Conventions for territorial cooperation: an instrument enhancing inter-municipal and multilevel cooperation

Conventions are contractual agreements that foster cooperation between municipalities and the State in Luxembourg. Conventions can cover a multitude of topics in the field of spatial planning and urban development.

Rationale for action

In Luxemburg, the national level sets the general political objectives and orientations of spatial planning and development. To a large extent, the competence for urban planning and development lies with the municipalities. An intermediate level between the state and the municipalities is missing; there is no regional level requiring neighbouring municipalities to coordinate their spatial planning procedures or future development options. Yet cooperation and coordination among all levels of government (vertical dimension) and with relevant actors at the same level (horizontal level) is necessary to achieve the objectives of a sustainable spatial development.


Conventions promote inter-municipal and multilevel cooperation to foster sustainable regional development, promote integrated planning and address specific development issues. In this context, conventions facilitate the vertical cooperation between the State and municipalities with the aim of implementing the objectives established in territorial strategies, such as the Master Programme for Spatial Planning (PDAT), the Integrated Transport and Spatial Planning Concept (IVL) and the Global Strategy for Sustainable Mobility (MoDu 2.0).

Time frame

The first convention of territorial cooperation was created on an ad-hoc basis in 2005. Since then, five more conventions have been signed. The process was formalised in 2013 with the Law of 30 July 2013 on Spatial Planning, which defined the procedure for concluding conventions with territorially contiguous municipalities. In the new Law of 17 April 2018 on Spatial Planning, conventions are defined as a proprietary instrument for the implementation of the objectives of spatial planning.

Key players

Municipalities and national authorities (in particular the Department of Spatial Planning and Development in the Ministry of Energy and Spatial Planning). Membership is voluntary and there are no explicit statistical, geographical or morphological criteria for joining. With the new Law of 17 April 2018 on Spatial Planning, municipalities do not need to be territorially contiguous anymore. The membership of a municipality is solely based on functional criteria: all municipalities in a convention area have a shared understanding of common challenges and opportunities.

Implementation steps and processes

A convention represents a contractual agreement between municipalities and the State. In accordance with the Law of 17 April 2018 on Spatial Planning, the initiative to establish a convention can come from either the interested municipalities or the Minister responsible for Spatial Planning. Following the approval by the Council of Government, the Minister can sign a convention with these municipalities. The actors draft the text of the convention in which the mission and objectives, the joint projects, the organisational structure, the procedural setup, and the budgetary provisions are defined. A convention area is managed by a so-called ‘Political Committee’ that is composed of two elected representatives per municipality (usually the mayor and an alderman/alderwoman) and the Minister responsible for Spatial Planning. This Political Committee defines the political priorities of the convention and approves the annual work programme. The discussions and decisions at the political level are generally prepared by a ‘Technical Board’ that is composed of the municipal officers responsible for urban planning and policy experts from the Department of Spatial Planning and Development and, depending on the subject, other ministries. The day-to-day business and the follow-up of projects is, in some cases, managed by a Coordination Unit. Convention areas are not recognised as an official territorial unit and there is no formal delegation of competences to the Coordination Units.

Required resources

Conventions of territorial cooperation establish an organisational structure and a financial framework for the duration of the agreement. The allocated budget may vary depending on the willingness of partners to contribute and on the resources required to resolve a specific issue. The Department of Spatial Planning and Development financially contributes to the budget of each convention area, with the rest of the budget coming from the municipalities.


Conventions are an instrument allowing to bridge decision-making levels. Conventions are often a first step to initiate territorial cooperation to work on an identified issue and lead to more institutionalised forms, such as municipal syndicates. Therefore, as of 2021, there’s only one active convention remaining:

  • CIPU is a convention between the Ministry of Energy and Spatial Planning, the Ministry of Housing and the municipalities of Luxembourg, Esch-sur-Alzette, Dudelange and as of 2022, the municipality of Differdange. The convention acts as a platform for exchange on urban policies for the partners and other municipal, national and European actors. The first convention was established in 2010 and the second one became effective in 2016 and will be extended in 2022.

The following conventions have lead to more institutionalised forms of cooperation:

  • the Nordstad convention has set the political basis for developing the Nordstad, a new urban region in the North. Members include the municipalities of Bettendorf, Colmar-Berg, Diekirch, Erpeldange-sur-Sûre, Ettelbrück, Schieren and the Ministry of Energy and Spatial Planning. In 2006, the first convention was signed, which was active until 2014. The second period of the convention covers the period from 2014 until 2019. In 2019, the convention led to the foundation of the inter-municipal Nordstad syndicate, organising the municipal services of the future Northern agglomeration.
  • the objective of the PRO-SUD convention was to promote the development of the South region, which is composed of eleven municipalities in the southern part of the country. The first convention for an integrated territorial development was signed in 2015 and expired in 2020, leading to the foundation of the PRO-SUD syndicate.

More conventions existed but did not lead to fixed forms of cooperation:

  • DICI was a convention that addressed inter-municipal spatial planning and development in the South-West region around Luxembourg-City. Members included the municipalities of Luxembourg, Bertrange, Hesperange, Leudelange, Strassen and the Ministry of Energy and Spatial Planning. The first convention was signed in 2005 and the second one in 2010, the latter of which ran until the end of 2018. The convention was not extended after 13 years of inter-municipal cooperation.
  • Air Regioun was a convention between the State and municipalities East of Luxembourg City. Its objective was to weaken the expected territorial development pressure of a fastly growing Luxembourg City and to coordinate economic development in the region. It was active from 2008 to 2013.
  • Convention Uelzechtdall between the State and the five municipalities north of Luxembourg City Lintgen, Lorentzweiler, Mersch, Steinsel and Walferdange was a convention active between 2007 and 2017. Its aim was to coordinate territorial development by streamlining municipal land-use plans.

Experiences, success factors, risks

The main factor in the conclusion of conventions is the political willingness to cooperate. Moreover, continued political commitment is necessary to sustain the cooperation and to implement projects. As the basis for political commitment, a shared understanding of common challenges and opportunities at the political level is required.

An important incentive for the municipalities to participate is the enhanced cooperation with the State as well as the implementation of joint projects. In terms of regional planning, the municipalities do not delegate planning competences to the Coordination Unit. Nonetheless, there is coordinated planning and development in some fields. This degree of coordination varies from one convention area to another with different coordination mechanisms and procedures. This leads to a differentiated pattern of results. All conventions have non-binding spatial development concepts. The Nordstad convention area, for instance, has a so-called Masterplan.

This form of cooperation fosters communication and builds trust among partners. In most cases, State and municipal actors use conventions to structure coordination mechanisms.


Due to their flexibility, conventions can be used to tackle problems in a unique way. The implication of national authorities helps to ensure funding where the municipal contribution is not sufficient, but the State can also act as a moderator or mediator. The national authorities are actively supporting the establishment of conventions. It is also important to provide the Coordination Unit, charged with the management of day-to-day business, with enough competences to successfully implement and carry out projects. Political willingness and commitment are necessary to sustain the cooperation and to implement projects.


Ms Myriam Bentz, Ministry of Energy and Spatial Planning:

Multi-level governanceTerritorial cooperationUrban development