 13th edition performed at the public space “Moll de la Fusta” during which lots of citizens who were interested in science and technology got the opportunity to be closer to the different topics related to technological advances and catch up on current problematics that science and technology are helping to solve. Read More


Open call contact:

General contact:


Let's keep in touch ! Subscribe now to our mailing list


GROOF project is coordinated by the CDEC (Conseil pour le Développement Economique de la Construction), with the support of the INTERREG NWE programme, and carried out with eleven partners (public and private) from Luxembourg, France, Belgium, Germany and Spain.

Each partner brings valuable skills and knowledge to the project such as construction process and methodology, building energy management, urban agriculture development, knowledge of plants and cropping systems, entrepreneurial skills, socio-economic skills, etc.

Find the partners interviews here.

Company Country Field of expertise
Conseil de Développement Economique pour la Construction Luxembourg Building/construction
Université de Liège, Gembloux Agro-Bio Tech Belgium Agro-socio-eco
EBF GmbH Germany Energy/Technic
ASTREDHOR: Institut Technique de l’Horticulture France Agro-socio-eco
Centre Scientifique et Technique du Bâtiment France Energy/Technic - Building/construction
Hochschule Trier Institut für angewandtes Stoffstrommanagement Germany Energy/Technic - Agro-socio-eco
Groupe One Belgium Agro-socio-eco
Cluster Eco Construction Belgium Building/construction
Universitat Autònoma de Barcelona Spain Energy/Technic - Agro-socio-eco
Les Jardins de Gally France Energy/Technic - Agro-socio-eco
Institut de Formation Sectoriel du Bâtiment Luxembourg Building/construction


       Press release of the Open Call :       

            Download in English 

            Download in French


Official photos, logos and interviews are available in our Media Kit.



Nicolas Ancion - GROOF Open Call Project Manager : (+32 481 62 24 30)

Aurélie-Anne Jacquerye - Groupe One Project Manager : (+32 492 25 28 27)



Read more in the full interview of the partners

What expertise do you bring to GROOF project?

"We offer knowledge in circular economy and material flow management, especially in regards to energy and resource efficiency and management. HS-Trier/IfaS has also an expertise in environmental assessment methodologies, such as greenhouse gas emission accounting, in order to contribute to the identification of potentials to improve buildings’ environmental performance. Thus, we contribute to GROOF with technical support including technical monitoring of CO2e performance in order to maximise emission savings."

Thomas Anton: Hochschule Trier Institut für angewandtes Stoffstrommanagement, Germany

"Innovation, sustainability, health, three key words representing the impact of GROOF project!"

Pierre Raulier, Project Manager, Centre de Recherche en Agriculture Urbaine, Université de Liège, Gembloux Agro-Bio Tech, Belgium

Quelles seraient les principales raisons pour un développeur de projet d'installer une serre sur toit ?

"Au Luxembourg, un maître d'ouvrage pourra se convaincre de faire une serre sur le toit de son bâtiment en prenant en  compte les arguments suivants :

  • utiliser et rentabiliser un espace perdu
  • augmenter la performance de son bâtiment grâce à un système qui isole, voir chauffe son bâtiment tout en s'autofinançant
  • apporter une plus value dans la vie sociale des bâtiments de logement ou tertiaires."

Marcel Deravet - Sustainable construction project manager, Institut de Formation Sectoriel du Bâtiment, Luxembourg

What were the motivations of the Universitat Autònoma de Barcelona (UAB) to get involved in GROOF project?

"Transfer knowledge accumulated during the last ten years of work and research within ICTA-UAB in urban agriculture in southern Europe. Also, help promote Urban Agriculture in cities and, in this way, reduce CO2 emissions in buildings and make horticultural production more circular."

Xavier Gabarell Durany, Projet Leader, Universitat Autònoma de Barcelona, Spain.

Share this

Tweet Share