The Grand Duchy of Luxembourg, at the heart of Europe, continues to gain about 2% in population every year. The South of the country, the former industrial area, is growing especially rapidly, by a quarter since 2010 and in 2021 it hosted a third of all residents. Demand for housing has increased and is one of the most rapidly increasing expenses for Luxembourg households today.

In the already urbanised South, many large-scale development projects for new districts on industrial brownfields are being realised or are in the pipeline. This impacts the urban morphology of the area. Formerly geographically separated urban districts are now connected. But how can new districts interconnect urban fabrics, let alone urban functions? Differdange, the third largest city in Luxembourg, is home to such a brownfield project, ‘Plateau du Funiculaire’.

Rationale for action

The rapid development of the steel industry in Luxembourg during the 19th and 20th centuries created a unique urban tissue in the South. Housing was built around steel mills, as in other industrial areas. This resulted in large industrial zones being next to urban centres. In some cases, as in Differdange, these industrial zones are ‘wedges’, impermeable barriers that separate districts functionally.

Steel production in Luxembourg has declined over several crises and steel mills have reduced or entirely stopped production. Around 2000, some 25 hectares became available in the centre of Differdange. The ‘Plateau du Funiculaire’ was formerly a landfill for the adjacent steel mill.

Urban development concept of the ‘Plateau du Funiculaire’. The urban district of the development is shown in the upper part of the image with the new shopping centre ‘Opkorn’ in the upper right corner. The park along the Chiers is shown in the bottom half of the image. Source: Dewey+Muller, 2022.

Objective

The Plateau du Funiculaire functionally split several Differdange districts, so plans were drawn up to transform the brownfield site into a new urban district. From 2004, the city has developed urban concepts in cooperation with many local and national players. A new district, providing housing, offices and commercial areas is planned to connect the existing districts of Differdange, Oberkorn and Fousbann.

Some challenges had to be addressed in developing the urban concepts, including pollution of the area due to its use as landfill for the blast furnace. In addition, the river Chiers running through the area was planned to be renaturalised, to provide water retention and flood areas.

Time frame

The first scoping studies were realised as early as 2004. Since then, planning and construction has been ongoing with most of the district being finalised in 2020. Final construction during 2022 will complete the project on the former landfill.

Key players

The key player for developing the new area was the city of Differdange. The urban concept was developed with a Luxembourg planning office as well as an investor.

Looks and feels of the urban design of ‘Plateau du Funiculaire’. Source: LuxEnergy S.A., 2021.

Implementation steps and processes

Following the first plans to develop the district in 2000, initial research in 2004 assessed the landfill pollution. At the same time, the city of Differdange also outlined strategic objectives for the district. In 2005, a planning office proposed the look and feel of the new district as an urban concept. Development started in 2006 when the historic ‘Villa Hadir’, a former reception and administrative building for the blast furnace was refurbished. Plans to implement the urban concept were submitted for building permits.

A brand was created in 2007 to establish an urban identity to market the new district to future inhabitants, businesses and commerce. Work on the infrastructure started in 2009 and the first bricks for the residential buildings were laid in 2011. In the same year, the recreational park was finalised, allowing neighbourhood residents to get to know the new urban district. Around 2019, a late change to the project integrated a multi-functional tower, called ‘Gravity’, increasing the number of planned housing units from 650 to 728.

Required resources

The resources used are not known.

Results

After a bit more than a decade of construction, the new district will be finalised in 2022. Within 10 years, 728 housing units have been created, providing accommodation for more than 1,600 people. The district also features 15 km2 of office and retail area. A school, a section of Luxembourg university, public administrative offices and shops complement the housing so the district is a fully developed urban quarter of Differdange.

A new train station links the area to the national railway network. In addition bus connections as well as bike and pedestrian infrastructure connect the district both internally and to the surrounding areas.

To minimise soil sealing, ‘Plateau du Funiculaire’ is high density. Nevertheless, some polluted parts of the former landfill were sealed with an artificial layer of clay so surface rainwater can drain into the nearby river. Rainwater that penetrates polluted soil layers is collected separately for treatment.

Residential blocks in the ‘Plateau du Funiculaire’ district. Source: LuxEnergy S.A., 2021.

Experiences, success factors, risks

The relatively short construction period of ‘Plateau du Funiculaire’ highlights good preparation. Potential obstacles were identified, and solutions developed to avoid these.

The urban concepts and building permits provided planning security. The late modification to include a multi-functional tower in the district shows the project adapted to changing demands. Such flexibility is important as needs and requirements usually change for decade-long large-scale urban development projects.

Conclusions

‘Plateau du Funiculaire’ is a prime example of a successful large-scale brownfield development project. Such projects can close functional gaps between urban districts, offering new housing and commerce. In addition, interests from multiple public and private stakeholders can be addressed in one go. It also shows innovative approaches to issues like polluted soils that are frequently encountered in brownfield developments.

‘Plateau du Funiculaire’ also underlines that brownfield development offers much more freedom compared to developments in existing urban areas. Measures can be discussed before being realised in detail, helping to avoid conflicts.

In addition, brownfield development projects such as ‘Plateau du Funiculaire’ are testbeds for new approaches and technologies. The size of the district meant that planners faced challenges that could not be solved with existing planning approaches. An example is heating for the residential units where a centralised district heating system was planned as early as 2007 to reduce infrastructure costs and save energy.

Today the district offers a new face for Differdange and combines different urban functions in an optimal way. With multiple housing and commercial possibilities, ‘Plateau du Funiculaire’ will eventually become the new centre for the town.

Contacts

Urban technical service of Differdange: pag@differdange.lu

References

Dewey Muller, 2018: Plateau du Funiculaire project presentation (German): https://www.deweymuller.com/projekte/plateau-du-funiculaire/

Aurea Differdange, 2020: Project developer website (in French): https://www.aurea-differdange.lu/fr/localisation

How to enable sustainable urban commercial development in inner cities? How to cope with commercial concurrence between city centres and greenfield shopping centres? How to deal with commercial vacancies? What instruments and tools are there that decision-makers can use?

On Friday, 17. September 2021, CIPU organised an excursion to two Luxembourg cities to address these questions. During an afternoon, around 30 planners and experts from various cities and municipalities across the country learned about the approaches, among others of Differdange, the third biggest city of Luxembourg with 26.000 inhabitants.

The second half of the excursion led to Differdange

Differdange is a city built around a steel mill, featuring several centres that are geographically disconnected. The city has doubled in population during the past 15 years. This made it necessary to upscale urban services and to re-design the city centre. Much of the inner-city offer is still influenced by the consumer habits of steel workers: in footfall of the steel mills, restaurants, cafés, and bars dominate the urban environment, only few shops have been established in the inner city. With the steel mill slowly loosing importance for the urban economic activities, a transition of the urban commercial offer is taking place.

Planners in discussion in front of the new shopping centre, called ‘Op Korn’. Source: Zeyen+Baumann.

To support the re-orientation of the urban offer and to link the geographically disconnected centres, a new district has been developed. At the intersection of two major roads on a former landfill of an adjacent steel mill, the new district ‘Plateau Funiculaire’ links the different districts by providing different amenities and new functions.

The new district has been built around a large shopping centre, that has been strategically placed opposite of the still-running steel mill, at a transport axis through the city. With the development, the place presents the new centre of attraction in Differdange, offering shops, offices, and apartments for new and old inhabitants.

The transition of the urban commercial offer has led to an increasing number of commercial vacancies during the last 20 years. Despite the cities’ smaller size, the challenges Differdange faces are of similar nature to those of Esch-sur-Alzette (see Blog post on the first half of the CIPU Excursion). Both cities suffer from a decreasing inner city attractiveness due to high numbers of vacancies.  

Instead of initiating a proprietary instrument, the municipality of Differdange has purchased two shop surfaces in the city centre and leases them to shop owners or new entrepreneurs. In doing so, the city does not rely on pre-definded procedures and rulings. Instead, it asks interested shop owners and entrepreneurs to develop applications, in which business ideas and shop concepts are described. The dossier is submitted to a selection committee. This committee consists of one representative of all political parties (also those that are not involved in municipal government), and of three citizens. A mix in gender, occupation and length of residency is respected.

Showcase offer of the shop selling gifts and goodies founded by a Syrian refugee. Source: Zeyen+Baumann.

The number of applications the municipality received exceeds the number of available shop surfaces. The two best concepts have been chosen, leading to two new shops being created in the municipality. One of them complements the urban commercial landscape with products for babies to young parents and the other sells gifts and goodies. The second shop was found by a Syrian refugee, who has been welcomed in Differdange during 2020. The shops benefit from marketing support of the public city channels.

More commercial surfaces of different kind (shops, bars, restaurants, etc.) will become available in near future. With the experiences collected, the municipality wants to continue efforts to revitalise the city-centre. For this, more commercial surfaces will be purchased in future and more specialised concepts matching concrete citizen requirements will be realised. This will help to address the issue of commercial vacancies with a versatile and pro-active instrument.

The Differdange City Manager explaining the unique approach to combat commercial vacancies. Source: Zeyen+Baumann.

For more information, visit www.diffmix.lu, which is the citizen involvement platform of the municipality (available in English, French and German) and the municipal website of the city of Differdange: www.differdange.lu

For more information or for comments, please contact the author of this article: sebastian.hans@spatialforesight.eu