• The city of Lille intends to use the Dutch “EnergieSprong” system for the thermal renovation of many municipal buildings by the end of the mandate.

  • This exterior insulation process makes it possible to install facades prefabricated in the factory.

  • In 2023, two schools and a sports hall will be rehabilitated in an “EnergieSprong” style.

We can translate in French by "energy jump".

France is gradually discovering the Dutch thermal insulation process "EnergieSprong": an industrialized method of renovating buildings from the outside, from the Netherlands.

The city of Lille, where thermal strainers are legion, is going to get started and wants to add an ecological aspect.

The principle is quite simple: install facades prefabricated in the factory on the existing one.

A sort of ultra-efficient “insulating jacket” that encompasses the entire building to avoid thermal bridges.

For buildings of the same structure, this process makes it possible to shorten construction times and, on a large scale, can lead to budget savings.

About 40 buildings renovated by the end of the mandate?

These arguments, the city of Lille heard them.

In 2023, two schools and a sports hall will be rehabilitated in an “EnergieSprong” style.

And by the end of the mandate, in 2026, around 40 municipal buildings could follow the same path.

"This thermal renovation process may be suitable for us because, among our 550 municipal buildings, many are built on the same grid dating from the 1960s. We are studying the feasibility", assures Audrey Linkenheld, assistant for the ecological transition at the town hall of Lille.

Because the regulations concerning the energy transition normally oblige local authorities to take up the issue of the insulation of real estate assets in order to respect the European objective of climate neutrality until 2050. Audrey Linkenheld has made the account: “C ' is a colossal program that awaits us.

In Lille, the building renovation budget should, in absolute terms, cost between 9 and 12 million euros per year, for thirty years.

Until the end of the mandate, a budget of around 50 million euros has already been anticipated ”.

A sector in the process of being structured

A godsend for the energy transition design office, Alterea. Lille engineers rely heavily on “EnergieSprong”. “In the Netherlands, more than 5,600 dwellings, mainly single-family homes, have been renovated using this process over the past ten years. In France, the dynamic was set in motion in 2016. It is therefore a sector in the process of being structured, ”emphasizes Joaquim Ventura, sales engineer at Alterea.

Several pilot projects have been completed, such as the renovation of 12 individual housing units in Longueau, in the Somme.

Others, with a larger volume of housing, are underway, such as the rehabilitation project for 32 Vilogia collective housing in Roubaix.

“The idea here is to insulate a building from the outside with prefabricated elements made up of a light metal frame and rock wool,” explains Joaquim Ventura.

Zero energy balance

Still in Hauts-de-France, but also in Pays-de-la-Loire, a group of donors has undertaken a collective approach for a “massification of energy rehabilitation”.

The advantage of these potential thermal renovation programs is that they promise zero energy balance, meaning that the home produces as much energy as it consumes.

And this for thirty years guaranteed.

There remains one last obstacle to overcome: the approval of the Architects of Buildings of France.

"Some municipal buildings are classified as remarkable heritage," admits Lille deputy Audrey Linkenheld.

So difficult to rehabilitate from the outside.

"

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